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foundry sand testing equipment operating instructions (afs) ridsdale

1. Unless the specimen is required for green permeability or shatter index tests strip from the tube by inverting over the stripping post and pushing tube gently downwards When ramming sands which are very weak in the green state use a split specimen tube in place of the standard precision tube After ramming remove the bottom cup place on a flat drying plate and loosen the clamps The specimen is left on the plate by lightly tapping and removing the two halves of the tube without deforming the specimen MAINTENANCE Keep the machine clean and free from loose sands Moving parts should be lubricated with light oil at regular intervals Lightly grease the underside of the sliding weight to minimise wear on the cam RECOMMENDED SPARES Part No Description LSR 25B Rammer plunger head 311 Pedestal cup 313 Precision specimen tube 314 Stripping post 340 Securing screw Split specimen tube 341 Drying plate Split specimen tube 391 Swab Tube conditioner 40 RIDSDALE DIETERT DENSITY INDICATOR AFS GENERAL PRINCIPLES This accessory for the AFS Sand Rammer provides a rapid method of determining the weight in pounds per cubic foot of moulding or core sand mixes The correct weight of sand to form an AFS standard 2 inch diameter x 2 inch height specimen can also be readily obtained by using the Density Indicator DESCRIPTION The Density Indicator is designed to be mounted on top of the Sand Rammer The position of the
2. Before this can be achieved certain basic procedures and techniques must be adopted and followed Some of these important points are listed below for your guidance l SAMPLING a b Always try to obtain a generous representative sample of the sand to be tested Keep in an air tight container to prevent loss of moisture Il SPECIMEN PREPARATION a b c e f g When preparing a number of specimens from the same sample replace the lid of the container after weighing out each specimen Carefully level out the sand surface in the specimen tube before placing under the plunger of the Standard Rammer Never use sand which has already been rammed up once to form a specimen Always ensure that the height of a specimen is correct that is within the tolerance specified Reject any specimen which shows any sign of damage Green sands should be tested immediately dried or baked sands as soon as they have cooled in a desiccator and with cured sands the length of time between curing and testing should be stated when reporting results Any deviation from standard ramming practice should be reported with results Ili SPECIMEN TESTING a b c d Handle specimens carefully Always test three specimens and report the average result For research work never use the same specimen for two different tests ie Permeability and Compression Tests Always follow the instructions with regard to rate
3. RECOMMENDED SPARES Part No 403 406 409 410 411 412 413 417 422 424 425 448 449 450 451 452 Description Adjusting screw pusher arm Levelling screw main frame Gear rack main frame Scale main frame Magnetic rider scale main frame Pusher plate weight Rubber bumper pusher arm Drive pinion gear box pusher arm Compression heads pusher arm weight Rack pinion gear box pusher arm Reduction gear gear box pusher arm Micro switch limit stop and reverse 8 pin socket outlet and harness 8 pin plug and harness Control box assembly and harness Adjusting screw stop bracket 90 RIDSDALE DIETERT HIGH DRY STRENGTH ACCESSORY FOR USSM AFS l GENERAL PRINCIPLES This accessory for the Universal Sand Strength Machine increases the Dry Compression and the Dry Shear capacities of the machine by a factor of 3 ll DESCRIPTION This unit consists of two specially shaped arms which are hinged at one end by means of a shaft mounted in ball bearings The aluminium arm bolts onto the pusher arm of the Universal Sand Strength Machine Compression heads which hold the sand specimen fit between the arms and load is applied to the specimen by means of a ball point in the top lug of the pendulum weight which bears onto a hardened steel pad on the end of the moving arm 91 RIDSDALE DIETERT HIGH DRY STRENGTH ACCESSORYFOR USSM AFS cont d ll INSTALLATION
4. l GENERAL PRINCIPLES This accessory provides a means of applying a transverse load to an AFS 1 inch x 4 inches x inch transverse specimen of baked or cured core sand Il DESCRIPTION The cast aluminium support arms are fitted with hardened steel knife edges two self aligning knife edges which may be adjusted to give 2 inch or 3 inch centres The right hand arm has one fixed knife edge which has been extended to allow for the inch specimen 97 RIDSDALE DIETERT TRANSVERSE SHELL STRENGTH ACCESSORY FOR USSM AFS cont d ll TEST PROCEDURE a Attach the support arm with the two knife edges to the pusher arm and the arm with the single knife edge to the pendulum weight of the Universal Sand Strength Machine by means of the bolts and washers provided NOTE Hand Operated USSM for hand operated universal machine when fitting the transverse core strength and transverse shell strength accessory the 1 bolt will be substituted with a 174 bolt Motorised USSM Secure the left hand part of the accessory with a 17 long x BSW bolt plus collar in the top position and a 1 x BSW bolt with a flat washer in the bottom position The right hand part of the accessory will be secured with a x BSW bolt with a stepped collar in top and bottom positions b Place the specimen on the supports of the testing machine so that the smooth side of the specimen rests on the two bearing knives and the single loa
5. C Scale High Strength Testing Machine HSTM Tensile Core Strength Accessory for HSTM Transverse Core Strength Accessory for HSTM Impact Penetration Tester Laboratory Core Baking Oven Laboratory Core Test Piece Blower Laboratory Mill Laboratory Sand Mixer Laboratory Sand Rammer Type N LSR Compactability Accessory for LSR CO Gassing Accessories for LSR Density Indicator for LSR Flowability Indicator for LSR Ramming Block for LSR Split Specimen Tube for LSR Tensile Ramming Accessory for LSR Transverse Ramming Accessory for LSR Methylene Blue Clay Tester Moistbalance Moisture Teller Mould Permeability Accessory Mould Strength Tester Peel Back Tester Permeability Meter Rapid Sand Washer Sand Specific Surface Tester Shatter Index Tester Shell Mould Tensile Accessory Shell Mould Transverse Accessory Silica Sand Sampler Sliding Weight Scales Ultrasonic Clay Tester Accessory Universal Sand Strength Machine USSM Hand Operated Universal Sand Strength Machine USSM Motor Driven High Dry Strength Accessory for USSM Shear Strength Accessory for USSM Splitting Strength Accessory for USSM Tensile Core Strength Accessory for USSM Transverse Core Strength Accessory for USSM Transverse Shell Strength Accessory for USSM PREFACE This instruction book has been compiled to assist the Foundry Technician in obtaining the maximum benefits from his Ridsdale Dietert equipment
6. a b Insert the two spigots of the High Dry Strength Accessory into the top and bottom holes on the pusher arm of the Universal Sand Strength Machine and secure in position with the bolts and washers supplied NOTE Hand Operated Universal secure with one x inch BSW x 1 inch long bolt and stepped collar and a 172 BSW bolt and flat washer Motorised Universal secure with inch BSW x 1 inch long bolt and stepped collar in top position and 1 4 inch BSW x 2 inch long bolt and plain washer in lower position Place the ball point in the hole in the top lug of the pendulum weight and ensure that it bears directly on the hardened steel pad on the end of the moving arm IV TEST PROCEDURE a b c d e Place a prepared metric standard 2 inch diameter x 2 inch height test specimen between the compression heads as in the diagram Adjust screw to give the pendulum weight at least 1 inch clearance from the rubber bumper on the pusher arm Check that the ball point is still bearing on the hardened steel paid Position the magnetic rider on the scale and apply the load in the recommended manner until the specimen collapses Read the Dry Compression scale and multiply by 3 to obtain load in Ib in RECOMMENDED SPARES Part No Description 1804 Ball Point 403 Adjusting Screw 1808 Stepped Collar BSW is British Standard Whitworth thread 92 RIDSDALE DIETERT TENSILE CORE STRENGTH ACC
7. b Holding the tester at right angles to the mould surface press the probe slowly into the sand The force applied should be only enough to keep the probe just moving into the surface 129 RIDSDALE DIETERT MOULD STRENGTH TESTER AFS cont d TEST PROCEDURE cont d c Stop applying pressure when the graduation on the probe is level with the mould surface The green compression strength of the mould is indicated by the maximum reading slave pointer NOTE Since this test is subject to an operator variable it is suggested that the operator make practice tests on an AFS 2 inch diameter x 2 inch length test specimen resting on the stripping post before it is stripped from the specimen tube Other specimens of the same sand can be tested with the Green Compression Strength Machine or the Universal Sand Strength Testing Machine so that the operator can observe the desired loading rate and have reference values for evaluating his test procedure 130 GENERAL PRINCIPLES The instrument is used to determine the specific gravity of all types of foundry washes sprays and coating materials which are heavier than water DESCRIPTION The hydrometer consists of a transparent plastic tubing RIDSDALE DIETERT FOUNDRY HYDROMETER 0 90 Baum which is resistant to organic solvents and has a specially designed stainless steel tip for stability TEST PROCEDURE a b c d e f h Check the h
8. done they must be carefully reset and precautions taken as laid down in installation instructions before switching on the motor RECOMMENDED SPARES Part No Description 1101 Gland Plate Drive Shaft 1102 O Ring Seal Gland Plate 1103 Joint Gland Plate 1114 Thrust Washer Crosshead 1115 Thrust Washer Wormwheel 1132 Support Arm Large Scraper 1133 Large Scraper 1134 Small Scraper 1145 Wormwheel 48T Pitch No 3980 1146 Worm Pitch x Lead 6102 K8 26 RIDSDALE LABORATORY SAND MIXER GENERAL PRINCIPLES This mixer is designed for making small scale mixes of oil resin and silicate bonded sands in the laboratory Specially shaped rotating blades and fixed breakers on the side of the pan churn up the mixture to give rapid efficient blending DESCRIPTION This mixer consists of a 4 hp geared electric motor which drives two curved blades inside a fixed pan A built in 0 15 minute time switch controls the mixing operation and the mixer is emptied by means of a pull out bottom discharge door The complete blade assembly can be removed readily to facilitate cleaning as it is only held in position in the drive shaft by its own weight SAFETY NOTE A CUT OUT SWITCH IS CONNECTED TO THE SAFETY GRILL VIA THE SWITCH ARM TO PREVENT OPERATION OF THE MOTOR WHEN THE GRILL IS LIFTED THE DISCHARGE SHUTE IS GUARDED AGAINST ACCESS TO INTERIOR OF MIXER 27 RIDSDALE LABORATORY SAND MIXER cont
9. sq cm Orifice Orifice sq cm Orifice Orifice 0 5 mm 1 5mm 0 5mm 1 5mm 0 1 5 1 14 3 134 0 2 5 2 13 8 128 0 3 est 5 3 13 4 126 0 4 2450 5 4 13 0 122 0 5 2000 5 5 12 6 119 0 6 1620 5 6 12 2 115 0 7 1350 5 7 11 8 112 0 8 1200 5 8 11 4 108 0 9 1060 5 9 11 0 105 1 0 950 6 0 10 7 102 1 1 850 6 1 10 3 99 1 2 780 6 2 10 0 96 1 3 710 6 3 9 7 93 1 4 650 6 4 9 4 90 1 5 610 6 5 9 0 88 1 6 550 6 6 8 8 85 1 7 525 6 7 8 5 82 1 8 492 6 8 8 2 80 1 9 er 467 6 9 7 9 77 2 0 49 440 7 0 7 7 75 2 1 47 417 7 1 7 5 73 2 2 44 398 7 2 7 2 70 2 3 42 376 7 3 7 0 67 2 4 40 358 7 4 6 7 65 2 5 38 341 7 5 6 5 63 2 6 36 326 7 6 6 3 61 2 7 34 313 T T 6 0 58 2 8 33 300 7 8 5 8 56 2 9 31 287 7 9 5 6 54 3 0 30 275 8 0 5 3 52 3 1 29 264 8 1 5 1 50 3 2 28 253 8 2 4 9 48 3 3 27 243 8 3 4 7 46 3 4 25 8 235 8 4 4 4 44 3 5 24 2 226 8 5 4 2 42 3 6 23 4 219 8 6 4 0 40 3 7 22 7 212 8 7 3 7 38 3 8 21 8 205 8 8 3 5 36 3 9 21 0 198 8 9 3 3 4 0 20 0 193 9 0 3 1 4 1 19 5 185 9 1 2 9 4 2 19 0 178 9 2 2 6 4 3 18 4 173 9 3 2 4 4 4 17 8 167 9 4 2 2 4 5 17 3 163 9 5 1 9 4 6 16 7 156 9 6 1 7 4 7 16 2 151 9 7 1 4 4 8 15 7 146 9 8 1 1 4 9 15 2 142 10 0 5 0 14 7 138 68 RIDSDALE DIETERT ELECTRIC PERMMETER GENERAL PRINCIPLES This Permeability Meter employs the orifice method for the rapid determination of sand permeability Air at a constant pressure is applied to a standard test specimen in a specimen tube and the drop in pressure is measured on a
10. Glass Wash Beaker Syphon Tube amp Clip Rubber O ring in stand Rubber washer in stand Carbon brushes for motor Time switch Control box switch Alarm buzzer Cleaning brush NB The nominal speed of the electric motor used for the stirrer unit specified by the motor manufacturers is 4500 rpm However speeds in excess of this may be attained by some motors and hence a direct comparison between performances of different Rapid Sand Washers may not always be possible RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY GENERAL PRINCIPLES The Methylene Blue MB Clay Tester measures the amount of live clay present by determining the base exchange capacity of the clay The use of tetrasodium pyrophosphate as a preliminary solution enables a similar response to methylene blue of both western and southern bentonites and hence the MB Clay Tester makes possible the rapid and accurate determination of live clay in foundry sand systems employing western or southern bentonites or any combination of the two It can also be used to determine systems using fireclay The Ultrasonic Accessory breaks down the clay aggregates and enables all the live clay to react with the methylene blue This enables the total live clay to be determined with the MB Clay Tester Also the Ultrasonic Accessory can be used in conjunction with the MB Clay Tester to check incoming clay bentonite shipments DESCRIPTION The composite parts of
11. PRINCIPLES This accessory for the Hand Operated Universal Sand Strength Machine USSM provides a means of determining the splitting strength of an AFS Standard 2 inch diameter x 2 inch height test specimen which is a measure of its resistance to breaking under a compression load applied perpendicular to the circumference of the specimen DESCRIPTION The Splitting Strength Accessory consists of two test heads one of which has a swivel arm attached for the purpose of locating the test specimen prior to applying load INSTALLATION Attach the test head with arm attached to the weight arm of the USSM and the other test head to the pusher arm of the USSM TEST PROCEDURE Place the AFS Standard 2 inch diameter x 2 inch height test specimen between the test heads with the arm in position to locate the specimen in such a way that load will be applied perpendicular to its circumference Slightly pre load the specimen sufficient to retain it in position then swing the arm clear and apply load in the recommended manner see Operating Instructions for USSM until the specimen collapses The splitting strength is read directly in psi from the Green Shear scale of the USSM 103 RIDSDALE SPLITTING STRENGTH ACCESSORY AFS for use with the Green Compression Strength Machine GENERAL PRINCIPLES This accessory for the Green Compression Strength Machine GCSM provides a means of determining the splitting strength of an AFS Standard 2 inc
12. This is controlled by a screw in the top left hand corner of the case flange which is visible when the door is open A screwdriver is needed for adjusting the position This is to discourage unauthorised or unwitting adjustments Turn clockwise to raise the pen and anti clockwise to lower the pen 117 RIDSDALE GAS DETERMINATOR cont d b Chart Recorder cont d MANUFACTURERS ARKON INSTRUMENTS LTD T E M E 2A THE CROFT CROFT STREET LECKHAMPTON GLOS GL53 OED Tele 01242 228745 c Temperature Controller See Eurotherm Operating Manual TEST PROCEDURE TURN on the cooling water and switch on the furnace SET the temperature controller to the required temperature 850 C and allow the furnace to attain equilibrium at this temperature INTRODUCE a weighed quantity 1 2 g of sand into one of the special thin walled copper sample tubes 3 in long x in diameter closed at one end and plug the open end with ignited aluminium silicate fiberfax UNSCREW the spring gun assembly and insert the sample tube with the gun in the loaded position REPLACE the gun assembly and pass a stream of oxygen free nitrogen through the apparatus at a rate of about 1 litre per minute with the GAS INLET and EXHAUST taps in the open position and the RECORDER tap shut After two minutes all oxygen or gases from a previous test should have been expelled SHUT OFF the supply of nitrogen then a Turn GAS IN
13. a pair of COLD split moulds in position on the heated base plates Spray all surfaces coming into contact with the sand mixture with a silicone mould release agent Rest the strike off edge of the hopper strike off assembly against the edge of the open cavities of the pattern and dump the sand into the cavities in one swift motion 99 RIDSDALE DIETERT SHELL MOULD TRANSVERSE ACCESSORY AFS cont d ll TEST PROCEDURE cont d WITHOUT DELAY f Place the strike off edge along the longitudinal centre line of the mould and holding it perpendicular to the mould surface strike off the excess sand from the centre line outwards first from one side then the other g Place the filled mould in a suitable oven or enclosed stove for the appropriate time h Remove the specimens from the mould and allow to cool to room temperature Check the thickness 1 4 inch of the specimens before testing i The specimens can be tested on the Universal Sand Strength Machine using the Transverse Shell Strength Accessory Read the Dry Shear scale and multiply by 4 to give load supported by specimen in psi ii The swivel knife edges in the Transverse Shell Strength Accessory can be adjusted to give loadings at 2 inch or 3 inch centres and the fixed knife edge is extended to allow for the thinner specimens NOTE It is important to remove the surplus resin bonded sand before sufficient heat has penetrated through the split moulds to
14. and check the length of the syphon tube by moving the clip so that the curved end of the tube is 25 mm above the bottom of the beaker Remove the tube from the beaker TEST PROCEDURE a b c e f h i i k 1 m Take a representative sample of moist sand weighing approximately 50 g Dry the sample weigh accurately and place in the wash beaker Add 475 ml distilled water at room temperature and 25 ml of 1 5 w v tetrasodium pyrophosphate solution now recommended by the AFS as a deflocculant instead of sodium hydroxide which has a tendency to cause gelling problems preventing sand grains from settling properly Place the stirrer unit in the wash beaker Check that the Continuous switch on the control box is off and switch the Mains switch on Set the agitation period to 5 minutes by rotating the time switch to its maximum position and then back to the figure 5 When the 5 minute period has elapsed and the motor stops disconnect from the control box Remove the stirrer unit from the beaker wash any sand grains which may adhere to the vertical baffles or agitator back into the beaker with distilled water Fill the beaker with distilled water to the top line in such a manner that the contents are well stirred Remove the beaker from the stand Set the settling time on the control box at 10 minutes and switch the buzzer switch on When the alarm indicates that the first 10
15. and hence possible damage Readings are empirical and bear no direct relationship to any definite pressure per unit area They are however valuable for comparative purposes For moulds with surface hardness values in excess of 85 B Scale eg moulds produced by high pressure moulding methods a Green Hardness Tester C Scale is recommended RELATIONSHIP BETWEEN C SCALE amp B SCALE GREEN HARDNESS TESTERS 90 80 70 60 C SCALE 50 40 30 20 9 eee 10 gers 60 65 70 75 80 85 90 95 100 B SCALE MOULD HARDNESS No B SCALE RELATIONSHIP BETWEEN MOULD HARDNESS SCALES 122 RIDSDALE DIETERT GREEN HARDNESS TESTER C SCALE GENERAL PRINCIPLES This instrument is designed for measuring the surface hardness of green sand moulds where the surface hardness values are in excess of 85 B Scale eg moulds produced by high pressure moulding methods Hardness values of 85 100 B Scale are equivalent to values of 30 85 on the C Scale tester making the instrument more sensitive in the higher ranges of mould hardness The test is similar to the Brinell Hardness Test the softer the mould surface the greater the penetration of the probe into the mould surface The hardness number indicated is the measurement of the depth of penetration of the probe in thousandths of an inch A mould offering no resistance
16. and remove the moisture from the material Allow the pan to cool on Moisture Teller cooling base Replace the pan containing the dried material in position on the balance and rotate the dial until equilibrium is again obtained and the pointer comes to rest on the index mark Read the percentage moisture direct from the dial The full range of the dial from 0 to 20 is equivalent to a loss in weight of 10 g Hence if a 100 g sample is used the dial reading must be divided by 2 or if a 25 g sample is used the dial reading must be multiplied by 2 MAINTENANCE Normal cleanliness is all that is required to maintain the balance in good operating condition RECOMMENDED SPARES Part No Description 01 Compensating Screw 02 Cradle Assembly 34 RIDSDALE SLIDING WEIGHT SCALES Place the Sliding Weight Scales on a level surface free from vibration if possible Adjust the weight on the lower beam to the nearest 10 gram increment required to produce a standard sand specimen If any fine adjustment on weight is required use the weight on the top beam which is graduated in 0 1 gram increments to achieve the correct specimen height Transfer the funnel scoop into the specimen tube brush out any surplus sand and replace the funnel scoop back on the Sliding Weight Scales MAINTENANCE Clean thoroughly after use RECOMMENDED SPARES Brass Funnel Scoop Weight Pan 35 RIDSDALE DIGITAL BALANCE OPERATION AC Adapter Operation CA
