OPERATOR`S MANUAL SUPPORTED TORQUE CALIBRATION BEAM
Contents
1. ORE THAN 1 PERSON 2 1 Line up the bearing support with holes in the middle of the bed Beam y Bearing Support FIGURE 3 Location of Beam amp Bearing Support 2 2 Position of beam is established by fitting bearing support with 2 off M8 shoulder bolts supplied Tighten to 10 N m 2 3 Fix using 6 off M12 bolts supplied Tighten to 80 N m 2 4 Fit 2 off guide plates to bed Tighten 4 off M8 bolts to 10 N m 3 Levelling Gearbox 3 1 Remove M6 end stop screw from pedestal bed 3 2 Line up the levelling gearbox with the slots in the pedestal bed then slide on Ensure drive square input is facing beam as shown in figure 4 se Levelling Gearbox OSE 2 End Stop Screw FIGURE 4 Location of Levelling Gearbox 3 3 Fit M6 end stop screw to pedestal bed 4 Hangers TIP The hangers are supplied ready to attach to the beam Ensure the correct hanger is fixed to the correct end of the beam If the hanger assembly is taken apart DO NOT mix parts with the other hanger assembly 4 1 Bolt hanger marked XX to beam end marked XX Bolt hanger marked YY to beam end marked YY Choose a location A B C D E F G or H for each beam the required location is set in the Operating Instructions 4 2 Place weight platform under hanger to be loaded as shown in figure 5 FIGURE 5 Hanger Weight Platform OPERATING INSTRUCTIONS WARNING KEEP HANDS CLEAR OF MOVING PARTS DURING USE Transdu2. PORE 128383 Tel 65 6841 1371 Email singapore norbar com au NORBAR TORQUE TOOLS SHANGHAI LTD E Building 5F no 1618 Yishan Road Minhang District Shanghai CHINA 201103 Tel 86 21 6145 0368 Email sales norbar com cn nag NORBAR TORQUE TOOLS INDIA PVT LTD Plot No A 168 Khairne Industrial Area Thane Belapur Road Mahape Navi Mumbai 400 709 INDIA Tel 91 22 2778 8480 Email enquiry norbar in WWW norbar com
3. SUPPORTED TORQUE CALIBRATION BEAM Part Number 34320 Issue 4 Original Instructions English CONTENTS Part Numbers Covered by This Manual Safety Introduction Parts Included Accessories Features and Functions External Effects Temperature Compensation Gravitational Effects Buoyancy Effects Set up Instructions Fixing Pedestal Beam amp Bearing Support Levelling Gearbox Hangers Operating Instructions Locating Transducer Locating Hangers Exercising Calibration Maintenance Beam Repair amp Recalibration Weight Recalibration Specifications Trouble shooting Glossary of terms Oo NNN amp K BOW amp N NOOA mma 23o 11 11 12 12 12 PART NUMBERS COVERED BY THIS MANUAL 21842 500 5000 500 5000 SAFETY It is recommended that safety shoes are worn Use safe manual handling techniques when lifting INTRODUCTION This calibration beam is designed for the static calibration of torque transducers Torque is generated by the application of a known force weights at a known radius from the centre of rotation of the torque transducer Reaction is taken via a levelling gearbox so the beam can be kept horizontal Parts Included Hangers Weight Platform N Pedestal A FIGURE 1 Parts Included nG Quantity Quantity Beam with bearing support 1 Guide plate 2 Pedestal with bed 1 Hangers 2 Levelling gearbox 1 Weight platform 1 Jacking plate 2 Raw bolts 4 Torque
4. air Weight Recalibration It should be possible to obtain local recalibration of weight sets Please contact Norbar if further assistance is required 11 SPECIFICATIONS Absolute maximum torque 110 for each beam location Recommended temperature 20 C 2 C Humidity 30 to 70 Location hole accuracy 0 01 of nominal TROUBLE SHOOTING Problem Solution O OOOO Can not achieve zero torque Levelling gearbox causing small load remove levelling gearbox GLOSSARY OF TERMS rem Meaning Bearing Support Centre of beam rotation Class M1 Weight classification Hanger Device to hold weights Pedestal Main support for calibration beam Weight Platform Device to rest weights on between tests Levelling Gearbox Device to ensure beam is level PAA IS NORBAR TORQUE TOOLS LTD Beaumont Road Banbury Oxfordshire OX16 1XJ UNITED KINGDOM Tel 44 0 1295 270333 Email enquiry norbar com 2 NORBAR TORQUE TOOLS PTY LTD 45 47 Raglan Avenue Edwardstown SA 5039 AUSTRALIA Tel 61 0 8 8292 9777 Email enquiry norbar com au NORBAR TORQUE TOOLS INC 36400 Biltmore Place Willoughby Ohio 44094 USA Tel 1 866 667 2279 Email inquiry norbar us NORBAR TORQUE TOOLS NZ LTD B3 269A Mt Smart Road Onehunga Auckland 1061 NEW ZEALAND Tel 64 9579 8653 Email nz norbar com au Norbar Torque Tools Ltd 2007 NORBAR TORQUE TOOLS PTE LTD 194 Pandan Loop 07 20 Pantech Business Hub SINGA