17. b c d e Using one of the direction of travel buttons on the cypher reduce the distance between the tensile jaws to accommodate the tensile sand specimen allowing approximately 1 16 inch 1 5 mm clearance Place the specimen between the tensile jaws ensuring that the specimen is resting flat on the back plates replace the perspex safety cover Before commencement of test ensure that the cursor is displayed on the left hand top corner of the cypher display To adjust the cursor repeatedly press the max min button For tensile testing select Mode 4 button on the cypher Zero the display on the cypher using the reset and zero buttons 107 RIDSDALE TENSILE CORE STRENGTH ACCESSORY FOR HIGH STRENGTH TESTING MACHINE cont d ll TEST PROCEDURE cont d f To test press the direction of travel button marked 2 as shown on diagram above If using software package press F4 simultaneously g Once the specimen has broken press the stop button and remove the remains of the previous test piece h Repeat from Procedure a to carry out further tests 108 RIDSDALE TRANSVERSE CORE STRENGTH ACCESSORY FOR HIGH STRENGTH TESTING MACHINE a b c d INSTALLATION Press one of the direction of travel buttons on the cypher to obtain sufficient clearance to insert the transverse core strength accessory Ensure the socket head screws on the support ar
18. cause the surplus sand to coagulate and score the surface of the specimen when strickled off IV MAINTENANCE Remove any adhering sand from former plates after use V RECOMMENDED SPARES Part No Description 1401 RH Former Plate Supplied in pairs only 1402 LH Former Plate 100 RIDSDALE DIETERT SHELL MOULD TENSILE ACCESSORY AFS GENERAL PRINCIPLES The Shell Mould Tensile Accessory AFS is designed to produce an AFS standard tensile specimen from shell moulding materials DESCRIPTION The Shell Mould Tensile Accessory AFS includes a split 3 cavity pattern former plates for making inch thick tensile specimens a hopper strike off assembly and two inserts which should be attached to the support straps at the back of the standard Tensile Core Strength Accessory for testing on the Universal Sand Strength Machine TEST PROCEDURE a Heat the base plate to approximately 200 C in an oven or enclosed stove b Stand the hopper strike off assembly on to its broad edge and fill with pre coated sand mixture so that the mixture in the three pockets is level with the ends c Place a pair of COLD split moulds in position on the heated base plates d Spray all surfaces coming into contact with the sand mixture with a silicone mould release agent e Rest the strike off edge of the hopper strike off assembly against the edge of the open cavities of the pattern and dump the sand into the cavities in one swift moti
19. centre rear If the kerosene gets into the metal tube it will be necessary to drain out the kerosene and start again The kerosene can be removed by unscrewing the drain screw in the drain elbow 25 Using the rubber squeeze bulb the liquid level in the volumetric tube should be raised above the upper black marking When the liquid level is high enough move the valve handle to the HOLD position This will prevent the liquid level from rising or falling until the operator is ready for the final adjustment Carefully move the pointer on the valve handle to the right of the HOLD position until the liquid level in the volumetric tube begins to fall slowly When the liquid level reaches the upper black marking move the valve handle to the HOLD position again The instrument will then be in position for the first test Move the valve handle to the TEST position and as soon as the liquid level reaches the upper red marking start a stopwatch With the valve handle in the TEST position the volumetric tube is connected to the burette through the metal tube Air is drawn through the sand sample and the liquid level will fall in the volumetric tube When the liquid level reaches the lower red marking stop the stopwatch and record the time required for the standard volume of air to pass through the specimen Knowing the sand volume in cm and time taken for the air to pass through in seconds the specific surface area Sy
20. d VI INSTALLATION a b c Stand the mixer on a convenient bench Connect to power supply see rating plate for correct current and voltage by fitting the moulded plug and 2 metre lead which are supplied Make sure the blade assembly is properly located on the drive shaft and seated onto the mixer base Check the operation by switching on the power supply and rotating the time switch clockwise OPERATING PROCEDURE a b c d e f g Check that the mixer door is closed properly Put 1 2 kg of sand plus any dry additions into the mixer and mix dry for 1 minute Make any liquid additions water resin silicate etc gradually with the mixer running Set the time switch for the required time 3 5 minutes is usually required for synthetic moulding or core sands and allow to time out Empty by pulling out the door with the motor running Allow the mixer to empty itself as far as possible and stop the motor by turning the time switch anti clockwise Switch off the power supply to the unit Remove any loose sand from the blades and breakers with a stiff brush Lift out the blade assembly and clean thoroughly Remove any sand grains adhering to the discharge door and guides MAINTENANCE Clean thoroughly after use RECOMMENDED SPARES Part No Description 1200 Blade carrier head 1201 Large blade blade carrier head 1202 Small blade blade carrier head 1207 Safety sw
21. event of the machine coming to rest away from the zero position this can be rectified by slackening the knurled check nut on the stop bracket and screwing the adjustable stop in or out as required 87 RIDSDALE DIETERT MOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE AFS cont d IV TEST PROCEDURE A Green Compression Strength B a b c d e f Place the compression heads in the position shown on the illustration Raise the weight arm slightly and insert an AFS standard 2 inch diameter x 2 inch height test specimen between the compression heads so that the face that was uppermost in the ramming operation is facing the right hand compression head Care should be taken not to damage the specimen See that the magnetic rider is resting against the pusher plate and that there is at least 0 25 inch clearance between the rubber bumper and the lug on the weight arm If this clearance is not sufficient it means that the specimen is smaller than the permitted tolerance and should be discarded Press the START button When the specimen collapses the machine will reverse and return to zero automatically Record the reading shown on the lower edge of the magnetic rider reading the scale designated Green Compression Strength Remove the sand from the compression heads Green Shear Strength a b c Place the shear test heads in the lower position in the machine with the head having the
22. half round holder attached to it in the pusher arm Raise the weight arm slightly and insert an AFS standard 2 inch diameter x 2 inch height specimen between the heads Ensure that the magnetic rider is resting against the pusher arm and that there is 0 25 inch clearance between the rubber bumper and the lug on the weight arm Press the START button When the specimen shears the machine will reverse and return to zero automatically Read the lower edge of the magnetic rider on the scale designated Green Shear Remove the sand from the shear heads 88 RIDSDALE DIETERT IV MOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE AFS cont d TEST PROCEDURE cont d C Dry Compression and Dry Shear Strength a Place either the compression heads or the shear heads in the top position of the machine This position increases the load applied by a factor of 5 b Prepare AFS standard 2 inch diameter x 2 inch height test specimens in the usual way and dry in an oven at 110 C for 2 hours c When cool place in position between test heads and adjust clearance between rubber bumper and lug on weight arm to approximately 0 5 inch using the adjusting screw in the pusher arm d Press the START button When the specimen collapses the machine will reverse and return to zero automatically e Read the scale designated Dry Compression or Dry Shear according to the test heads being used f Remove the s
23. hand wheel in a clockwise direction until the load begins to the applied to the specimen Turn the handle slowly at the rate of about 30 Ib per minute until the specimen collapses This is achieved most easily by using both hands on the rim of the hand wheel Record the compression strength as indicated by the slave pointer MAINTENANCE Keep the machine clean and the hand wheel shaft lightly oiled Ensure that the lower compression head is free to move and therefore self aligning RECOMMENDED SPARES Part No Description 607 Sand pan 628 0 4 5 psi capacity spring balance 629 0 12 5 psi capacity spring balance 630 0 31 psi capacity spring balance 81 RIDSDALE DIETERT HAND OPERATED UNIVERSAL SAND STRENGTH MACHINE AFS GENERAL PRINCIPLES The Universal Sand Strength Machine together with the appropriate accessories will determine the compression shear tensile transverse and splitting strengths of moulding and core making materials by means of dead weight loading DESCRIPTION This machine consists of three major parts frame pendulum weight and pusher arm The pusher arm is motivated by means of a small handwheel which through a gear box rotates a pinion engaged in a rack on the quadrant The pendulum weight swings on ball bearings and can be moved by the pusher arm via a test specimen from a vertical position through 90 to a horizontal position with a consequent increase of load on the test specimen A m
24. in cm g can be read directly from the accompanying graph Figure 1 The graph Figure 1 is based on a sand specimen with a specific gravity of 2 65 kerosene with a specific gravity of 0 811 and air with a dynamic viscosity of 18110 If material other than sand is tested or if a different levelling liquid is used it will be necessary to determine a correction factor for use with the graph Once Sw is known it is necessary to determine the theoretical specific surface area S n in order to calculate the Coefficient of Angularity which is the ratio of the actual specific surface to the theoretical specific surface 17 RIDSDALE DIETERT SAND SPECIFIC SURFACE TESTER cont d 16 To determine the theoretical specific surface remove the sand sample from the burette and use the same sand for a screen analysis PROCEDURE cont d 17 Place the sand on the top sieve of a stack of BS 410 1986 or DIN 4188 ISO R565 Series Sieves Cover and set the stack in a suitable Sieve Shaker and fasten securely Operate the sieve shaker for 15 minutes 18 Following the instructions supplied with the BS 410 1986 or DIN 4188 ISO R565 series sieves determine the cumulative weight for each sieve 19 By subtraction calculate the weight of sand retained on each sieve Multiply the weight on each sieve by 2 and record as percent retained on each sieve 20 Multiply the percent retained on each sieve by the appropriate theoretical surfa
25. of the rammer or to a chosen mould hardness Move the indicator arm until it rests on the top of the rammer plunger and read the density of the rammed sand in pounds per cubic foot on the left hand scale If the density is less than 88 pounds per cubic foot use a sample weight of 150 grams and proceed as outlined above reading the right hand scale To obtain the weight of sand needed to form an AFS 2 inch diameter specimen weigh out 165 grams of sand ram in the usual manner and read the weight in grams on the centre scale 42 RIDSDALE DIETERT FLOWABILITY INDICATOR AFS GENERAL PRINCIPLES This gauge measures the ability of a sand to flow and fill up mould interstices when subjected to ramming DESCRIPTION The Flowability Indicator is a dial indicator which can be readily attached to the AFS Standard Sand Rammer in such a way that it will measure the amount of movement of the plunger shaft between the fourth and fifth rams on a 2 inch diameter x 2 inch height specimen of moulding sand INSTALLATION a Fit the securing peg on which the Indicator is mounted into the hole on the top of the Rammer frame b Position the Indicator so that with its stem fully extended the ball point is approximately 1 4 inch below the tolerance line O Secure with the set screw at the side of the rammer frame behind the tolerance plate c When the Indicator is not in use it should be rotated out of position so that it does n
26. pointer is controlled by the length of the rammed sand specimen Three scales are engraved on a curved plate two of which indicate density in pounds per cubic foot one reading from 88 to 114 pounds per cubic foot when a 165 gram weight of sand is used and the other reading from 80 to 102 pounds per cubic foot when a 150 gram sample weight is used The third central calibration indicates the exact weight in grams of sand needed to form a 2 inch diameter x 2 inch height specimen after ramming a sand specimen weighing 165 grams INSTALLATION The Density Indicator is secured to the AFS Sand Rammer by means of two screws provided using the two tapped holes on the back of the lug on which the tolerance scale is mounted It is positioned correctly by placing the 2 inch gauge block provided on a pedestal cup and lowering the ram end on to it The main arm and the indicating pointer should then be approximately parallel Final adjustment is made by slackening the three domed nuts behind the scale and moving it until the pointer indicates exactly 2 inches on the scale 41 IV RIDSDALE DIETERT DENSITY INDICATOR AFS cont d TEST PROCEDURE cont d a b c d Weigh out 165 grams of sand and place in a standard 2 inch diameter specimen tube using a pedestal cup Lift the indicator arm to the right so that it comes to rest on the stop bracket and does not interfere with the action of the rammer Ram the sand with three drops
27. pressure gauge which is calibrated directly in permeability numbers DESCRIPTION A high speed blower with a pressure balancing mechanism delivers air to the system at 100 mm water pressure The speed of this blower is controlled by a rheostat on the right hand side of the instrument A three way valve operated by a lever on the left hand side of the instrument allows the air to flow to either the pressure gauge or to the centre post By rotating the centre post an O ring is expanded and forms an air tight seal with a specimen tube The hole in the centre post is threaded to accommodate one of the two calibrated orifices The pressure gauge dial has three separate graduations The inner scale gives air pressure in mm of water and the other two are calibrated directly in permeability numbers one for each orifice Two check jets are supplied with each instrument for checking the calibration 69 RIDSDALE DIETERT ELECTRIC PERMMETER cont d INSTALLATION Place the unit on a rigid level base and connect to appropriate power supply See nameplate for correct voltage and frequency TEST PROCEDURE a Switch on blower motor by moving toggle switch to the ON position Allow the motor to run for at least one minute in order to obtain a stable reading on the gauge b Select the orifice required for the sand sample to be tested The general rule for determining the orifice required is i If the permeability n
28. regularly spaced spots as possible It is recommended to mark identify the sample as well date type supplier place of sampling etc RIDSDALE DIETERT RAPID SAND WASHER Type N GENERAL PRINCIPLES This unit separates the clay particles from the sand grains in a sand by means of rapid agitation The clay grade is held in suspension removed by means of a syphon and is determined by loss in weight DESCRIPTION The sand washer assembly consists of a motor stirrer unit glass wash beaker cleaning brush metal stand syphon tube and control box An extra beaker is provided to enable a second test to be carried out concurrently within the settling and drying periods of the first test The metal stand is designed to accommodate the wash beaker during the agitation period of the test and the syphon tube allows the clay water suspension to be syphoned off after the settling periods without disturbing the sand grains in the beaker The control box provides an essential means of timing and controlling the agitation and settling periods It incorporates an alarm buzzer as well as a facility for by passing the timer and allowing the stirrer to run continuously RIDSDALE DIETERT RAPID SAND WASHER Type N cont d INSTALLATION Connect the control box to an appropriate power supply see name plate on motor for correct voltage and frequency Plug the stirrer unit into the control box Place a wash beaker in position in the metal stand
29. should be checked with a stop watch If the orifice appears to be out of calibration check air system for leaks as in Section III paragraphs e and f and confirm that 10 cm pressure is registered on the manometer If there are no leaks and the pressure is correct clean orifice with clean dry compressed air or a soft wood splint NEVER CLEAN ORIFICES WITH METAL POINT OR WIRE Should the instrument still appear to be out of calibration it is recommended that it be returned to the manufacturers for overhaul 66 RIDSDALE DIETERT PERMEABILITY METER AFS cont d VI RECOMMENDED SPARES Description Air valve three way Priming cock manometer housing Air tube air valve to centre post Plain ferrule manometer tube Screwed ferrule manometer tube Manometer tube c w 2 washers Sealing washer manometer tube Permeability dial Permeability dial complete with bracket Adjusting screw permeability dial Large orifice 30 seconds Small orifice 270 seconds Open orifice Sealing washer orifice Pressure pipe complete with olive and nut Dust cover centre post O ring sealing centre post O ring cushion centre post 67 RIDSDALE DIETERT PERMEABILITY METER AFS cont d PERMEABILITY TEST PRESSURES AND CORRESPONDING VALUES AS OBTAINED WITH STANDARD ORIFICES PERMEABILITY PERMEABILITY Pressure Pressure grams per Small Large grams per Small Large
30. stated frequency with Neutral nominally at Earth potential b Your supply voltage is within the stated range WARNING THIS APPARATUS MUST BE EARTHED The wires in the mains lead are coloured in accordance with the following code Green and Yellow Earth Blue Neutral Brown Live Connect the wires to a non reversible 3 pin plug as follows Green and Yellow wire to terminal marked E Earth G Ground or or coloured green or green and yellow Blue wire to terminal marked N Neutral or Common or coloured Blue Brown wire to terminal marked L Live or Phase or coloured Brown IMPORTANT Consult a qualified electrician if in any doubt or if your supply system has any of the following No Earth A colour code different from the above Reversible Plugs Supply and return leads that are both above earth potential RATE OF STIRRING The speed of the motor remains approximately constant at 1200 rpm with 50 Hz supply over a wide range of loads Should this speed be visibly reduced by overloading employ a smaller rotor or reduce the pitch of the rotor blades otherwise the motor may overheat 13 INSTRUCTIONS FOR THE CORRECT USE OF ULTRASONIC CLAY TESTER ACCESSORY For UK and Continental European Models connect to a 220 240 VAC fully earthed supply via a 3 pin plug It can be dangerous to operate an ultrasonic bath without an earth connected Fill the bath to within 30 mm from the top The unit is designed to opera
31. the air inlet to a supply of compressed air at minimum pressure of 80 psi 6 bars and maximum 250 psi 18 bars The supply pipe should be as short as possible and have adequate bore to minimise the pressure drop during the blowing operation Connect the power plug to a suitable electric power supply INSTRUCTIONS FOR USE Setting Up Die Ready for Use a Check that the magazine is correctly positioned on the blow head b Place the die between the die heater plates and by means of the die positioning screw and clamping screw locate the die centrally beneath the sand magazine and nozzle The positioning screw should be adjusted so that the die is firmly clamped by the side plates when the clamping lever is in a position of 45 C to the bench top c Adjust the backstop so that the magazine nozzle completely covers the die entrance d If the die is to be used HOT release the clamp and reclamp very lightly This action allows for die expansion to take place during heat up e Set the temperature controller to the required temperature The machine is ready for use when the pre set temperature shows on the digital display as described in the Controller s Instructions Filling the Sand Magazine a Raise the magazine by turning the positioning handle so that the weight hangs vertically b Unclip the magazine from the blowing head c Fill the magazine two thirds full with shell moulding sand Do not overfill d Fasten the
32. the loss in weight principle on a 50 g sample There are no loose weights and the operator can rapidly and accurately determine the percentage moisture in materials as a direct reading after drying DESCRIPTION A double beam assembly carrying sliding weights is suspended on precision ground knife edges A bow shaped cradle hangs from one end of the beam assembly and will accommodate the special Moisture Teller drying pans The dial indicator on the front of the balance is calibrated 0 20 moisture when using a 50 g sample INSTALLATION Geometry of the beam system enables balance to function on non level conditions Base is designed to rest on three feet only adjustment needed is zero control at end of beam 33 RIDSDALE MOISTBALANCE cont d IV Vi TEST PROCEDURE a b c d e h Place an empty Moisture Teller pan in position on the pan cradle of the balance Slacken the knurled screw on the back of the rear sliding weight and slide it along the beam until near equilibrium is obtained Secure in position by re tightening the knurled screw Move the knurled nut on the threaded portion on the end of the beam and move until the point on the beam comes to rest on the index mark Move the front sliding weight to the 50 g notch on the beam Load the pan with material to be tested until equilibrium is obtained and the pointer comes to rest on the index mark Transfer the pan to the Moisture Teller
33. to penetration has a zero hardness reading and one which completely resists penetration has a hardness of 100 prer DESCRIPTION The tester has a dial gauge calibrated in thousandths of an inch which is operated by a conical probe The dial bezel can be rotated and the pointer held in any position by pressing the locking button This locking button is used when testing in blind positions of a mould TEST PROCEDURE a Press the Hardness Tester down on to a hard flat surface until the anvil plate which surrounds the probe makes even contact with the surface Slacken the clamping screw and turn the milled bezel until the pointer reads 100 Re clamp the bezel b Press the tester firmly down on to any flat surface of a mould until the anvil plate is in contact with the mould surface The penetration of the probe into the mould surface is registered on the dial and is read direct as Green Hardness C scale 123 RIDSDALE DIETERT GREEN HARDNESS TESTER C SCALE cont d TEST PROCEDURE cont d c d e When testing in places where the dial cannot be seen easily hold the pointer in the test position by pressing the locking button on the front of the tester Remove the instrument from the mould and take the reading The pointer is released ready for the next test by pressing the button on the back of the tester while holding the thumb on the probe to prevent the sudden return of the pointer to zero and hence po
34. units of 5 which fits into the hole on top of the Standard Sand Rammer and a tube filler comprising a 6 35 mm mesh screen and funnel mounted on a cast base A locating hole in the centre of the boss ensures that the specimen tube is positioned directly beneath the funnel outlet A strike off blade is provided for removing excess sand after the specimen tube has been filled 45 RIDSDALE DIETERT COMPACTABILITY TESTER cont d a b c d e NOTE INSTALLATION Place a precision specimen tube and pedestal cup in position on the sand rammer Mount the scale on the top of the rammer frame using the 2 6 35 mm drilled hole Using the weight lifting lever raise the plunger of the rammer until the bottom face of the ram end is level with the top edge of the specimen tube Move the scale up or down until the zero is in line with the top of the plunger shaft Lock the accessory in position by means of the 3 16 Allen screw located on the right hand side of the top of the rammer This accessory can be fitted and used without interfering with the Density Indicator TEST PROCEDURE a b c d e f Position a specimen tube and pedestal cup on the tube filler beneath the funnel outlet Pass the sand to be tested through the screen until the specimen tube is filled Strickle the sand level with the top of the tube with the strike off blade Remove the specimen tube and pedestal cup and pla
35. used Remove improper weight and repeat calibration procedure with correct weight 37 RIDSDALE DIETERT AFS LABORATORY SAND RAMMER TYPE N GENERAL PRINCIPLES This machine is designed for preparing AFS standard test specimens for the determination of compression tensile transverse shear and splitting strength by compacting a pre determined weight of sand in a tube or a core box of the required shape This is achieved by dropping a known weight a fixed distance and using the energy produced to compact the sand 38 RIDSDALE DIETERT AFS LABORATORY SAND RAMMER TYPE N cont d DESCRIPTION The instrument consists of a steel shaft with a ramming head which is mounted in a cast iron frame A 14 lb weight is mounted on the shaft and can be raised and released by movement of a cam handle When the cam handle is turned the weight is released exactly 2 inches and then falls freely through the same distance to make contact with a crosshead fastened to the ramming shaft The cam fitted on the left hand side of the main frame enables both the ramming shaft and the 14 lb weight to be locked in the elevated position enabling the specimen tube or core box to the placed in position beneath the ramming head A tolerance plate is fixed on the cast iron frame above the top of the steel shaft A tube conditioner is also supplied with the rammer and is readily fixed to the base see Installation The accessories supplied
36. 15 52 11066 8 100 2 0 4 0 137 22 548 9 120 0 0 0 0 164 07 0 0 170 0 0 0 0 209 64 0 0 240 0 0 0 0 294 05 0 0 PAN 0 0 0 0 595 83 0 0 Sth 11635 3 100 116 35 cm g Coefficient of Angularity E Sw 110 0 95 Sth 16 35 20 RIDSDALE DIETERT SAND SPECIFIC SURFACE TESTER cont d CALIBRATION PROCEDURE The chart supplied with the equipment is only correct for silica sands with a relative density of 2 65 The small deviations in relative density which occur in natural foundry sands can be ignored The equipment can be used for other sands such as zircon sands and olivine sands but a volumetrically equivalent quantity of sand must be used The sample weight for a volumetrically equivalent sample of a sand other than silica is determined from the following expression Dx Wx Ws Ds where Wx is the weight of the sample of sand to be tested Ws is the weight of silica sand normally used 50 g Dx is the relative density of the sand to be tested and Dg is the relative density of silica sand 2 65 For example determining the specific surface area of zircon sand relative density 4 6 the Sample weight to be used 50 g x 4 6 2 65 86 8 g This corresponds volumetrically to 50 g of silica sand and hence the same conversion chart as for silica sands may be used 21 RIDSDALE DIETERT SAND SPECIFIC SURFACE TESTER cont d REPLACEMENT PARTS LIST Descrip
37. A light in the overtemperature controller flashes Reset the overtemperature controller Vents On the back of the unit are two vents inlet and exhaust The inlet vent is covered by a baffle which should be left in place The exhaust vent is closed by a butterfly valve which can be controlled from the front panel Rotate the knob clockwise to open the vent anti clockwise to close In non fan models there is only a small flow of air through the chamber With fan versions fumes are pushed out through the exhaust vent by fan action and drawn in through the inlet vent TEMPERATURE CONTROLLERS For operating instructions relating to Temperature Controllers see the Manufacturer s Instructions supplied with the instrument 58 RIDSDALE LABORATORY CORE TEST PIECE BLOWER GENERAL INSTRUCTIONS The Ridsdale Laboratory Core Test Piece Blower is designed for the production of bonded sand test pieces Relatively simple dies are used enabling slab test pieces of any configuration to be produced such as those needed for hot distortion tensile or transverse testing The machine can be used for making test pieces from oil cereal cold curing hot box or shell sand mixtures DESCRIPTION OF MACHINE The machine is shown in Fig 1 It consists of a main frame holding the die clamps and heater plates and a blowing head to which is attached a sand magazine which can be raised and lowered by a rack and pinion operated by a weighted handle T
38. DESCRIPTION The accessory is a highly polished tube split longitudinally the two halves being held together by means of hinged clamps and knurled screws TEST PROCEDURE a b c d e Clamp the two halves of the tube with identification marks together ensuring that they fit properly and are not held apart by sand grains Pass once over the specimen tube conditioner Ram a specimen in the normal way using a bottom pedestal cup Remove the tube and specimen from the pedestal cup and place on a flat drying plate Loosen the clamps give a few light taps and remove each half carefully without deforming the specimen If using Sodium Silicate CO2 sands remove the pedestal cup after ramming transfer the tube and specimen to the CO2 Gassing Accessory and gas the specimen After gassing loosen clamps and remove the two halves of the tube 51 RIDSDALE DIETERT SPLIT SPECIMEN TUBE AFS cont d IV MAINTENANCE Clean thoroughly and ensure all loose sand grains are removed from mating faces Clamp the two halves together and pass once over the specimen tube conditioner V RECOMMENDED SPARES Part No Description 341 Drying Plate 92 RIDSDALE CO2 GASSING ACCESSORIES AFS GENERAL PRINCIPLES These accessories are for gassing prepared AFS standard compression 2 inch diameter x 2 inch height tensile 1 inch thick central section and transverse 1 inch x 1 inch x 8 inches specimens of sand mixtures bonded w
39. ESSORY FOR USSM AFS GENERAL PRINCIPLES This accessory provides a means of uniformly pulling and breaking an AFS standard tensile specimen of baked or cured core sand on the Universal Sand Strength Machine P DESCRIPTION These specially shaped aluminium alloy jaws with self aligning contoured grips to hold the specimen are used in the top test position of the Universal Sand Strength Machine They are mounted on fulcrum pins attached to the machine by two cast iron brackets Adjustable fulcrum screws bear in sockets in the fulcrum pins to allow self alignment of the jaws Guide pins line up the two halves of the accessory when in position on the machine and permit easy introduction of the specimen INSTALLATION a With the pusher arm and the pendulum weight arm in the perpendicular position bolt the short bracket to the pusher arm using the long bolt b Raise the pusher arm and the pendulum weight arm to about the midway position on the quadrant pass the long bracket behind the pusher arm and bolt it to the pendulum weight arm using the short bolt c Return the pusher arm and the pendulum weight arm to the perpendicular position check that the fulcrum pins on the brackets are in line and tighten both bolts firmly d Place the jaws on the fulcrum pins with the guide pins in position 93 RIDSDALE DIETERT TENSILE CORE STRENGTH ACCESSORY FOR USSM AFS cont d IV TEST PROCEDURE a b c d e Inse
40. ESTER ACCESSORY cont d After cleaning remove the items and rinse in clean water It is not advisable to expose hands to cleaning materials or regularly immerse hands in an active bath At frequent intervals empty the bath and clean out the debris and residues which if left on the base will erode the stainless steel An ultrasonic bath will operate better if clean and last considerably longer Before emptying remove the mains plug from the supply ADVICE ON PROCEDURES Wherever possible site the bath close to a sink for ease of emptying Coil excess mains lead neatly behind the bath Always switch off and remove the mains plug from the supply before emptying Fill the bath with warm NOT boiling water Except for certain optical and dental models always use a basket or beaker for immersing items in the cleaning solution and prevent these items from contacting the bath base Always rinse after cleaning with clean water REMEMBER Keep bath at least full NEVER operate an empty bath Do not expose hands to cleaning solutions Use a basket or beaker NEVER let items contact the base Fill with warm water NEVER put hot water into a cold bath Remove mains plug from supply when emptying the bath NEVER use flammable toxic caustic or acid solutions Avoid breathing fumes from strong solutions Keep the bath filled with water when not in use This will prevent items dropping onto the base of an empty bath ULTRAWAVE baths are manufac
41. LET to shut b Turn RECORDER to open and wait for two minutes to allow the gas in the tube to attain furnace temperature c Turn EXHAUST to shut d Switch on the recorder e Inject the sample tube into the hot zone 118 RIDSDALE GAS DETERMINATOR cont d IV Vi TEST PROCEDURE cont d f Switch off the recorder as soon as the pen stops rising The rate of gas evolution can be observed from the pressure curve traced out on the recorder The total volume of gas evolved corrected to NTP or the volume of gas evolved after any period of time after injecting the sample into the hot zone of the furnace can be obtained by reference to a pressure volume graph which can be prepared as in Section V Calibration CALIBRATION A pressure volume graph can be prepared as follows Weigh increments of Analar potassium hydrogen carbonate KHCO3 previously dried for 30 minutes at 105 C into copper sample tubes and plug with ignited aluminium silicate fiberfax Inject these specimen tubes into the furnace as for the sand samples and record the maximum pressure attained Plot maximum pressure against theoretical volume of gas evolved at NTP ie 224 ml per gramme of dry KHCO3 Wt of KHCO3 Theoretical Vol at NTP 0 05 g 11 2 ml 0 10g 22 4 ml 0 15g 33 6 ml 0 20 g 44 8 ml 0 25 g 56 0 ml NOTE After the copper sample tubes have been used with potassium hydrogen carbonate for cali
42. Ridsdale and Ridsdale DieterT FOUNDRY SAND TESTING EQUIPMENT OPERATING INSTRUCTIONS AFS RIDSDALE amp CO LTD Registered Office NEWHAM HALL NEWBY MIDDLESBROUGH TS8 9EA ENGLAND Registration No 307575 ENGLAND Telephone 44 0 1642 300500 FAX demini 44 0 1642 315209 Email enquiries basrid co uk Website www basrid co uk British Licensees of Dietert Foundry Testing Equipment Inc Detroit USA Item Ref No No 42 CE No 42 CE No 44 CHT No 28 CPT No 14 DB No 27 EPM No 48 FHY No 41 GD No 31 GCSM No 42 GHT B No 43 GHT C No 49 HSTM No 51 TNSA H No 52 TRSA H No 46 IPT No 25 LCO No 52 CTPB No 9 LM No 10 LSM No 15 LSR No 17 CMT No 22 CGA No 16 DEI No 18 FLI No 15 RB No 21 SST No 19 TNRA No 20 TRRA No 5 MBCT No 12 MBL No 11 MTL No 29 MPA No 45 MST No 50 PBT No 26 SPM No 4 RSW No 7 SSST No 30 SIT No 23 STNA No 24 STRA No 3 SSS No 14 SWS No 6 UCTA No 32 USSM ho No 33 USSM md No 35 HDS No 34 SSA No 40 SPA No 36 TNCA No 37 TRCA No 38 TRSA AFS EQUIPMENT Description Calibration Equipment Proving Ring Calibration Equipment Test Type Permeability Standards Core Hardness Tester Core Permeability Tube Digital Balance oo eeeeeeeeeeeeeeeeeees Electric Permmeter Foundry Hydrometer Gas Determinator Green Compression Strength Machine Green Hardness Tester B Scale Green Hardness Tester
43. TRASONIC METHYLENE BLUE ACCESSORY cont d VI SPARES PARTS LIST Part No Part No 02277 02277C 02278 02279 Methylene Blue Clay Tester Description Base Cup Holder Rubber Hose Post Agitator Shaft and Blade Hose Clamp O Ring 80 mm O D 70 mm I D Rubber Stopper with hole Glass Vent Tube Vaseline 25g bottle Allen Wrench Rubber Support Motor 240 V 50 60 cycle Repeating Pipettor 50 ml Methylene Blue 500 ml bottle Tetrasodium Pyrophosphate 500 g Glass Stirring Rod Hose Pinch Off Clamp Overflow bottle Filter Paper Box of 100 Beaker 250 ml stainless steel Burette 50 ml self filling Solution bottle 1 litre Extension Clamp Clamp Holder Burette Clamp ULTRASONIC MB ACCESSORY Description Ultrasonic MB Accessory 240 V 50 60 cycle Beaker positioning cover Silicon Carbide Grit 220 mesh 200 g bottle O ring 80 mm O D 70 mm I D No required 1 NNa PD Nanana Ww S S P NY No required 1 1 1 1 12 INSTRUCTIONS STIRRER FOR METHYLENE BLUE CLAY TESTER INTRODUCTION A versatile stirrer suitable for stirring a variety of low viscosity liquids such as water and light oils in vessels of up to about 60 litres capacity ELECTRICITY SUPPLY Before connecting this apparatus to the electricity supply check the information given on the apparatus rating plate and ensure that a Your supply is single phase a c alternating current of the
44. UTION Use only a 12V Adapter with a negative tip as provided to supply AC power Use of another type of adapter may permanently damage the unit and will void the warranty a Insert the female plug into the receptacle at the rear of the unit and then into the desired electrical outlet Check your use of any extension cord which may affect power output Unplug AC adapter when not in use for extended periods Battery Operation a The Ridsdale Digital Balance can operate on one 9V Alkaline battery or AC adapter as provided b To install battery open battery cover on bottom of balance and connect battery to snap Place battery into its compartment and replace the cover Always handle battery lead wires with care DO NOT USE EXCESSIVE FORCE c Remove battery when balance is not used for extended periods Replace battery when LCD indicates LO 36 RIDSDALE DIGITAL BALANCE cont d CALIBRATION PLEASE NOTE Calibration weights are NOT supplied All balances are factory calibrated and ready to operate Calibration weights may be purchased separately if required IMPORTANT The calibration procedure is described below Only use the calibration weights provided or OIML Class weights Calibration is always recommended when first using the balance or after the unit has been moved or subjected to an extreme change in temperature Always perform the calibration procedure AFTER the unit has been allowed to warm up properly at l
45. a standard test specimen For example if p 9 6 cm and t 36s P 30072 87 9 6 x 36 By means of this instrument a measured volume of air can be passed through a rammed sand specimen and the permeability of the sand determined by recording the time taken for the air at a measured pressure to pass through the specimen Alternatively for routine control purposes calibrated orifices may be used to meter the rate of flow of air to the sand specimen and by measuring the pressure between the orifice and the specimen the permeability may be obtained by referring to the attached table or using the transparent direct reading scale 63 RIDSDALE DIETERT PERMEABILITY METER AFS cont d DESCRIPTION The body of the Permeability Meter is an aluminium casting consisting of a water tank and base Inside the water tank floats a balanced air drum carefully weighted and designed to maintain a constant air pressure of 10 cm during its fall The outlet from the air drum is connected to a centre post in the base via a three way air valve The centre post incorporates a pipe for measuring pressure which is connected to the water manometer and an expandable O ring for sealing the specimen tube It also accommodates the orifices Two calibrated orifices marked 30 and 270 respectively and an open orifice marked O are supplied A transparent scale is mounted in front of the manometer to measure the air pressure or permeability when u
46. agnetic rider is moved up a calibrated scale by the pendulum weight and indicates the point at which specimen collapse occurs The machine is calibrated in psi for 2 inch diameter x 2 inch height standard sand specimens The accessories required for the determination of shear dry tensile transverse and splitting strengths are described separately 82 RIDSDALE DIETERT HAND OPERATED UNIVERSAL SAND STRENGTH MACHINE AFS cont d Ili INSTALLATION a Set the machine on a rigid bench and level by means of the two adjusting screws until the bubble of the spirit level is centred The front edge of the pusher plate should now coincide with the O line on the scale and the pendulum weight should swing freely in the frame with the pusher plate just clearing the scale b Place the coil spring in the hole in the gear box cover plate with the small brass wear pad on the protruding end of the spring Ensure that the felt washer is in position in the recess of the hand wheel boss and place the hand wheel on the pinion shaft Adjust until the felt washer is nipped lightly between the hand wheel and the gear box cover plate and secure with the set screw in the hand wheel boss ensuring that this locates on the flat on the pinion shaft IV TEST PROCEDURE A Green Compression Strength a b c Place the compression heads in the position shown on the illustration Raise the weight arm slightly and insert an AFS s
47. air pressure does not affect the calibration of this instrument RECOMMENDED SPARES Part No Description 2201 O Ring sealing centre post 2202 O Ring cushion centre post 2205 Sealing washer orifice 2206 Pressure gauge 71 RIDSDALE DIETERT MOULD PERMEABILITY ACCESSORY GENERAL PRINCIPLES This accessory can be used with either the Standard Permeability Meter or the Electric Permmeter to measure the permeability of the actual mould surface in permeability units DESCRIPTION The unit consists of a special contact head fitted with a sponge rubber sealing washer and fixed aperture connected by a length of PVC tubing to a bell shaped adaptor which fits onto the centre post of either the Standard Permeability Meter or the Electric Permmeter By means of this accessory air at a known pressure can be forced through the mould surface and from the drop in pressure across an orifice the permeability can be obtained The aperture in the contact head has been designed to give a reading on a standard test specimen equivalent to that which would be obtained if the permeability of the specimen was determined in the normal way A sliding metal collar inside the contact head ensures that the aperture remains constant when pressed against a mould surface TEST PROCEDURE A Standard Permeability Meter a Seal the bell shaped adaptor in position on the Permeability Meter b Start the flow of air with suita
48. and from the compression or shear heads NOTE If the specimen collapses and the machine does not reverse automatically operate the limit micro switch manually and this will cause the machine to return to zero Slacken the two round headed screws in the slotted holes of the reverse micro switch mounting plate and move the switch nearer to the weight arm lug Retighten the round headed screws When testing sands of very high strength it is necessary to return the reverse micro switch to its original position in order to avoid possible damage to the switch when the specimen collapses The machine can be stopped and restarted at any point on the quadrant in order to facilitate the fitting of accessories MAINTENANCE Keep the machine clean removing surplus sand and pieces of broken specimens with a soft brush after each test Once a month remove the sand guard and oil the main drive pinion by means of the spring loaded oiler located at the top of the gear box The mainshaft ball journals and the gear box of the pusher arm are pre packed with grease and require no attention The gear rack should be free from grease to prevent sand sticking to it THE RUBBER BUMPER MUST BE KEPT IN GOOD CONDITION TO ABSORB THE SHOCK WHEN THE SPECIMEN BREAKS AND THUS PREVENT DAMAGE TO THE MICRO SWITCHES AND GEARS REPLACE WHEN IT HAS WORN DOWN TO inch THICKNESS 89 RIDSDALE DIETERT MOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE AFS cont d Vi