5. cer Levelling Gearbox 7 gt ps o o E a haet FIGURE 6 Location of Transducer TIP This is a general procedure to use the calibration beam Use this procedure along with any specific standard being followed Locating Transducer 1 Connect transducer to display unit required Zero reading on display 2 Mount the transducer between beam amp levelling gearbox using appropriate adaptors see figure 6 Slide the levelling gearbox so the transducer drive squares are fully engaged Allow the required warm up time for transducer amp display a minimum twenty 20 minutes is recommended Locating Hangers FIGURE 7 Beam Location Holes 1 The beam has many location holes for the hangers see figure 7 The required location depends on the torque required amp the weights used Use the following table to determine the hanger location Absolute Torque i eae maximum torque e J x Distance for overload test A 1 52400 4 448 22 1000 5000 Ibf ft 110 B 1 34885 4 448 22 1000 6000 N m 110 C 1 12404 4 448 22 1000 5000 N m 110 D 0 899236 4 448 22 1000 4000 N m 110 E 0 786832 4 448 22 1000 3500 N m 110 F 1 21920 4 4 448 22 1000 4000 Ibf ft 110 G 1 00000 i 110 H 0 91440 3 4 448 22 1000 3000 Ibf ft 110 For use with metric weights 2 Bolt the hangers to the required location Ensure that the correct hanger is located at each end of the beam 3 Place weight plat
6. ement can be taken Q Tm Mm O After the last increment remove all weights Remove levelling gearbox from transducer A final zero result can be measured Ea FIGURE 8 Beam Spirit Level NOTE If the transducer needs adjusting refer to appropriate operator s manual or service manual NOTE For reverse calibration the weights are applied to the opposite hangers The transducer will need to be exercised in the reverse direction before calibration 10 MAINTENANCE Beam Repair amp Recalibration Norbar Supported Calibration Beams are designed for transducer calibration at low levels of uncertainty They are robust for normal handling by technicians but if dropped or otherwise damaged may lose their calibration integrity It is therefore essential that the beam is recalibrated after any such incident Recalibration involves establishing the beam length from the centre of the driving square to a locus of points on the beam end See original calibration certificate for further details This is difficult to achieve with conventional length standards although use of a Co ordinate Measuring Machine may give satisfactory results Planned calibration intervals will depend on usage and should be decided by the laboratory Norbar offers a full repair and recalibration service with traceable certification of status before and after repair Due to the complex nature of the beams please contact Norbar in the event of any damage requiring rep
7. form figure 5 under hanger to be loaded NOTE The hangers must be loaded equally so weights are added in pairs Exercising 1 Itis recommended to exercise the transducer before calibration this can be done by loading to full scale then removing the weights three 3 times The display output should be watched during this process to avoid overloading The exercising procedure is A Apply torque by adding the required weights to the hangers then winding the handle on the levelling gearbox until full scale torque is displayed B Decrease torque by un winding the handle on the levelling gearbox until the display reads the minimum value and weights are firmly seated on weight platform C Repeat steps A amp B two more times Remove all weights E Ensure transducer display is set to zero before calibration The levelling gearbox may need to be removed from the transducer to get a true zero Calibration 1 The transducer is loaded in the required increments Gentle application of the weights is advised to maintain a steady reading At each torque increment the procedure is A Place weights onto hangers loading the twin hangers equally B Wind the handle on the levelling gearbox to lift the weights clear of the weight platform C Level beam using the levelling gearbox Ensure the beam spirit level reads correctly see figure 8 Waiting for the reading to stabilise Take torque reading from display The next torque incr