49. and method of applying load to specimens eg the Hand Operated Universal Sand Strength Machine should be loaded evenly at the rate of 7 5 psi compression in 15 seconds RIDSDALE SILICA SAND SAMPLER for extracting a representative sand sample Length approximately 2000 mm Diameter approximately 35 mm When testing sand or binder it is important to ensure that the withdrawn sample is perfectly representative of the whole In principle the quantity of sample extracted should be larger than the quantity used for the actual testing The volume of the original sample depends on the weight of the material necessary for the intended test on the uniformity and the quantity of the materials to be tested and on the conditions of extracting the sample for which the sand sampler is used OPERATING INSTRUCTIONS Insert the sand sampler into sand sand heap sand storage bin wagon with the aperture uppermost At the desired depth make a short sharp withdrawal movement This will release the sampling aperture cover Withdraw the sand sampler from the sand bulk and place sample into container by raising the sampler through approx 50 60 degrees This action allows the sample to slide down the inside of the tube and exit by the handle grip In order to obtain representative samples several withdrawals from different locations have to be made The original sample should preferably consist of 8 10 withdrawals which originate from as many different
50. arefully withdraw the whole furnace unit slacken the bolts holding the element tails in the brass terminal posts and remove the Sindanyo top plate secured by four screws x Empty out the Vermiculite insulation Loosen the retaining yokes and remove the faulty element and former xi Fit replacement element supplied by the furnace manufacturer and re assemble taking care to ensure that the element tails do not come in contact with the cement coated windings or a short circuit will occur xii After re assembly bring the furnace up to temperature as quickly as possible to ensure the effective curing of the cement used on the windings PLEASE NOTE THERE ARE LIVE WIRES INSIDE THE CASING DO NOT REMOVE ANY PANELS UNLESS THE FURNACE IS DISCONNECTED FROM POWER SUPPLY FURNACE MANUFACTURERS CARBOLITE FURNACES LTD PARSONS LANE HOPE SHEFFIELD 30 2RR Tele 01433 620011 Fax 01433 621198 120 RIDSDALE DIETERT GREEN HARDNESS TESTER B SCALE GENERAL PRINCIPLES This instrument is designed for measuring the surface hardness of green sand moulds and green cores The test is similar to the Brinell Hardness Test the softer the mould surface the greater the penetration of the probe into the mould The hardness number indicated is the measurement of the depth of penetration of the probe in thousandths of an inch A mould offering no resistance to penetration has a zero hardness reading and one which completely resis
51. be Start with about 165g sand and if this proves to be more or less than required find by repeated trials the correct weight of sand to form a test piece within the permitted tolerance Alternatively use the Ridsdale Dietert Density Indicator to obtain the correct weight of sand from the first trial 39 RIDSDALE DIETERT AFS LABORATORY SAND RAMMER TYPE N cont d IV Vi TEST PROCEDURE cont d d e h Transfer the sample to the specimen tube level out the surface of the sand if necessary To obtain uniform distribution of contents and more even ramming of strong sands place a second pedestal cup over the top of the tube and invert tube before placing under the ramming plunger Use the cam positioned on the left hand side of the rammer to raise the plunger of the rammer Insert the specimen tube and cup containing the sand under the plunger and make sure that the spigot on the cup is located in the hole in the base of the rammer frame Rotate the cam to release the plunger head to enable it to enter the tube and come to rest gently on the sand Ram with three drops of the sliding weight by turning the cam handle three revolutions In special cases it may be necessary to give more than three rams if this is done it should be mentioned when reporting results The top of the plunger shaft will be level with the centre line O on the tolerance plate when the height of the test piece is exactly 2 inches
52. ble orifice in position as for normal permeability tests c Press contact head firmly against the mould surface and take reading of pressure on manometer d To obtain permeability number consult perm table or use rapid reading quadrant 72 IV VI RIDSDALE DIETERT MOULD PERMEABILITY ACCESSORY con d TEST PROCEDURE cont d B Electric Permmeter a b c d Fit the bell shaped adaptor to the Permmeter in the same manner as for carrying out a standard permeability test With suitable orifice in position start the flow of air by switching on the blower motor Adjust zero Press the contact head firmly against the mould being tested and read the permeability number direct on the appropriate scale according to the orifice used MAINTENANCE See that the rubber tubing is in good condition and the contact head is not damaged RECOMMENDED SPARES Part No Description 2207 PVC Tube 2208 Contact Head 2209 Washer complete with brass insert Contact head 73 CORE PERMEABILITY TUBE GENERAL PRINCIPLES The Core Permeability Tube provides a means of determining the permeability of dried baked or cured core sand specimens after they have been stripped from the specimen tube DESCRIPTION This specially shaped tube is fitted with an internal rubber lining which can be inflated using the small hand pump provided When inflated the lining seals the curved surfaces of the specimen so that u
53. bration purposes they should be boiled and carefully dried before being re used This is necessary to remove any hygroscopic potassium salts that are formed at ignition temperature and tend to interfere with subsequent determinations MAINTENANCE a Replacement of Furnace Elements This furnace is wound with a high grade resistance wire and is suitable for maximum operating temperature of 1100 C In the event of a furnace element failing it is possible for the customer to fit a replacement element himself Alternatively if he contacts the furnace manufacturer a Service Engineer will deliver and fit a new element with a minimum of delay 119 RIDSDALE GAS DETERMINATOR cont d Vi a MAINTENANCE cont d Replacement of Furnace Elements cont d If the customer decides to fit the element himself the furnace unit should be withdrawn from the console as follows i Disconnect from the mains ii Remove the top left hand side panel from the console iii Remove the screws from the panel holding the temperature control unit situated top left hand front of console iv Slide the module out until the thermocouple terminal block is exposed v Disconnect the thermocouple vi Carefully withdraw the thermocouple vii Remove the main input leads from the two brass terminal posts viii Remove the eight securing screws from the perimeter of the Sindanyo end plate on the right hand side of the console ix C
54. ce factor as given in the table on the next page Add the products and divide by 100 to determine the theoretical specific surface area Stn 18 21 22 23 TABLE FACTORS FOR STANDARD GRAIN SIZE FRACTIONS BS 410 1986 SERIES MULTIPLICATION NEAREST MESH NUMBER FACTOR 16 19 19 22 26 48 30 37 42 44 52 90 60 74 72 72 98 02 85 115 52 100 137 22 120 164 07 170 209 64 240 294 05 PAN 595 83 When both Sih and Sw are known the Coefficient of Angularity E may be determined by dividing Sw by Sth The factors given in Table are based on a density of 2 65 With materials that have a density other than 2 65 it will be necessary to correct for this in the calculations for theoretical specific surface area as well as in the actual specific surface area determination The following example illustrates the procedure for determining Sin Sw and E Example Sample weight 50g Volume of Sand Bed 30 6 cm TIME age ik ae de oai 22 88 From the graph Figure 1 the actual specific surface may be read directly in square centimetres per gram of sand Sw 110 0 cm g 19 TABLE Il SCREEN ANALYSIS BS 410 1986 SERIES CUMULATIVE PERCENT MULTIPLIER PRODUCT NEAREST MESH No WEIGHT RETAINED FACTOR 16 0 0 0 0 19 19 0 0 22 0 0 0 0 26 48 0 0 30 0 0 0 0 37 42 0 0 44 0 0 0 0 52 90 0 0 60 0 0 0 0 74 72 0 0 72 0 1 0 2 98 02 19 6 85 48 0 95 8 1
55. ce in position on the sand rammer Lower the plunger gently onto the sand and ram with three blows Read percentage compactability as indicated by the position of the top of the plunger shaft on the scale RECOMMENDED SPARES Part No Description 2601 a 6 35 mm mesh screen 2603 Self adhesive graduated scale 46 RIDSDALE DIETERT TENSILE RAMMING ACCESSORY AFS GENERAL PRINCIPLES The Tensile Ramming Accessory is required to prepare AFS standard tensile specimens on the AFS Laboratory Sand Rammer DESCRIPTION This accessory consists of A split metal core box a base for retaining the two halves of the box and a ramming head which clamps on to the 2 inch diameter ram head INSTALLATION Clamp the ramming head on to the rammer shaft in the position shown in the illustration using the bolts and collar supplied Tighten the securing bolts evenly and just enough to grip the ram end firmly without distorting the collar 47 RIDSDALE DIETERT TENSILE RAMMING ACCESSORY AFS cont d IV TEST PROCEDURE a c d NOTE Assemble the core box and find by trial and error the weight of sand required to form a test piece 1 inch thick ea inch Start by transferring approximately 100g of sand to the core box roughly level the surface raise the ramming head using left hand side cam and place core box in position on the rammer Lower the ramming head gently onto the sand Ram with three blo
56. cimen tube on top of the sand with the flange facing downwards Ram with three drops of the weight Remove the tube carefully from the rammer and attach it to the Permeability Meter Read permeability as for moulding sand 76 RIDSDALE SHATTER INDEX TESTER AFS GENERAL PRINCIPLES This equipment is designed to allow the free fall of an AFS Standard 2 inch diameter x 2 inch height specimen of moulding sand from a height of 6 feet onto a steel anvil By measuring the degree of disintegration of the specimen the toughness or plasticity can be determined DESCRIPTION The cast iron base of the unit is machined to accept a 13 2 mm mesh BS sieve and retaining pan Through the centre of this assembly passes a solid steel anvil which is covered by a removable cap onto which the sand specimen falls Rising vertically from the rear of the base is a 7 foot steel tube which carries the ejector mechanism for the sand specimens 77 RIDSDALE SHATTER INDEX TESTER AFS cont d b c d INSTALLATION a Fit the ejector mechanism to the top of the steel tube locate in position with the BSW bolt supplied and secure the clamp Place the bottom end of the steel tube in the hole in the base casting Rotate the tube until the locating points line up with the tapped holes in the casting and secure in position with the two set screws provided Fit the sieve assembly on the machined ring in the base casting and place the a
57. cont d A e f h i j k Determination of Calibration Factor cont d Remove the beaker and place it under the burette filled with methylene blue Turn the stopcock handle so that the methylene blue flows into the stainless steel beaker and run in roughly 90 of the estimated volume Place the stainless steel beaker in the loop of the cup holder Lower the motor agitator until the agitator blade is in the sand methylene blue suspension and then switch on the motor to stir for 2 minutes This assures complete contact between methylene blue and live clay Remove the stainless steel beaker from the agitator momentarily resting the lip of the beaker against the agitator to drain off all the liquid remaining on the blade Using the glass rod remove a single drop of the liquid and place this on a filter paper Watch for the formation of a blue green halo around the outside of the central spot There will be no such halo until there is an excess of methylene blue Add methylene blue to the beaker in 1 ml steps Stir the solution for 2 minutes after each ml addition and check using the glass rod and filter paper When the final end point has been reached it is sometimes advisable to place the beaker under the agitator for a further 2 minutes of agitation to ensure complete contact of the methylene blue with all of the clay If the halo does not appear on the test spot after the additional mixing add another 1 ml o
58. d or adhere to the base of the pan Such materials will cause inaccurate sample weights and will clog the screen thus preventing rapid drying MAINTENANCE a b e All AC models are fitted with induction motors with pre packed ball bearings which do not require attention except during major overhaul by the manufacturers As air from the atmosphere is drawn in through the top of the drying unit it is desirable to occasionally blow out any dust with compressed air oil free This is facilitated by removing the top casting which is secured by three self tapping screws and the bottom gauze which is held in place by a circlip Ensure the gauze is clean and free from dust by brushing with a small stiff brush as lack of efficiency and local overheating of the element will occur if this gauze becomes choked and restricts the flow of air through the instrument 31 RIDSDALE DIETERT MOISTURE TELLER cont d VI RECOMMENDED SPARES Part No 105 113 132 150 151 167 Description Pan cooling stand Heating element Drying pan 2 inch 50 mm deep Thermostat 90 C 170 C range Time switch 0 15 minutes Tongs pan handling 32 RIDSDALE MOISTBALANCE GENERAL PRINCIPLES This balance uses the combination of dial vernier operation with centre indicating poises and magnetic damping which makes it fast and easy to use It is designed for use with the Moisture Teller or any other moisture determining equipment using
59. ding knife edge rests on the side of the specimen that was strickled off c Apply the load in the recommended manner until the specimen breaks d Read the dry shear scale and multiply by 4 to give the load supported by the specimen in pounds Test at least 10 transverse test specimens Specimens that are manifestly faulty shall not be considered in determining the transverse strength The average of the acceptable values shall be reported as the transverse strength of the group IV RECOMMENDED SPARES Part No Description 2005 Stepped Collar BSW is British Standard Whitworth thread 98 RIDSDALE DIETERT SHELL MOULD TRANSVERSE ACCESSORY AFS GENERAL PRINCIPLES The Shell Mould Transverse Accessory AFS provides a means of making 1 inch x 4 inches x inch transverse specimens and of determining their breaking strengths in conjunction with the Transverse Shell Strength Accessory for the Universal Sand Strength Machine DESCRIPTION The Shell Mould Transverse Accessory AFS includes a split 2 cavity pattern former plates for making inch thick transverse specimens and a hopper strike off assembly aa ce N i oe TEST PROCEDURE a b c d e Heat the base plate to approximately 200 C in an oven or enclosed stove Stand the hopper strike off assembly on to its broad edge and fill with pre coated sand mixture so that the mixture in the two pockets is level with the ends Place
60. e but the entire roll can be rewound if required Use a sharp knife or razor blade and make a straight cut as nearly vertical as possible This can be anywhere within the 47 to the left of the pen Gently ease the chart out from the guide channels in order to cut the extreme edge if necessary and ensure that the leading edges are re entered into the channels Remove the belt from the left hand pulley and tilt the re wind shaft to the left until the roll clears the chart unit top plate then lift the shaft out of its bottom socket Grip the roll firmly and turn the pulley anti clockwise for about half a turn to release the trapped leading edge of the chart Pull the shaft upwards and it should slide out of the rewound roll Refit the rewind shaft inserting the lower end into its socket first then swinging the shaft into the slot in the top plate Give the shaft a turn or two in a clockwise direction to ensure that it is free then refit the belt The Chart should now be picked up automatically and rewound when it reaches the rewind shaft The pen used on the Arkon 63 Pressure Recorder is now a fibre tip throwaway type To replace exhausted fibre tip pen pull out from the holder and push in replacement After refitting ensure that the fixing boss lies parallel with the chart face The nib is designed to work in this position If the nib is at right angles to the chart the pen will be trapped when the door is closed Zero Adjustment
61. east 30 minutes It is also recommended to re calibrate the unit periodically during long periods of use and always to start a procedure by taring the unit to re zero the balance External calibration is performed through use of the keypad controls and proper calibration weights Internal factory calibration is preset and performed by accessing internal components Access to internal components by other than a factory authorised technician will void warranty coverage of this unit Calibration Procedure a After allowing unit to warm for 30 minutes remove all items from the tray top and tare the balance b After observing a stable ZERO with a stable arrow in the g gram mode press and hold the CAL MODE button until calibration weight value appears on the display c Gently place the correct calibration weight as provided or equivalent OIML Class Weights onto the tray top d The sign will disappear Wait approximately ten seconds as the unit performs internal calibration IMPORTANT Do not disturb the balance during this time Avoid vibration and air currents e When calibration is complete the unit will beep correct calibration weight value will disappear for one second then reappear as an active weight value The balance is now calibrated f Remove calibration weight and press the TARE button to reset the zero point NOTE If calibration weight value remains on the LCD display an improper calibration weight has been
62. ee end of the chart and cut it so that the loading edge is vertical for the whole width of the chart When viewed from the back there is a spring loaded flap at the extreme left hand end swinging on a vertical rod Pass the free end of the chart between the flap and the rod and springing the flap slightly pass the chart out between the flap and the drive shaft sprockets against which the flap bears Release the flap swing the chart unit round so that the chart is seen protruding from under the flap now at the right hand end Raise the flap and gently adjust the chart so that the holes engage the drive sprocket teeth and ensure that the chart is not one hole out of position at top or bottom The time lines should be parallel with the edge of the flap 116 b RIDSDALE GAS DETERMINATOR cont d INSTALLATION cont d Chart Recorder cont d vii Turn the knurled adjusting knob which also serves as a pulley clockwise when viewed from the top and as the chart advances ensure that it enters the guide channels at top and bottom of the platen Swing the unit back into place and by slight pressure at the left hand end push it over the ramp which holds it in the working position The unit will drop into place when the correct position is reached At this position it is possible to feel a positive stop in each direction preventing further swinging action about its pivots Cutting Off Chart This may be carried out at any tim
63. epth of penetration it is possible to assess the hardness at varying distances from the mould surface Routine acceptance tests on cold self hardening sand mixtures can be carried out with this instrument by assessing the number of impacts required to penetrate the probe a given distance into the mould surface when the required sub surface hardness for stripping has been achieved RECOMMENDED SPARES Part No Description 2701 Graduated Probe 128 RIDSDALE DIETERT MOULD STRENGTH TESTER AFS GENERAL PRINCIPLES The Mould Strength Tester is used to measure the green compression strength of moulds on the foundry floor Any reasonable flat or gently curved mould surface may be used The tester can be operated at any angle thus making it possible to take strength measurements on vertical surfaces of a mould A reading is obtained which is comparable to the green compression strength test obtained on a standard test specimen rammed to the same degree as the mould DESCRIPTION This instrument is a dial gauge indicator calibrated in psi with a specially shaped spring loaded probe marked with a graduation line inch from the tip It is designed as a pocket instrument and has a capacity of 0 30 psi TEST PROCEDURE a Release the bezel clamping screw and rotate the milled bezel until the indicating pointer is at zero Re clamp the bezel Turn the centre button to bring the slave pointer to rest against the indicating pointer
64. ettor by tilting it until the liquid fills the upper receptacle and spills over into the measuring tube filling it to the 50 ml drain edge then tilting it the other way to drain the 50 ml into the stainless steel beaker Slip an O ring up over the beaker so that its top is located 3 4 19 mm below the bottom of the flared section Transfer the beaker to the Ultrasonic Accessory Slip the beaker down through the central opening in the cover which should position the beaker so that approximately 0 4 10 mm is submerged The water level should be approximately 1 43 mm above the bottom of the tank Switch on the Ultrasonic Accessory and allow to operate for 5 minutes Remove the beaker and carry out the methylene blue titration procedure in the same manner as described in the determination of calibration factor procedure above Sections A e to A j The total live clay is calculated by dividing the number of ml of methylene blue to reach end point by the calibration factor as in A above Dispersed Live Clay Determinations a b c In a system sand not all of the clay present is in the proper form to contribute strength to the mix Some of the clay is present in lumps or colonies and may be entrapped by other additives For maximum strength the clay should be thoroughly dispersed and completed distributed over the grains This is seldom the case There is usually a difference between the total amount
65. f methylene blue and test again Repeat until the halo persists A weight of 0 3 g of clay in a 5 g sample is equivalent to a 6 mix Divide the total volume of methylene blue required to reach final end point by 6 to determine the calibration factor of the clay being tested NB Where a fireclay is being tested which has a relatively lower MB requirement than bentonites a 0 5 g sample can be added to 4 5 g of sand and tested in this case the calibration factor will equal the volume of methylene blue divided by a factor of 10 Similarly where a blended additive is being tested similar proportions of the constituent clays should be prepared up to say 0 5 g sand added up to a total weight of 5 g and the procedure carried out as above again the calibration factor of this blended additive will equal the volume of methylene blue required to reach end point divided by a factor of 10 RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d IV TEST PROCEDURE cont d B C Total Live Clay Determination a c e f Take a representative sample of approximately 15 g of the system sand to be tested Remove any contaminants and dry the sample to constant weight in a moisture teller or drying oven Weight out a 5 00 g sample for the methylene blue total clay test and transfer to one of the 250 ml stainless steel beakers Add 50 ml of 2 tetrasodium pyrophosphate solution via the repeating pip
66. for any particular application c Place the point of the probe on the mould surface Hold the instrument at right angles to the surface and press the instrument firmly inwards until a definite impact is felt It is important that the spring loaded hammer in the body of the instrument should be responsible for forcing the probe into the surface and hence only sufficient pressure should be applied by the operator to release the hammer mechanism d Repeat this operation without withdrawing the probe from the surface and record the number of impacts necessary to bring the first one centimetre graduation mark level with the mould surface e Continue impacting the probe into the mould maintaining it at right angles to the surface and record the number of impacts necessary for each centimetre of the probe to penetrate the mould NOTE To avoid damage to the probe care should be taken to keep the body of the instrument in line with the probe during penetration INTERPRETATION OF RESULTS It is known that uniform hardening is not normally achieved from the surface to the interior of a mould or core during the hardening process It is generally desirable to strip a mould from its box as soon as sufficient hardening has developed to avoid distortion or breakage As a rule the time required for this is much less than that for full uniform hardness development By plotting the number of impacts per centimetre of probe penetration against the d
67. h bonding material if any sprinkled over it Remove the tundish cover Lower the wire guard and start the mill Allow dry ingredients to mix for 1 minute before adding water Pour a measured amount of water into the tundish and allow the bond to develop for approximately 3 5 minutes Empty mill by withdrawing sliding door in the bottom of the pan whilst the rollers are still in motion Stop the mill Replace the tundish cover Clean the mill by removing sand which is not ejected by the scrapers with a piece of steel plate and a stiff brush lifting the rollers to clean underneath them UNDER NO CIRCUMSTANCES SHOULD THE FINGERS OR ANY IMPLEMENT BE PLACED INSIDE THE MILL WHILST IT IS IN MOTION 25 RIDSDALE LABORATORY MILL cont d V VI MAINTENANCE a Check the oil level in the gear box monthly Top up when necessary with CASTROL ALPHA 617 or equivalent gear oil b Grease thrust bearings and roller crankshaft bearings monthly via grease nipples in crosshead do not over grease To allow for more through cleaning of the mill the pan can be removed from the base by slackening off the set screws in the rim The rollers complete with crankshaft can be removed by slackening off the set screws in the securing collars NOTE Before removing pan mark position relative to circular base to ensure pan is replaced in same position It should not be necessary to remove the scrapers but if for any reason this is
68. h diameter x 2 inch height test specimen which is a measure of its resistance to breaking under a compression load applied perpendicular to the circumference of the specimen DESCRIPTION The Splitting Strength Accessory consists of a specimen holder which has a swivel arm attached for the purpose of locating the test specimen prior to applying load INSTALLATION Locate the specimen holder on the lower compression head of the GCSM with the swivel arm in the vertical position TEST PROCEDURE Place the AFS Standard 2 inch diameter x 2 inch height test specimen in the specimen holder locating against the vertical swivel arm and the back stop so that the load from the GCSM will be applied perpendicular to the circumference of the specimen then swing the arm clear and apply load in the recommended manner see Operating Instructions for GCSM until the specimen collapses The splitting strength is read directly in psi from the GCSM scale 104 RIDSDALE HIGH STRENGTH TESTING MACHINE AFS GENERAL PRINCIPLES The High Strength Testing Machine together with the appropriate accessories will determine the compression tensile and transverse strengths of moulding and core making materials beyond the capacity of the Ridsdale Dietert Universal Sand Strength Machine DESCRIPTION The machine consists of a twin column motorised screw system horizontally mounted in a mechanically rigid frame and a control panel incorporating a cypher with the op
69. hatter Index value in conjunction with the moisture content and the compression strength gives a useful guide to the mouldability of a sand that is the kind of lift which can be obtained when a sand mould is removed from a pattern MAINTENANCE Keep the machine clean and oil the bearings on the plunger shaft with a little light oil RECOMMENDED SPARES Part No Description 802 Lid sieve assembly 803 13 2 mm mesh sieve sieve assembly 804 Receiver sieve assembly 819 Anvil 820 Anvil post 79 RIDSDALE DIETERT GREEN COMPRESSION STRENGTH MACHINE AFS GENERAL PRINCIPLES This machine is designed to determine compression strength of prepared specimens of green sands and unbaked core sands by applying a progressively increasing spring load to the specimen until it collapses DESCRIPTION The machine consists of a spring balance and a pair of self aligning compression heads all supported in a strong metal frame By means of a hand wheel a load can be applied to a sand specimen held in the compression heads via the spring balance The load required to cause the specimen to collapse is recorded on the dial of the spring balance by means of a slave pointer which indicates the compression strength in psi using an AFS 2 inch diameter x 2 inch height specimen 80 RIDSDALE DIETERT GREEN COMPRESSION STRENGTH MACHINE AFS cont d DESCRIPTION cont d Three ranges of spring balance are available for this mac
70. he air bubbles RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d INSTALLATION cont d u v w x y Place one of the stainless steel 250 ml beakers under the burette turn the stopcock handle and run out just enough methylene blue to fill the lower portion of the burette Turn the stopcock handle again and run in just enough methylene blue to spill a drop or two from the overflow tube at the top of the burette thus refilling the burette to zero The stopcock handle should be in a horizontal position when the operator is neither filling nor draining the burette Prepare 500 ml of preliminary solution Weigh out 10 g of tetrasodium pyrophosphate using an ordinary laboratory balance and dissolve in 500 ml of distilled water Pour the prepared solution into the flask which makes up the lower part of repeating pipettor Check to see that the chuck is holding the stirring shaft securely to the motor With the motor switch in the OFF position plug the input cord into a power source as indicated on the motor name plate Turn on the motor and observe the action of the stirring blade The blade edges should be facing up and moving forward so that they cut into the liquid The methylene blue standard solution is non toxic but it is a powerful dye and the operator should be careful to protect the working area and his clothing as the stain is difficult to remove TEST PROCEDURE A Determinat
71. he sand mixture contained in the magazine is blown into the die by operating a lever The die temperature is controlled by a thermostat The individual parts are numbered in Fig 1 and their functions are as follows No 1 Temperature Control Panel Enables the required die temperature to be set The temperature of the dies is indicated on the digital display in C 59 RIDSDALE LABORATORY CORE TEST PIECE BLOWER cont d DESCRIPTION OF MACHINE cont d No 2 Air Pressure Regulator This regulator enables the required blowing air pressure to be selected by turning the knob and maintains this pressure against small fluctuations in the mains supply pressure The gauge indicates the pressure of air supplied to the sand magazine No 3 Air Inlet The air inlet is attached to the side of the pressure regulator The coupling is in BSP No 4 Blower Lever The blower lever controls the air supply to the sand magazine and is operated by pulling the knob downwards smartly A safety device prevents the blow valve being operated until the sand magazine is in contact with the die No 5 Magazine Positioning and Clamping Handle This weighted handle is used to raise and lower the sand magazine The weight is sufficient to hold the magazine in contact with the die during the blowing operation No 6 Sand Magazine This consists of a cylinder having a quick release joint at the upper end and a nozzle at the lower end It can be
72. he stainless steel beaker should be approximately 0 2 5 mm RIDSDALE DIETERT i k 1 m n 0 q r s METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d INSTALLATION cont d Position the unit so that there will be no direct heat against the methylene blue solution bottle If a heat vent in the room is too close to the bottle it could evaporate water from the solution and change its strength Position the burette in the burette clamps so that the tip of the burette is 4 100 mm above the base The top clamp should grip the burette just below the enlarged overflow section The lower clamp should grip the burette just below the 50 ml marking This will prevent the clamps from obstructing the graduations in the working range Slide the rod from the extension clamp holding the solution bottle into the upper clamp holder and tighten it in place Check to ensure that the bottle is held securely Wet the free end of the rubber tubing coming from the two way stopcock and slip it over the outlet tube at the bottom of the amber solution bottle This bottle is amber in colour to prevent light from affecting the methylene blue The outlet tube should face to the rear Position the small overflow bottle inside the three pegs at the rear of the base The rubber tubing from the overflow tube at the top of the burette can now be placed in the neck of the overflow bottle Lubricate the stopcock and
73. he thumbscrew points to the front of the base Attach the second burette clamp to the post approximately 15 375 mm from the top of the third clamp Attach clamp so that the portion of the clamp which holds the burette points to the front of the base Attach the extension clamp to the post approximately 5 125 mm from the top of the fourth clamp Attach the clamp so that the thumbscrew points to the front of the base then check to ensure all the clamps lie on the same vertical line with the base This will allow the burette to be positioned vertical and reasonably level Position the solution bottle holder Attach the cup holder to the bottom clamp holder Attach the cup holder so that it projects approximately 6 150 mm to the right of the post Attach the agitator shaft to the motor and lock the nut on the coupling Attach the motor mounting shaft to the middle clamp Note that for proper alignment between the agitator and beaker the stainless steel beaker should be placed in the cup holder Slide the motor mounting shaft in the clamp until the agitator disc is centred inside the stainless steel beaker Lock the back thumbscrew on the clamp once the proper position is found The clamp holding agitator motor will have to be raised and lowered to allow placement and removal of beaker When the clamps which hold the agitator motor and the cup holder are properly aligned the distance between the agitator disc and the bottom of t
74. hine 0 4 5 psi 0 12 5 psi and 0 31 psi on a 2 inch diameter x 2 inch height specimen A sample holder is provided with each machine to facilitate the positioning of the specimen in the compression heads and in the case of the low capacity balance a special sample plate is supplied on to which the specimen can be stripped directly from the split specimen tube when dealing with very weak sand mixes TEST PROCEDURE a b c e f Prepare a test specimen on an AFS Standard Rammer For routine purposes this can be made on a green sand test specimen after the permeability has been determined For research work a fresh specimen should be prepared Carefully transfer the test specimen to the compression machine by means of the sand pan provided and place centrally on the lower compression head If the sand is very weak prepare a specimen in a split specimen tube and use a low capacity spring balance with a more open scale having a maximum reading of 4 5 psi on an AFS 2 inch diameter x 2 inch height specimen In this case the specimen should be stripped directly on to the special sample plate provided with the low capacity balance Rotate the hand wheel in a clockwise direction until the weight of the specimen is supported by the spring balance Zero the moving pointer by means of the knurled screw on the top of the balance Set the slave pointer to zero Ensure that the compression heads are free to self align and turn the
75. hredded 1 5 minutes Iron ore crushed 6 8 minutes 30 RIDSDALE DIETERT MOISTURE TELLER cont d IV TEST PROCEDURE cont d b c e f i Rotate time switch to about 3 minutes and allow Moisture Teller to heat up while weighing out first sample Weigh a sample of the material to be tested using the special Moistbalance Place the material in the sample pan as quickly as possible until equilibrium is obtained any long delay during weighing may cause loss of moisture which would lead to low results Remove the sample pan from balance with the special tongs and spread the sample evenly over the base Insert the pan into the Moisture Teller by depressing the rubber button on the extension from the pan holder Release and ensure that the top edge of the pan fits against the underside of the Moisture Teller Rotate the time switch knob to the desired during time When the timer switches off the motor and heater transfer the sample pan to the cooling stand using the special tongs When cooled to room temperature place the sample pan on the balance Read the percentage moisture directly from the dial without calculation If the sample contains more than 20 moisture use a 25 g sample and multiply the dial reading by two After each test empty the sample pan and brush out any material adhering to it Do not rap the pan on the bench as this may damage the top rim Do not attempt to dry materials which melt an
76. ion of Calibration Factor If the calibration factor being the number of ml of MB solution required for each percent of equivalent bentonite or clay is not known this must first be determined by the so called equivalent material method as follows a Weigh out 0 3 g of the clay whose calibration factor is to be determined and 4 7 g of base sand Transfer these to a stainless steel beaker and add 5 g of 220 mesh silicon carbide as provided with the Ultrasonic Accessory b Add 50 ml of 2 tetrasodium pyrophosphate solution via the repeating pipettor by tilting it until the liquid fills the upper receptacle and spills over into the measuring tube filling it to the 50 ml drain edge then tilting it the other way to drain the 50 ml into the stainless steel beaker Slip an O ring up over the beaker so that its top is located 19 mm below the bottom of the flared section c Transfer the beaker to the Ultrasonic Accessory Slip the beaker down through the central opening in the cover which should position the beaker so that approximately 0 4 10 mm is submerged The water level should be approximately 1 43 mm above the bottom of the tank d Switch on the Ultrasonic Accessory and allow to operate for 7 minutes The silicon carbide particles will act as abrading surfaces and aid the complete dispersion of the clay RIDSDALE DIETERT IV METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d TEST PROCEDURE
77. itch 1229 Time switch 28 RIDSDALE DIETERT MOISTURE TELLER GENERAL PRINCIPLES A weighed representative sample of the moist material is placed in a special pan with fine gauze base and hot air at a thermostatically controlled temperature is blown through it for a pre determined time to remove the moisture When all the moisture has been removed the sample pan and contents are rapidly cooled and re weighed The loss in weight is read directly as percentage moisture on the dial of the special Moistbalance DESCRIPTION This instrument consists primarily of a hot air blower with a thermostat to control the temperature of the air and a time switch to switch off both air and heat after a pre determined period of time 29 RIDSDALE DIETERT MOISTURE TELLER cont d DESCRIPTION cont d The thermostat is calibrated 0 9 and is normally set to cover the range 90 C 170 C Three sample pans are supplied so that while one sample is cooling another can be drying and the third can be weighed At the base of the instrument a spring loaded pan holder locates the sample pan in position This can be adjusted to accommodate 1 inch 25 mm 2 inch 50 mm or 4 inch 100 mm deep pans according to the bulk of the sample under test 2 inch 50 mm deep pans are recommended for foundry sands and this is the standard size supplied unless otherwise requested The three sample pans have a fine Hollander cloth base supported by perforated tin
78. itch to activate the temperature controller the O position is off the position on The controller will become illuminated and go through a short test cycle Adjust the temperature controller Overtemperature option Hydraulic thermostat Set the rotary dial to the desired protection temperature Overtemperature option Digital f the overtemperature controller has not yet been set as required set and activate it Unless a time switch is fitted and is off the oven will begin to heat up according to the controller set point or program To switch the oven off set the instrument switch to off If the oven is to be left off isolate it from the electrical supply 57 b c RIDSDALE LABORATORY CORE BAKING OVEN MODEL PF 60 cont d OPERATING INSTRUCTIONS cont d Overtemperature Control The overtemperature controller should typically be set at 15 C above the main controller If an overtemperature condition occurs always investigate the possibility that the main control system has failed An overtemperature condition always cuts off power to the heating elements To reset the condition first either allow the oven to cool or increase the overtemperature setting Hydraulic thermostat If the overtemperature trip operates then a loud click occurs and a warning light adjacent to the thermostat lights up the red reset button on the thermostat pops out Reset the thermostat by pressing the red button Digital
79. ith sodium silicate binders DESCRIPTION The accessories consist of three hollow perforated bases with gas inlet ferrules designed to accommodate the split specimen tube tensile core box and transverse core box respectively INSTALLATION Connect the gas inlet ferrules to a controlled flow of CO2 gas TEST PROCEDURE A Compression Test Specimens a Prepare an AFS standard 2 inch diameter x 2 inch height test specimen in a Split Specimen Tube b Place the tube and specimen on the rubber gasket in the gassing accessory with the specimen at the bottom c Gas for 60 seconds at a flow rate of 5 litres min and strip the specimen 53 RIDSDALE CO GASSING ACCESSORIES AFS cont d IV TEST PROCEDURE cont d B Tensile Test Specimens r a Prepare an AFS standard 1 inch thick central section tensile test specimen in the Tensile Ramming Accessory b Remove the core box and specimen from the base and place in the Tensile Gassing Accessory Hold firmly in position with the clamping screw provided c Gas for 60 seconds at a flow rate of 5 litres min C Transverse Test Specimens d a Prepare an AFS standard 1 inch x 1 inch x 8 inches test specimen in the Transverse Ramming Accessory b Remove the sand hopper and cut off knife and carefully brush any loose sand grains from the top face of the core box 54 RIDSDALE CO GASSING ACCESSORIES AFS cont d IV TEST PROCEDURE cont d C Transve
80. kage press F4 simultaneously Once the specimen has broken press the stop button and remove the remains of the previous test piece Repeat from Procedure a to carry out further tests 110 RIDSDALE PEEL BACK TESTER FOR INVESTMENT TESTING OF RESIN COATED SHELL SAND F GENERAL PRINCIPLES This apparatus assesses the proportion of resin coated sand which peels away from the main body of the cured mould The Peel Back Tester consists of a hopper assembly mounted above a 250 x 250 x 30 mm hot plate controllable to 10 C which is set in an elevated position and pivoted at the centre to enable it to be rotated through 180 A sample tray sits beneath the assembly to collect the sand material which peels away When the required temperature of the hot plate has been reached and stabilised an accurately weighed quantity of resin coated sand is released from the hopper onto the hot plate After a pre determined time the hot plate is rotated through 180 in order to remove the uncured sand which falls on to the sample tray beneath the assembly Peel Back quantity and curing speed factor are calculated from the proportion of sand falling on to the sample tray compared with the original weight SPECIFICATIONS Net Weight 27 5 kg Dimensions 580 x 300 x 500 mm Power Supply 220 230V PURPOSE To determine if cured sand separates and allows some to peel away from the main body of the core or mould a Switch on Pee
81. l Back Tester and adjust the Eurotherm to 205 C When the Eurotherm reaches the pre set temperature carry out the following test procedure b Obtain a representative sample of the material to be tested of 300 grams weighed accurately Make sure the heating plate is in the horizontal position 111 RIDSDALE PEEL BACK TESTER cont d PURPOSE cont d c d e Transfer the sample to the stainless steel funnel placing a finger over the bottom of the funnel to restrict sand flow Swing the funnel over to the centre of the hot plate and release the sand sample onto the plate Leave for 18 seconds and then invert the hot plate 180 and allow to set for an additional one minute After one minute weigh the material that has been collected in the tray on the bottom of the machine and subtract this weight from the sample weight used to give you a percentage peel 112 RIDSDALE CALIBRATION EQUIPMENT fF PROVING RING TEST PROCEDURE a b c d e Locate the two studs into the lower compression head position of the Universal Sand Strength Machine Zero the dial gauge by rotating the bezel and lock in position using the locking mechanism if required Place the gauge between the studs and locate the pivots on the steel ring into the studs Using the table of certified readings provided with the instrument start the machine and stop at the appropriate points as detailed on the table The to
82. laced on the instrument as in normal testing When using the check jets the permeability number indicated on the dial of the instrument should correspond with the number stamped on the check jet subject to a tolerance of one division ie 10 for the 150 jet and 1 for the 15 jet 70 RIDSDALE DIETERT ELECTRIC PERMMETER cont d V VI CALIBRATION AND MAINTENANCE con d If the instrument appears to be out of calibration blow out the calibrated orifices with clean dry compressed air NEVER CLEAN ORIFICES WITH METAL POINT OR WIRE NOTE The check jets are not interchangeable and must only be used on the instrument with which they are supplied see instrument serial number stamped on jet If adjustment is required to obtain the necessary 100 mm air pressure carry out the following procedure a Switch on blower motor b Place lever in check position c Set rheostat in mid way position of total travel d Remove hex plug positioned on the top of the machine to right hand side of the centre post to gain access see e e Slacken off 2BA brass nut using box spanner pass screwdriver down through the centre of the box spanner and turn screwed spindle in a clockwise direction till 100 mm reading is obtained Retighten the locknut and replace hex plug Tools required 2 BA Box Spanner and instrument screwdriver sufficiently long to protrude through the centre of the box spanner NOTE Adjusting the
83. lates Blow the next test piece and repeat operations from c onwards MAINTENANCE OF THE EQUIPMENT Maintenance will be confined to cleaning off sand from the equipment Lubrication is not required any oil will attract sand and dust Attention should be paid to cleaning out the magazine after use and maintaining the cylinder in a clean condition 62 RIDSDALE DIETERT PERMEABILITY METER AFS GENERAL PRINCIPLES Permeability is defined by the AFS as that physical property of moulded sand which allows gas to pass through it It is determined by measuring the rate of flow of air through the AFS standard rammed specimen under a standard pressure The general formula for the calculation of permeability may be expressed as follows P vxh Where P Permeability number pxaxt v Volume of air in ml passing through the specimen h Height of test specimen in cm p Pressure of air in cm of water a Area of cross section of specimen in cm t Time in seconds Since the standard method requires that 2000 ml of air should be forced through a specimen 2 inches 5 08 cm and 2 inches diameter 20 268 cm area by substituting these values for v h and a and measuring the time in seconds the formula becomes P OO we a P air pressure in cm of water x time in seconds To determine permeability it is therefore only necessary to measure accurately the time taken for 2000 ml of air at a known pressure to pass through
84. lerance allowed on these readings is 1 division ie 001 inches Reverse the machine using one of the micro switches and unload the Proving Ring 113 RIDSDALE CALIBRATION EQUIPMENT TUBE TYPE PERMEABILITY STANDARDS FOR ROUTINE CHECKING OF ELECTRIC PERMMETER TEST PROCEDURE a b c d e f h i Switch on blower motor of the Electric Permmeter by moving toggle switch to the ON position Allow the motor to run for at least one minute in order to obtain a stable reading on the gauge Remove rubber stoppers from tube and select orifice for the standard to be tested ie for permeability standard marked LOW use orifice marked S for permeability standard marked HIGH use orifice marked L Place the specimen tube containing the permeability standard uppermost over the centre post of the Permmeter Rotate the knurled ring of the centre post anti clockwise to seal the specimen tube Place the lever on the left hand side of the Permmeter body in the CHECK forward position Adjust the motor speed control rheostat to obtain a pressure reading of exactly 100 mm or O permeability on the pressure gauge Move the lever to the TEST rear position and read permeability from the appropriate scale according to the orifice in use Return lever to its CHECK position and confirm that a pressure of 100 mm is still recorded Release the specimen tube by rotati
85. m carriers are loosened using the key provided enabling the two parts of the accessory to swivel Screw in the large support arm carrier of the accessory into the load cell a at approximately 45 ensuring that the sample support pin is located at the bottom of the arm Locate the other half of the accessory into the traversing ram b Line up each half of the accessory using the locating pins and tighten up the socket head screws on the support arm carriers ensuring the accessory does not touch or foul any part of the machine and then remove locating pins TEST PROCEDURE a b c Using one of the direction of travel buttons on the cypher adjust the distance between the support arm carriers to accommodate a transverse sand specimen allowing approximately 1 16 inch 1 5 mm clearance Place the specimen between the knife edges replace the perspex safety cover Before commencement of the test ensure that the cursor is displayed on the left hand bottom corner of the cypher display To adjust the cursor repeatedly press the max min button 109 RIDSDALE TRANSVERSE CORE STRENGTH ACCESSORY FOR HIGH STRENGTH TESTING MACHINE cont d ll TEST PROCEDURE cont d d e f g h for tranverse testing select Mode 3 button on the cypher Zero the display on the ipher using the reset and zero buttons To test press one of the direction of travel buttons If using software pac
86. m of the core box b Fill the box with sand to the top of the hopper and strike off level with the strickle plate ensuring that there are no open pockets in the sand 49 RIDSDALE DIETERT TRANSVERSE RAMMING ACCESSORY AFS cont d IV TEST PROCEDURE cont d c Raise the ramming head using the left hand side cam and place the core box in position on the rammer Carefully lower the plunger into the hopper and line up Ram with four blows d Raise the plunger turn the core box assembly through approximately 45 and allow the weight of the ram to rest on top of the hopper Insert the knife from one end of the assembly and cut off the core specimen e Remove the core box assembly from the rammer and lift off hopper Set the core box with drying plate on the bench and rap lightly Carefully remove the two halves of the core box from the specimen f Dry or cure the specimen and cool before testing NOTE The use of a Mould Release Agent will assist in the clean stripping of the specimens V RECOMMENDED SPARES Part No Description 367 Drying Plate 368 Cut off Knife 50 RIDSDALE DIETERT SPLIT SPECIMEN TUBE AFS GENERAL PRINCIPLES A means of forming an AFS standard 2 inch diameter x 2 inch height specimen in sands which are very weak in the green state This accessory also affords a convenient method of preparing and gassing AFS standard 2 inch diameter x 2 inch height specimens in Sodium Silicate CO2 sands
87. machine on a rigid bench and level by means of the two adjusting screws until the bubble of the spirit level is centred The front edge of the pusher plate should now coincide with the O line on the scale and the pendulum weight should swing freely in the frame with the pusher plate just clearing the scale Attach the stop bracket securely to the front of the main casting at the bottom left hand side by removing the nuts from the screws supplied and using the two tapped holes provided The adjustable stop is pre set and normally does not require adjustment REMOVE THE LOCATING COLLAR AND WASHER FROM THE MAINSHAFT and fit the pusher arm complete with motor unit so that the stop micro switch is jut clear of the stop bracket and the reverse micro switch is just clear of the lug of the weight arm Secure in position with the two set screws ensuring that they locate in the dimples in the shaft The limit switch has been removed for packing purposes This requires refitting as follows Remove the two screws from the bracket slide cable in slot in the frame casting so that the rubber grommet sits in counter bored hole in the casting Secure the bracket with the two screws in the tapped holes provided Connect the motor unit to the control unit on the main frame by means of the eight pin plug and socket outlet Connect to appropriate power supply see motor nameplate for correct voltage and frequency using a three pin plug In the
88. magazine to the blow head d In all cases ensure that the faces of the magazine and blow head joint are clean before fastening e To prevent overheating the magazine should only be attached to the blow head during the time that test pieces are being produced 61 RIDSDALE LABORATORY CORE TEST PIECE BLOWER cont d V NOTE NOTE VI INSTRUCTIONS FOR USE cont d Blowing Operation a j k 1 Set the air regulator to the correct pressure Recommended pressures are as follows Shell Sands 80 90 psi 6 bars This is a guide only and can be adjusted to suit users sand system mix Do not exceed 100 psi 7 bars blowing pressure Check that the magazine contains sand mixture and is attached to the blow head correctly as in previous instructions Clamp the die in the correct position Lower the magazine on to the die Depress the blow lever firmly Hold down for about 2 seconds Release the blow lever Raise the magazine from the die This operation is important and prevents overheating of the die nozzle and magazine When using hot curing mixtures allow the filled die to remain clamped between the heater plates for the necessary curing period Then release the clamp and withdraw the die When blowing shell sand the nozzle should then be tapped to release any adhering sand Strip the test piece from the hot die by means of a stripping post Wipe the die clean and replace between the heater p
89. marking on the right hand tube Allow the kerosene to drain from the sides of the tube for a few minutes before adding the last few drops to bring the liquid level up to the black marking Secure a representative sample of sand and remove the clay using the AFS Clay Content procedure Wash enough sand so that sufficient clay free sand will be left to use for a 50 g sample Dry the sand sample at 105 C and weigh out a 50 g sample Place the sand in the burette filling it as uniformly as possible to minimise segregation 16 RIDSDALE DIETERT SAND SPECIFIC SURFACE TESTER cont d PROCEDURE cont d 5 6 7 8 10 11 12 13 14 15 Tap the burette by hand or with a pencil until the sand volume cannot be reduced any further When tapping the burette avoid striking the graduations Record the volume of sand in the burette Place the burette in the rubber sealing sleeve 3 in the tester base To prevent the burette holder from seizing in the rubber sealing sleeve it is best to dust the burette holder with talc before positioning it in the sleeve Set the valve handle to the SET position and very carefully squeeze and release the rubber bulb 01221 at the right of the unit When the bulb is released it will draw the kerosene up in the volumetric tube 7 CAUTION If the bulb is released too quickly the liquid level may be drawn over the top of the volumetric tube into the metal tube at the
90. material can be gleaned b The test procedure is carried out in a similar way as described in Section A selecting the appropriate weight of clay or additive to mix with the sand and silicon carbide prior to ultrasonic scrubbing c A change in the volume of methylene blue required to produce the end point halo will indicate a change in nature of the clay or the proportions of its constituent material ULTRASONIC METHYLENE BLUE ACCESSORY The Ultrasonic MB Accessory can be used to determine total live clay or to test incoming clay or additive shipments as described in the test procedures A B and D above To use this instrument merely fill the inner stainless steel tank with distilled water or clean tap water to a level of approximately 1 43 mm from the bottom of the tank place the cover in position and plug in the electric cord The following precautions must however be noted There must always be liquid in the stainless steel tank when the Ultrasonic Unit is in operation When filling the stainless steel tank do not exceed indicated levels The Ultrasonic Unit should never be immersed in water To clean simply rinse with tap water and wipe dry A certain amount of heat is generated during ultrasonic scrubbing Do not become alarmed if the bottom surface or the water become quite warm MAINTENANCE Clean out and dry the equipment thoroughly after use 11 RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER amp UL
91. minute settling period has elapsed switch it off fill the syphon tube with water place a finger over the end of the straight section and insert the curved section into the beaker Remove finger and syphon clay water suspension out of the beaker Fill the beaker to the top line with distilled water stirring the sediment on the bottom and allow to settle for a second 10 minute period Syphon off the suspension when the alarm indicates that the 10 minute settling time has elapsed Refill to the top line allow to settle for 5 minutes and syphon off the suspension Repeat the process of 5 minute standing and syphoning until the water is clear at the end of a 5 minute settling period Syphon off the clear water and decant as much of the remaining water as possible without losing any sand grains RIDSDALE DIETERT RAPID SAND WASHER Type N cont d IV Vi TEST PROCEDURE cont d n Place the beaker in an oven at 105 C 110 C and dry the sand grains Transfer the sand grains from the beaker to a suitable balance using the brush provided Weigh and subtract the weight obtained from the original weight of dry sand Divide this weight by the original weight of dry sand multiply by 100 and express as percentage AFS clay MAINTENANCE Dry the unit thoroughly after use RECOMMENDED SPARES Part No N 1002 N 1003 N 1004 N 1005 N 1006 N 1007 N 1008 N 1009 N 1010 N 1011 Description Agitator Disc complete with Screw
92. nder test air can only pass between the flat faces Two small one way air valves in the body of the tube enable the operator to inflate and deflate the rubber seal without removing the hand pump each time The dimensions of the Core Permeability Tube allow it to be used on either the Standard Permeability Meter or the Electric Permmeter TEST PROCEDURE a Insert the specimen carefully into the Core Permeability Tube and position so that the flat faces are equidistant from either end of the rubber lining b Attach the hand pump and gently inflate the rubber lining until the specimen is gripped firmly DO NOT OVER INFLATE c Transfer the tube to the Permeability Meter and determine permeability in the usual way d Remove the specimen by releasing the air through the second valve 74 CORE PERMEABILITY TUBE cont d IV RECOMMENDED SPARES Part No 9275 4060 0592 0422 0592 0423 Description Rubber sleeve Valve Hand pump 75 BASE PERMEABILITY SCREENS The base permeability is a standard comparison of permeability with zero water and zero clay It compares all sands on an equal basis TEST PROCEDURE Place a Base Permeability Screen in the end of the specimen tube so that the flange faces upward when the tube is seated in the pedestal cup Either weigh or measure the proper amount of dried clay free sand to give a 2 inch 50 mm length rammed specimen Before ramming place the second Screen in the spe
93. ned steel sheet This is suitable for all materials except very fine powders Additional items include an aluminium cooling stand for rapidly cooling the sample in the pan and a pair of special tongs for handling hot pans INSTALLATION a This instrument is designed to operate on a standard 3 ft 1 m high laboratory bench If the bench has a wooden surface it is desirable to stand the blower unit on a sheet of insulating material to prevent any possible damage to the surface if it is operated without the sample in position b Connect to an appropriate power supply see label for correct voltage and frequency using the moulded plug and 2 metre lead which are supplied c Rotate time switch knob clockwise and check that the blower motor is rotating freely and that warm air is blown out of the base of the unit when the instrument is cold it will take about one minute to warm up It is important to ensure that the blower is forcing air over the heating element when the power is on There must be an unrestricted flow of air into the blower unit TEST PROCEDURE a Set the thermostat to the required drying temperature Suitable settings for various materials are given below Thermostat Setting Time Sand gravel etc 7 2 minutes Yarn 3 5 minutes Gelatin 2 12 minutes Coal 6 6 minutes Sinter crushed 6 4 minutes Soap Powder 5 6 minutes Metal Powder 5 4 minutes Salt 5 6 minutes Hay 5 15 minutes Milk dried 4 10 minutes Coconut s
94. netic rider is resting against the pusher arm and that there is inch clearance between the rubber bumper and the lug on the weight arm Apply the load uniformly until the specimen shears Read the lower edge of the magnetic rider on the scale designated Green Shear Remove the sheared specimen as under A Green Compression Strength section f Dry Compression and Dry Shear Strengths a b c d e f Place either the compression heads or the shear heads in the top position of the machine This position increases the load applied by a factor of 5 Prepare AFS standard 2 inch diameter x 2 inch height test specimens in the usual way and dry in an oven at 110 C for 2 hours When cool place in position between test heads and adjust clearance between rubber bumper and lug on weight arm to approximately inch using the adjusting screw in the pusher arm Apply the load as for Green Compression and Green Shear until the specimen collapses Read the scale designated Dry Compression or Dry Shear according to the test heads being used Remove the broken specimen as under A Green Compression Strength section f 84 RIDSDALE DIETERT HAND OPERATED UNIVERSAL SAND STRENGTH MACHINE AFS cont d V VI MAINTENANCE Keep the machine clean removing surplus sand and pieces of broken specimens with a soft brush after each test Oil the hand wheel shaft once a m
95. ng the knurled ring in a clockwise direction 114 RIDSDALE GAS DETERMINATOR GENERAL PRINCIPLES This method of determining the gas content of sands depends upon the introduction of a weighed sample into a heated tube filled with an inert gas and measurement of the increase in pressure due to the gas evolved from the sample Pressure readings are converted to volumes by means of a calibration graph prepared at the operating temperature The tube is heated in a furnace with an inclined heating chamber which ensures that the evolved gases remain in the hot zone and only the inert gas passes into the pressure recorder DESCRIPTION A fused silica tube 18 in long x 2 in outside diameter sealed at one end is heated by means of a thermostatically controlled electric furnace The open end of the tube is fitted with a water cooled metal closure to which is attached a spring gun assembly the latter containing a trigger mechanism designed to eject the sample into the hot zone of the tube An inconel tube which extends to the closed end of the silica tube is fitted to sweep the apparatus out with nitrogen which is supplied from a cylinder via a pressure reducing valve A further tube connects the interior of the silica tube to the pressure recorder The metal closure is secured to the silica tube with high melting point wax hence WATER MUST ALWAYS BE PASSING THROUGH THE COOLING JACKET WHEN THE TUBE IS HOT ie when the furnace temperat
96. nvil cap on top of the support Set the machine on a solid floor Remove the chromium plated dome nuts covering the two adjustable feet at the front of the base casting and level carefully by means of the adjustable feet using the spirit level on the base or a plumb line Lock the feet in position with the dome nuts TEST PROCEDURE a b c e Prepare an AFS Standard 2 inch diameter specimen in a precision specimen tube and record the weight of sand used to form the specimen Position the tube containing the sand specimen in the ejector mechanism beneath the plunger with the specimen in the lower part of the tube Pull the handle of the mechanism downwards slowly and evenly so that the plunger enters the specimen tube and ejects the sand specimen without giving it any downward impetus The sand specimen should strike the anvil squarely in the centre If it does not check that the base is set level Remove anvil cap carefully lift off sieve assembly and remove sieve from pan 78 RIDSDALE SHATTER INDEX TESTER AFS cont d IV VI VII TEST PROCEDURE con d f For convenience weigh the sand in the receiver and calculate the weight of sand remaining on the sieve including the cone of sand on the anvil cap by subtracting this weight from the total weight of the specimen Shatter Index Wt of sand remaining on 13 2 mm mesh sieve x 100 Total wt of sand specimen INTERPRETATION OF RESULTS The S
97. obe graduated in one centimetre divisions attached to a hand operated spring loaded hammer mechanism for subjecting the probe to a series of blows of equal impact The knurled knob on the end of the body of the instrument can be turned to alter the spring loading on the hammer to suit different requirements TEST PROCEDURE Before screwing in one of the two probes give the hammer mechanism a few operations with the knurled knob in the fully extended position turn anti clockwise by pressing it against a rigid surface to ensure freedom of the mechanism NOTE To prevent damage to the probe holder use a wooden surface 127 RIDSDALE IMPACT PENETRATION TESTER cont d TEST PROCEDURE cont d a Screw one of the two probes firmly into the probe holder at the end of the instrument b If the mould or core to be tested is expected to be very hard turn the knurled knob clockwise as far as it will go to give maximum spring pressure on the hammer Should the mould or core be relatively soft the knurled knob should be turned anti clockwise until it is in the fully extended position to give the minimum spring pressure on the hammer By turning the knurled knob one full rotation until the index mark is in line with the longitudinal line on the body of the instrument any one of five intermediate positions can be selected This means that the instrument may be readily reset to a pre determined spring pressure between minimum and maximum
98. of clay present and the dispersed and working clay ie the clay that is in the proper form to contribute to the strength of a mould The process for determining this dispersed live clay is exactly the same as for total live clay as described in B above except that the Ultrasonic Accessory is not used at all Thus the procedure is exactly the same as per B above except that instead of carrying out the instructions per B c and B d the contents of the stainless steel beaker are merely stirred for 2 minutes prior to methylene blue titration The dispersed live clay is calculated by dividing the number of ml of methylene blue to reach end point by this means by the calibration factor as in A above 10 RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d IV 1 2 3 TEST PROCEDURE cont d D Testing Incoming Material a If the same test procedure as used for the determination of calibration factor is used as per Section A above the methylene blue requirement for incoming material is readily established This can act as a useful means of checking for possible variation in the nature or in the proportion of constituents in the incoming material By using the different retention factors of base exchange capacities after firing at 540 C for example calcium bentonites have a much lower MB requirement after firing than do sodium bentonites further information about the composition of incoming
99. om of the container 132
100. on 101 RIDSDALE DIETERT SHELL MOULD TENSILE ACCESSORY AFS cont d ll TEST PROCEDURE cont d WITHOUT DELAY f Place the strike off edge along the longitudinal centre line of the mould and holding it perpendicular to the mould surface strike off the excess sand from the centre line outwards first from one side then the other g Place the filled mould in a suitable oven or enclosed stove for the appropriate time h Remove the specimens from the mould and allow to cool to room temperature Check the thickness 1 4 inch of the specimens before testing i Ensure that the inserts have been fitted in the Tensile Core Strength Accessory in order to centralise the Tensile Shell specimen ii The Shell Mould Tensile specimens can be tested on the Universal Sand Strength Machine Read the Dry Shear scale and multiply by 20 to convert to psi to allow for the thinner specimens NOTE It is important to remove the surplus resin bonded sand before sufficient heat has penetrated through the split moulds to cause the surplus sand to coagulate and score the surface of the specimen when strickled off IV MAINTENANCE Remove any adhering sand from former plates after use V RECOMMENDED SPARES Part No Description 1601 RH Former Plate Supplied in pairs only 1602 LH Former Plate 102 RIDSDALE SPLITTING STRENGTH ACCESSORY AFS for use with the Hand Operated Universal Sand Strength Machine GENERAL
101. onth by means of the spring loaded oiler located at the top of the gear box behind the hand wheel Lightly grease the path of the hand wheel brake pad from time to time to ensure smooth operation whilst loading the specimen The mainshaft ball journals and the gear box of the pusher arm are pre packed with grease and require no attention The gear rack should be free from grease to prevent sand sticking to it It is important that the rubber bumper is in good condition to absorb the shock when the specimen breaks and thus prevent damage to the gears Replace when it has worn down to inch thickness RECOMMENDED SPARES Part No Description 403 Adjusting screw pusher arm 404 Ball journal mainshaft weight 406 Levelling screw main frame 409 Gear rack main frame 410 Scale main frame 411 Magnetic rider scale main frame 412 Pusher plate weight 413 Rubber bumper pusher arm 414 Handwheel 415 Felt washer handwheel 417 Drive pinion gear box pusher arm 421 Brake spring handwheel 422 Compression heads pusher arm weight 424 Rack pinion gear box pusher arm 425 Reduction gear gear box pusher arm 426 Pad brake spring handwheel 85 RIDSDALE DIETERT MOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE AFS q GENERAL PRINCIPLES The Universal Sand Strength Machine together with the appropriate accessories will determine the compression shear tensile
102. or disconnected from the electrical supply see below The ends of the runners should be inserted into the vertical columns of holes simultaneously at the front and the back The bar should then be rotated through 90 in a downwards direction to secure it in place The shelves slide onto the runners such that the spurs on the lower side of the shelf are under the bar this prevents the shelf from tilting forwards when partially withdrawn 56 RIDSDALE LABORATORY CORE BAKING OVEN MODEL PF 60 cont d l GENERAL PRINCIPLES cont d b Electrical Connections Connection by a qualified electrician is recommended The Ridsdale Laboratory Core Baking Oven is supplied for use on single phase 220 230V AC supply Check that the supply voltage is compatible with the voltage on the label and that the current capacity is sufficient for the amperage on the label before connection to the supply The oven is supplied complete with a 13 amp moulded plug and lead A supply rated fuse is internally fitted ll OPERATING INSTRUCTIONS a Operating Cycle The Ridsdale Core Baking Oven is fitted with a combined supply light and instrument switch The light will be on whenever the oven is connected to the supply The switch cuts off power to the controller The fan assisted circulation will operate when the instrument switch is switched on Connect the oven to the electrical supply The supply light should glow Operate the instrument sw
103. ot interfere with normal ramming procedure 43 RIDSDALE DIETERT FLOWABILITY INDICATOR AFS cont d TEST PROCEDURE cont d a b c Rotate the Flowability Indicator out of position and prepare an AFS standard 2 inch diameter test specimen of moulding sand with three drops of the rammer weight Ram with a fourth drop of the weight and set the Indicator into position so that the ball point of the stem comes in contact with the plunger of the rammer Set the bezel of the Indicator to read zero Ram a fifth time and record the reading on the Indicator as percentage Flowability If the plunger does not descend any further this indicates that the sand has flowed as far as possible with the initial four rams hence the flowability is 100 The further the plunger descends on the fifth ram indicating incomplete initial flow the lower the percentage flowability Before removing the sand specimen tube rotate the Indicator backwards out of position 44 RIDSDALE DIETERT COMPACTABILITY TESTER GENERAL PRINCIPLES The compactability test is carried out in conjunction with a Sand Rammer This test measures the decrease in height of a riddled mass of sand 4 inches 120 mm high under the influence of a standard compacting force By this means the degree of temper of a sand can be measured and the water requirements determined DESCRIPTION The Compactability Tester consists of a scale graduated 0 65 in
104. pplied to the sand specimen exactly midway between the supporting knife edges 95 RIDSDALE DIETERT TRANSVERSE CORE STRENGTH ACCESSORY FOR USSM AFS cont d Hl INSTALLATION a Attach the support arm with the two knife edges to the pusher arm and the arm with the single knife edge to the pendulum weight arm of the Universal Sand Strength Machine by means of the bolts and washers provided NOTE Hand Operated Universal Motorised Universal IV TEST PROCEDURE for hand operated universal machine when fitting the transverse core strength and transverse shell strength accessory the 1 bolt will be substituted with a 17 bolt secure the left hand part of the accessory with a 174 long x BSW bolt plus collar in the top position and a 1 x Y BSW bolt with a flat washer in the bottom position The right hand part of the accessory will be secured with a x BSW bolt with a stepped collar in top and bottom positions a Insert the core specimen between the arms as shown in the illustration carefully avoiding any scoring the specimen by the knife edges b Apply the load in the recommended manner until the specimen breaks c Read the Dry Shear scale direct in pounds load supported by the core V RECOMMENDED SPARES Part No Description 2005 Stepped collar BSW is British Standard Whitworth thread 96 RIDSDALE DIETERT TRANSVERSE SHELL STRENGTH ACCESSORY FOR USSM AFS
105. rder cores three or more revolutions should be employed and for very weak cores it may be desirable to use only one revolution The number of revolutions should be recorded along with the hardness value 125 RIDSDALE DIETERT CORE HARDNESS TESTER cont d IV METHOD OF CALIBRATION Press the Core Hardness Tester against a hard flat surface and note the dial reading The unit should read 100 If the reading is incorrect check for sand grains or a burr on the anvil plate which would cause the error If the surface is clear and the reading is still incorrect loosen the indicator bezel clamping screw while holding the tester firmly against the hard flat surface and turn the bezel to obtain a reading of 100 Re tighten the clamping screw V RECOMMENDED SPARES Part No Description 1301 Four point penetrator 126 RIDSDALE IMPACT PENETRATION TESTER GENERAL PRINCIPLES This instrument will determine the safe stripping time for moulds and cores made from cold self hardening sand mixtures and measure the sub surface strength of CO2 silicate moulds and cores A graduated probe is driven into the mould or core by a series of blows of equal impact The number of blows required to cause a given penetration of the probe can be related to the sub surface hardness of the material being tested harder layers requiring more impacts to cause an equivalent depth of penetration DESCRIPTION The instrument consists of a pointed hardened steel pr
106. removed from the blowing head fixed to the raising and lowering rack by turning in an anti clockwise direction The nozzle is detachable and has an inner recess for holding a removable rubber slotted valve which is used when blowing shell moulding sands No 7 Die Positioning Screw This screw is used in conjunction with the die clamping lever and backstop to adjust the position of the die centrally beneath the sand magazine nozzle No 8 Die Clamping Lever This lever releases or clamps the side plates of the die by a backward or forward movement No 9 Die Heater Plates These plates form the side walls of the die cavity and contain electrical heater elements The temperature of the plate is controlled by the temperature controller DESCRIPTION OF DIES Dies for Producing Hot Cured Test Pieces The die consists of a frame having an insulated handle and is inserted directly between the heater plates After blowing the test piece the die is removed and the test piece stripped from it by pressing it on to a suitable stripping post 60 RIDSDALE LABORATORY CORE TEST PIECE BLOWER cont d IV NOTE NOTE SETTING UP READY FOR USE The blowing machine must be firmly fastened to a strong level bench top so that it cannot be pulled over during the operation of opening and closing the die As an alternative to fastening to the bench top the machine can be bolted to a strong base board at least 750 mm square Connect
107. rse Test Specimens cont d c Place the Gassing Accessory onto the core box Holding the Gassing Accessory core box and drying plate firmly together invert the assembly Remove the drying plate d Gas for 60 second at a flow rate of 5 litres min This gassing time and flow rate serves only as a general guide as different binders and sand mixtures will require various times and volumes of gas to develop optimum strengths V MAINTENANCE Remove sand grains from gas passages by blowing out with clean dry compressed air VI RECOMMENDED SPARES Part No Description 354 Rubber sealing washer for compression accessory 352 Securing screw for tensile accessory 346 Rubber sealing washer for tensile accessory 55 a RIDSDALE LABORATORY CORE BAKING OVEN MODEL PF 60 GENERAL PRINCIPLES Unpacking amp Handling Remove the shelves and runners from the packaging before attempting to move the equipment Lift the unit by its base The door should not be used to support the equipment when moving it Use two people to carry the oven where possible Remove any packing material from the inner chamber before use Place the oven on a level surface If over temperature protection is not fitted ensure that the unit can be directly observed Ensure that there is free space behind the oven There are vents in the back which must not be obstructed Ensure that the oven is placed in such a way that it can be quickly switched off
108. rt a prepared AFS 1 inch thick central section standard tensile specimen into the jaws of the accessory as follows Raise the pendulum weight arm slightly allowing the jaws to butt together and place the specimen carefully in position without scoring it Adjust the fulcrum screws so that a clearance of approximately 1 inch is obtained between the rubber bumper on the pusher arm and the bottom lug on the pendulum weight arm NOTE After adjustment the jaws must be free to swivel on the end of the fulcrum screws REMOVE THE GUIDE PINS Apply the load in the recommended manner until the specimen breaks Read the Dry Shear scale and multiply the reading by 5 to give tensile strength in wD Ib in V RECOMMENDED SPARES Part No Description 2901 Guide pin 2902 Adjusting screw 1906 Fulcrum pin 94 RIDSDALE DIETERT TRANSVERSE CORE STRENGTH ACCESSORY FOR USSM AFS l GENERAL PRINCIPLES This accessory provides a means of applying a transverse load to an AFS 1 inch x 1 inch x 8 inch long transverse specimen of baked or cured core sand ll DESCRIPTION The cast aluminium support arms are fitted with hardened steel knife edges two self aligning knife edges 6 inches apart in the left hand arm and one fixed knife edge in the right hand arm When fitted to the Universal Sand Strength Testing Machine the single knife edge is positioned midway between the two self aligning knife edges and as a result the load is a
109. sing the orifice method 64 RIDSDALE DIETERT PERMEABILITY METER AFS cont d INSTALLATION a b c d e f Place the Permeability Meter on a level bench and fill tank with water to WATER LEVEL mark Rotate knurled ring clockwise and remove the aluminium cover from the centre post Open priming cup and pour distilled water into it until the water appears in the glass tube below line O Any initial resistance to the entry of the water can be overcome by pressing the ball of the thumb on the open end of the priming cup Close the tap With the manometer scale on the dial in the vertical position turn the adjusting screw until the zero on the dial is level with the water in the manometer tube Turn air valve to VENT and raise air drum until it is above the water level Turn valve to CLOSED and allow the drum to descend slowly into the water Turn the air valve gradually towards VENT and allow the air drum to descend until the X mark on the drum is level with the top edge of the tank Turn valve to CLOSED Place the aluminium cover on the centre post and form an air tight seal by rotating the knurled ring in an anti clockwise direction Turn the air valve to a position midway between CLOSED and VENT The water level in the manometer should now read 10 0 cm pressure and remain steady If the drum should descend this would indicate air leaks in the system The addi
110. ssible damage Readings are empirical and bear no direct relationship to any definite pressure per unit area They are however valuable for comparative purposes 124 RIDSDALE DIETERT CORE HARDNESS TESTER GENERAL PRINCIPLES This instrument is used to determine accurately the surface hardness of cores The surface of the core is subjected to controlled abrasion by a four point penetrator and the depth of penetration measured on a horizontally mounted dial gauge DESCRIPTION It consists of a probe or penetrator which can be rotated by means of an external knurled ring indexed so that the number of rotations can be counted and a horizontally mounted dial gauge which measures the depth of penetration of the probe TEST PROCEDURE a b c Hold the curved section of the tester body with the thumb and forefinger Turn the knurled index ring assembly until the line on the index ring is opposite the reference line on the housing projection Do not move the dial indicator bezel Press the base of the instrument firmly against the core and rotate the ring assembly clockwise through two revolutions until the lines are again matched Read the hardness directly from the indicator As long as the reference lines are together no further resetting of the unit is required for the next test For routine testing two revolutions may be considered as the standard procedure To increase the sensitivity of the instrument when testing ha
111. tandard 2 inch diameter x 2 inch height test specimen between the compression heads so that the face that was uppermost in the ramming operation is facing the right hand compression head Care should be taken not to damage the specimen See that the magnetic rider is resting against the pusher plate and that there is at least inch clearance between the rubber bumper and the lug on the weight arm If this clearance is not sufficient it means that the specimen is smaller than the permitted tolerance and should be discarded Apply a load to the specimen by turning the hand wheel at a uniform rate approximately 7 5 psi green compression in 15 seconds until the specimen collapses Record the reading shown on the lower edge of the magnetic rider reading the scale designated Green Compression Strength Return the weight to zero by reversing the rotation of the hand wheel Remove the sand from the compression heads This loading rate applies to all tests on the machine 83 RIDSDALE DIETERT HAND OPERATED UNIVERSAL SAND STRENGTH MACHINE AFS cont d IV TEST PROCEDURE cont d B C Green Shear Strength a b c e f Place the shear test heads in the lower position in the machine with the head having the half round holder attached to it in the pusher arm Raise the weight arm slightly and insert an AFS standard 2 inch diameter x 2 inch height specimen between the heads Ensure that the mag
112. tandard sand specimen allowing approximately 1 16 1 5 mm clearance Place the specimen between the compression heads replace the Perspex safety cover Before commencement of the test ensure that the cursor is displayed on the left hand bottom corner of the cypher display To adjust the cursor repeatedly press the max min button For compression testing select Mode 2 button on the cypher Zero the display on the cypher using the reset and zero buttons To test press one of the direction of travel buttons If using the software package press F4 simultaneously Once the specimen has broken press the stop button and remove the remains of the previous test piece Repeat from Procedure a to carry out further tests 106 RIDSDALE TENSILE CORE STRENGTH ACCESSORY FOR HIGH STRENGTH TESTING MACHINE vw INSTALLATION a b c d Press one of the direction of travel buttons on the cypher to obtain sufficient clearance to insert the tensile jaws Screw in the tensile jaw carriers one into the load cell a the other into the traversing ram b DO NOT TIGHTEN With back plate on the bottom of the accessory put the locating pins through both halves With the locating pins in position ensuring the accessory is in line with the support rods tighten the tensile core strength carriers using the back nuts with the spanner provided TEST PROCEDURE a
113. te correctly with at least 3 4 liquid level This is important especially with heated models where the heaters are mounted on the lower bath sides If the liquid level falls below full the heaters will be damaged and the warranty will be void A lid will prevent liquid loss by evaporation and reduce fumes from certain cleaning fluids Do not allow items to come into contact with the base of the bath Damage will occur to the base due to the high frequency vibrations and the transducers can be damaged Suspend the items to be cleaned or use a basket instrument tray or glass beaker Stainless steel baskets beaker support trays and hard glass beakers are available accessories After filling the bath with warm water and a 2 addition of detergent or recommended cleaning fluid advance the timer to the required cleaning time The timer can be set for a maximum of 15 minutes In practice most items will be cleaned in less than 5 minutes The unit should be switched off when not required this will prolong the transducer life Gases are present in a first fill with water from the tap Cavitation the appearance of cold boiling will only occur when the gases have been driven out of the solution The period taken to degas the fluid varies Generally less than two minutes will see cavitation taking place Once the solution is degassed the bath is always available for immediate use 14 INSTRUCTIONS FOR THE CORRECT USE OF ULTRASONIC CLAY T
114. the Methylene Blue Clay Tester and Ultrasonic Accessory are shown in Fig i and in the spares parts list in Section VI RIDSDALE DIETERT METHYLENE BLUE CLAY TESTER AND ULTRASONIC ACCESSORY cont d DESCRIPTION cont d The heavy metal base is designed to accommodate in as compact an area as possible the self filling burette system stainless steel beakers and motor stirrer unit The ancillary equipment such as repeating pipettor tetrasodium pyrophosphate methylene blue solution filter papers glass rod vaseline and Allen wrench and the Ultrasonic Accessory completes the list of items required to determine the live clay in a foundry sand system INSTALLATION a b c d e f Drop the reduced end of the post into the hole in the base until the bottom of the post is flush with the bottom of the support collar Tighten set screw with Allen wrench provided Attach one clamp holder to the post allowing approximately 8 200 mm from the base to top of the clamp Attach clamp so that the thumbscrew points to the front of the base Refer to Fig i for proper placement of all clamps Attach one burette clamp to the post approximately 2 50 mm from the top of the first clamp Attach clamp so that the portion of the clamp which holds the burette points to the front of the base Attach the other clamp holder to the post approximately 3 75 mm from the top of the second clamp Attach clamp so that t
115. then check the adjustment nut at the back of the stopcock in the burette This nut should be tightened just enough to make the stopcock slightly resistant to turning If the stopcock is too loose there is a possibility of methylene blue leaking around the core Do not overtighten the adjusting nut as this will make the stopcock too difficult to turn and may result in the burette twisting inside the clamps Gather the two hoses as neatly as possible at the rear of the upright post and hold them using the hose clamps provided Position the stopcock handle so that the stopcock is closed Carefully pour one bottle of the methylene blue into the amber one litre solution bottle Use the rubber stopper with the glass vent tube to close the opening at the top of the bottle to prevent dust from contaminating the methylene blue solution Locate the small tubing clamp and slip it over the rubber tubing leading to the inlet at the bottom of the burette This clamp should slide over the tubing but at this time do not restrict the tubing This clamp is provided as a secondary shut off in case the stopcock should leak Carefully turn the stopcock handle until the burette is filled Watch the methylene blue as it rises in the burette Close the stopcock when the methylene blue first spills out of the overflow tube at the top of the burette If an air lock develops in the rubber tubing from the solution bottle squeeze the tubing with a pumping motion to remove t
116. tion Legend Plate Base Retaining Sleeve Sealing Sleeve Burette Holder Retaining Washer Burette Volumetric tube Pyrex Levelling Tube Support Tube Assembly includes 9 amp 10 Plastic Tubes includes A B amp C Rubber Sleeve Filter Burette Knurled Screw Rubber Tube Adapter Jam Nut Bulb Support Bulb Cradle Assembly Orifice Levelling Screw Washer Drain Elbow Glass Tube Connector Level Rubber Bulb Valve Rubber Tubing SAND SPECIFIC SURFACE TESTER mA AP RMP MP mm pH fm AM SM SB BM SB MP BM MP mma AahNhd HH H Z e D 22 SAND SPECIFIC SURFACE TESTER FIG 1 23 RIDSDALE LABORATORY MILL GENERAL PRINCIPLES This is a stationary pan mill with rotating rollers for milling and mixing experimental batch of moulding and core sands DESCRIPTION A hp motor drives the roller and scraper assembly at a speed of 30 rpm through a reduction gearbox It is controlled by a push button switch The rollers may be raised or lowered by means of two jacking screws to suit various quantities of sand being milled and the scrapers are adjustable to allow for wear Water additions to the sand are made from a central tundish feeding two sprinkler arms which distribute the water e
117. tion of a 16 bit micro processor indicator reading in psi Compression tensile and transverse tests can be carried out on this machine up to a maximum capacity of 1450 psi 20 kN The accessories are easily inserted into position and the range selected on the cypher Please see separate Instructions Manuals for detailed operation of accessories INSTALLATION Set the machine and control panel housing the cypher onto a rigid bench and connect in turn the various power cables which are easily identifiable into the back of the control panel Connect to the main power supply and the machine is ready for use MAINTENANCE Keep the machine clean removing surplus sand and pieces of broken specimens with a soft brush after each test 105 a b c RIDSDALE COMPRESSION STRENGTH ACCESSORY FOR HIGH STRENGTH TESTING MACHINE INSTALLATION Press one of the direction of travel buttons on the cypher to obtain sufficient clearance to insert the compression heads Screw in the compression head carriers one into the load cell a the other into the traversing ram b Push the compression heads into the locating holes in the compression head carriers ensuring the sample supports are positioned at the bottom to accept the specimens TEST PROCEDURE a b c e f h Using one of the direction of travel buttons on the cypher adjust the distance between the compression heads to accommodate a s
118. tion of a small amount of detergent will facilitate the filling of the manometer tube TEST PROCEDURE DIN Standard Time and Pressure Method a b c d e Check that the open orifice is in position in the centre post Prepare a standard specimen of sand Before stripping from tube place in position on the centre post and seal by rotating the knurled ring anti clockwise Raise the air drum as in Section IIl paragraph d Allow the air drum to descend by turning the air valve to a position midway between CLOSED and VENT Time the descent of the air drum between the zero and the 2000 ml mark with a stop watch and record the pressure indicated on the manometer during the descent of the drum Calculate the permeability by applying the formula given in Section I 65 RIDSDALE DIETERT PERMEABILITY METER AFS cont d Routine Method using calibrated orifice a Select the orifice that will give as large a pressure reading as possible Use the small orifice for permeability values below 36 and the large orifice for permeability values above 36 b Screw the appropriate orifice into the air outlet pipe in the centre post Tighten firmly onto the rubber washer using the fingers only c Raise the air drum as in Section Ill paragraph d and place the specimen and tube in position on the centre post Seal by rotating the knurled ring anti clockwise Allow the air drum to descend by turning the air valve
119. to a position midway between CLOSED and VENT and either i Record the pressure on the manometer and refer to the table for the Permeability number or ii Rotate the transparent scale until the line on the circumference cuts the meniscus of the water in the manometer and read the permeability direct If the small orifice is used read the outer scale on the dial and if the large orifice is used read the inner scale V MAINTENANCE AND METHOD OF CHECKING CALIBRATION The instrument should be kept clean at all times and sand dirt or water should not be allowed to enter the air outlet pipe in the centre post This can be achieved by keeping the aluminium dust cover in position on the centre post whenever the instrument is not in use If it is suspected that sand or water etc has entered the air passages of the instrument empty the manometer tank by removing the small screw just below the manometer tube empty the large water tank and remove the small screw at the bottom of the centre post Blow clean dry air through the system and if necessary remove the clear PVC pipes and dry them Replace pipes and screws and refill water tanks To check the calibration of the instrument allow 2000 ml of air to pass through each orifice in turn The large orifice 1 5 mm should allow 2000 ml of air to pass through it in 30 s 0 3 s and the small orifice 0 5 mm should allow 2000 ml of air to pass through it in 4 min 30 s 1 35 s This
120. transverse and splitting strengths of moulding and core making materials by means of dead weight loading DESCRIPTION This machine consists of four major parts frame pendulum weight pusher arm and motor The pusher arm is driven by a geared motor mounted on the pusher arm and coupled to the handwheel shaft The pendulum weight swings on ball bearings and can be moved by the pusher arm via a test specimen from a vertical position through 90 to a horizontal position with a consequent increase of load on the test specimen A magnetic rider is moved up a calibrated scale by the pendulum weight and indicates the point at which specimen collapse occurs The machine is calibrated in lb in for 2 inch diameter x 2 inch height standard sand specimens 86 RIDSDALE DIETERT MOTOR DRIVEN UNIVERSAL SAND STRENGTH MACHINE AFS cont d DESCRIPTION cont d Automatic operation is by means of push button stop start control and micro switches as follows a b c Reverse switch This reverses the machine after the specimen has collapsed Stop switch This stops the machine when it returns to the zero position Limit switch This comes into operation if the specimen fails to collapse returning the pusher arm automatically to zero The accessories required for the determination of shear dry tensile transverse and splitting strengths are described separately INSTALLATION a b c d e f Set the
121. ts penetration has a hardness reading of 100 DESCRIPTION The tester has a dial gauge calibrated in thousandths of an inch which is operated by a spring loaded probe of 4 radius The dial bezel can be rotated and the pointer held in any position by pressing the locking button The instrument can be carried in the pocket and is most useful for checking the degree or uniformity of ramming of a mould TEST PROCEDURE a Press the Hardness Tester down on to a hard flat surface until the anvil plate which surrounds the probe makes even contact with the surface Slacken the clamping screw and turn the milled bezel until the pointer reads 100 Re clamp the bezel b Press the tester firmly down on to any flat surface of a mould until the anvil plate is in contact with the mould surface The penetration of the probe into the mould surface is registered on the dial and is read direct as Green Hardness B Scale 121 RIDSDALE DIETERT GREEN HARDNESS TESTER B SCALE cont d TEST PROCEDURE cont d c d e f When testing in places where the dial cannot be seen easily hold the pointer in the test position by pressing the locking button on the front of the tester Remove the instrument from the mould and take the reading The pointer is released ready for the next test by pressing the button on the back of the tester while holding the thumb on the probe to prevent the sudden return of the pointer to zero
122. tured in Great Britain to BS EN ISO 61010 2 to conform with British and IEC electrical safety standards and the requirements of the Electrical Safety Code for Hospital amp Laboratory Equipment ESCHLE The warranty will be invalidated if the bath is subjected to improper treatment or misuse If the unit stops working check the indicator when switched on If the indicator fails to glow check the mains supply and fuse in the mains plug There are no user serviceable parts inside the bath If after the above checks the unit fails to operate it should be returned to your supplier for exchange or service For further information see also the manufacturer s instructions 15 RIDSDALE DIETERT SAND SPECIFIC SURFACE TESTER PROCEDURE 1 2 3 4 Remove the unit from the packing case place it on a work bench and level the tester base using the knurled screws 22 so that the level 053 bubble is centred The burette 6 and burette knurled screw 15 should be checked to ensure that the burette has not loosened in shipment The burette should be in contact with the screen at the bottom of the burette holder Tighten the jam nut 17 by hand so that the burette is held firmly in the rubber sleeve 13 Place the valve handle in the TEST position and add kerosene to open left hand levelling tube 8 Continue adding kerosene until the level in the right hand volumetric tube 7 almost reaches the lower black
123. umber of the sample is over 50 use the large orifice marked L ii If the permeability number of the sample is under 50 use the small orifice marked S c Place the specimen tube with the sand sample uppermost over the centre post of the permmeter d Rotate the knurled ring of the centre post anti clockwise to seal the specimen tube e Place the lever on the left hand side of the permmeter body in the CHECK forward position f Adjust the motor speed control rheostat to obtain a pressure reading of exactly 100 mm or O permeability on the pressure gauge g Move the lever to the TEST rear position and read permeability from the appropriate scale according to the orifice in use h Return lever to its CHECK position and confirm that a pressure of 100 mm is still recorded i Release the specimen tube by rotating the knurled ring in a clockwise direction CALIBRATION AND MAINTENANCE This instrument can only be calibrated by comparison with sands of known permeability However to check that the instrument is working correctly and that the orifices have not been damaged or blocked it is supplied with two check jets Each of these check jets is mounted in a rubber bung which can be placed in the end of a specimen tube The check jet marked 150 should be used for testing the large orifice and the check jet marked 15 for testing the small orifice The tube with the bung in one end is p
124. ure is over 200 C It is recommended that oxygen free white spot nitrogen be used as commercial grade nitrogen may contain a trace of oxygen which would give false readings 115 a RIDSDALE GAS DETERMINATOR cont d INSTALLATION Services Place the silica tube in the furnace and connect the polythene tubes to the appropriate points on the side of the console making sure that i ii the WATER SUPPLY goes to bottom of the cooling jacket and the WATER DRAIN to the top the GAS SUPPLY goes to the inconel tube which runs the full length of the silica tube and the GAS EXHAUST to outlet point Connect the appropriate services to the three nipples at the bottom left hand side of the unit marked WATER SUPPLY GAS SUPPLY NITROGEN and WATER DRAIN Connect the flexible cable to an appropriate power supply and earth see furnace manufacturer s label for loading correct voltage etc Chart Recorder Loading To swing out for loading the chart raise the extreme left hand end of the unit with the forefinger and pull forward i ii iii iv v vi Raise the top black chart spool holder which is spring loaded sufficiently to allow it to turn and lock in the open position Repeat for the lower holder which is located on the underside of the unit Place the chart roll in position and turn the holders until they drop back into place Take the fr
125. venly throughout the mix A safety grill is hinged to the top of the pan fitted with a cut out switch should the grill be raised A sliding door in the bottom of the mill allows easy discharge of the contents whilst the mill is in motion 24 RIDSDALE LABORATORY MILL cont d INSTALLATION a b c d NOTE e f g h i Set the mill on a strong level bench or plinth about 45 cms high Secure in position using the four lugs on the base casting Remove the level plug stamped L located on the side of the gearbox beneath the mill pan Fill the gearbox with CASTROL ALPHA 617 or equivalent gear oil through the level hole using an oil gun or funnel and flexible pipe Replace the level plug The drain plug is located below the level plug and stamped D Connect to appropriate power supply see motor nameplate for correct voltage and frequency Check that the scraper clamping bolts are secure and ensure that the scrapers are not fouling at any point by revolving motor shaft by hand Place the wire guard in position over the pan and start motor by means of the push button switch Observe the setting of the scrapers and see that there is free movement of all working parts Stop motor by pushing red STOP button TEST PROCEDURE a b c d e f g h i NOTE Raise the wire guard and place 1 kg 3 5 kg 2 Ib 8 Ib of sand in the mill wit
126. with this machine consist of One precision specimen tube 2 inches bore x 4 inches long two pedestal cups and one metal stripping post for removing the rammed specimen from the tube Additional accessories are available for attaching to the rammer for the preparation of tensile and transverse test specimens INSTALLATION The rammer should be mounted on the ramming block and secured with the two bolts provided This is necessary in order to eliminate discrepancies in compaction of specimens which can occur when the rammer is mounted on some semi resilient surface such as a bench or table Alternatively the rammer may be secured to a solid brick or concrete base Screw the tube conditioner into the tapped hole in the rear left hand side of the base of the rammer frame and lock in place with the nut provided WARNING DO NOT TURN THE CAM HANDLE AND ALLOW THE WEIGHT TO FALL UNLESS A SAMPLE IS BEING RAMMED OTHERWISE SERIOUS DAMAGE TO THE RAMMER FRAME MAY RESULT TEST PROCEDURE a Spray the tube conditioner swab with liquid release agent This should be done as necessary to maintain the swab in a slightly moistened condition b Slide the specimen tube down over the conditioner and back again then place one cup over the end of the tube and set up vertically with the cup at the base c Weigh out sufficient sand to form a test piece 2 inches Igo inches when rammed using scales sensitive to 0 5 g Transfer to the specimen tu
127. ws The tensile tolerance is marked by a 1 32 inch wide groove in the rammer shaft marked T when the thickness of the rammed specimen is exactly 1 inch the centre of the groove will be in line with the top face of the rammer frame top lug Remove the core box assembly from the rammer loosen the knurled screw and separate the core box and test piece from the base Place the core box on a flat drying plate rap lightly and remove the two halves taking care not to deform the test piece Dry or cure specimen and cool before testing The use of a Mould Release Agent will assist in the clean stripping of test pieces 48 RIDSDALE DIETERT TRANSVERSE RAMMING ACCESSORY AFS GENERAL PRINCIPLES The Transverse Ramming Accessory is required to prepare AFS standard transverse specimens on the AFS Laboratory Sand Rammer DESCRIPTION This accessory consists of A split metal core box a sand hopper a base plate four drying plates a spring steel cut off knife a strickling plate and a ramming head which clamps on to the 2 inch diameter ram head INSTALLATION Clamp the ramming head onto the rammer shaft in the position shown in the illustration using the bolts and collar supplied Tighten the securing bolts evenly and just sufficiently to grip the ram end without distorting the collar TEST PROCEDURE a Assemble the core box and hopper on the base plate with both markers on the same end and insert a drying plate in the botto
128. ydrometer and ensure that it is clean and dry Gently stir the sample for five minutes Care should be taken to ensure that no air is introduced into the sample Stop the stirring unit and allow the sample to come to rest no detectable motion Place the hydrometer into the sample Care should be taken to position the hydrometer at least half an inch from the edge of the container or the mixer blade When placing the hydrometer in the liquid ensure that it does not drop too far The hydrometer should be allowed to slide gently from the hand so that it settles slowly into the liquid after being released If the hydrometer is observed to rise after its initial release it has not been properly placed in the sample and the test must be repeated starting at step a After the hydrometer is placed in the sample it should be allowed to settle for one minute At this time the value can be read directly from the hydrometer scale After the value has been taken measure the temperature of the sample and record 131 RIDSDALE DIETERT FOUNDRY HYDROMETER 0 90 Baum cont d IV CALIBRATION The Baum Hydrometer has a zero line on the scale and this can be checked using fresh water at the temperature specified by the manufacturer a Place the Foundry Hydrometer in a glass container with the inside diameter of at least three times that of the outside diameter of the hydrometer b Allow the gauge to equilibrate without touching the bott

foundry sand testing equipment operating instructions (afs) ridsdale

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