8. ording to the details below The Coefficient of linear expansion for steel is 12 x 10 C or 0 000012 per C The formula for calculating the change in effective beam length is Change in length Initial beam radius x Coefficient of linear expansion x Change in temperature in C from 20 C Nominal Example 1 metre radius beam used at 24 C Change in length Initial beam radius x 12 x 10 x 4 Change in length 1 x 12 x 10 x 4 Change in length 4 8 x 10 Change in length 0 000048 metre New effective beam radius Initial beam radius Change in length New effective beam radius 1 000048 metre Example 1 metre radius beam used at 16 C Change in length Initial beam radius x 12 x 10 x 4 Change in length 1 x 12 x 10 x 4 Change in length 4 8 x 10 Change in length 0 000048 metre New effective beam radius Initial beam radius Change in length New effective beam radius 0 999952 metre Gravitational Effects It is very important that the gravitational value for the Laboratory is established The effect of not doing this in the UK could be a variation in the force produced by the weight of up to approximately 0 05 which is five times the 0 01 tolerance of the weight Outside of the UK this variation in force could be significantly more It is therefore strongly recommended that you establish the local value of gravity g for your Laboratory and use weights that have been calibrated at
9. s 1 Fixing Pedestal 2 Beam amp Bearing Support 3 Levelling Gearbox 4 Hangers NOTE The set up instructions must be followed in the sequence shown Items required Spanner set Allen key set Spirit level recommended accuracy 0 5 mm m 4 x Suitable fixing bolts amp Drill to suit fixing bolts 1 Fixing Pedestal 1 1 Ensure the floor is flat clean and capable of supporting a weight of 480 Kg 1 2 Position pedestal to allow access around the calibration beam when assembled NOTE Fixing bolts NOT included Customer must supply 4 off M10 Fixing bolts to suit their concrete floor Pull out force on fixing bolts must exceed 2 5 KN Ensure the concrete floor is capable of taking 30 N mm7 Tighten fixing bolts to achieve a minimum of 6 KN tension in the bolts 1 3 Drill concrete floor to accept the fixing bolts Fit fixing bolts to hold pedestal to floor do not fully tighten yet 1 4 Locate jacking plates supplied under jacking screws as shown in figure 2 FIGURE 2 Pedestal Base with Fixing Holes amp Jacking Screws 1 5 Place a spirit level on the machined surface of the pedestal bed and adjust jacking screws to ensure pedestal is level For correct calibration it is essential the pedestal is level in all directions 1 6 Fully tighten the raw bolts to the required torque 1 7 Check pedestal bed is level 2 Beam amp Bearing Support WARNING THE BEAM amp BEARING SUPPORT IS HEAVY THIS TASK REQUIRES M
10. that gravitational constant Norbar will supply weights calibrated to gravitational constants specified by the customer However if the customer does not specify a value for g the value can be calibrated at an estimated gravitational constant for the customer s location This will be agreed with the customer prior to calibration Buoyancy Effects The Norbar system uses calibrated weights to generate a downwards force This means that Archimedes principle applies i e air pressure under the weights causes an upwards force This reduces the effective force generated by the weights and therefore the mass must be increased to allow for this Under standard conditions i e Air density 1 2 kg m and 20 C and working in conventional mass terms the increase required is by a factor of 0 015 Weights purchased from Norbar will already have this factor taken into account Weights that are calibrated to standard procedures do not have this factor taken into account because the air buoyancy affects both sides of the mass balance and can be ignored It is important that weights used for torque transducer calibration are adjusted for air buoyancy It should also be noted that the double ended beam design employed by Norbar means that each half of the beam is balanced with regard to buoyancy of the beam This is a significant advantage over single arm counterbalanced systems SET UP INSTRUCTIONS The set up of this beam covers the following item
11. wrench 1 Calibration certificate 1 M8 Bolt 25354 90 2 M12 Bolt 25356 35 6 Bearing support to pedestal Bearing support to pedestal M6 Bolt 25353 25 Guide plate to bed 4 Operator s Manual 1 Accessories Part Number 21469 NAM Set of 20 x 50 Ibf weights to give 5000 N m 5000 Ibf ft FEATURES AND FUNCTIONS Transducer Compatibility The calibration beam is ideally suited to Norbar torque transducers but may be used on other manufacturer s equipment Beam Alignment A self locking gearbox provides an easy method of keeping the beam horizontal once loaded Traceability The beams and weights are guaranteed within a tolerance of accuracy and traceable certification is provided Torque Accuracy The beam and its associate stand have been robustly constructed to ensure only torque is applied to the transducer under test Any torque losses through bending or bearing loss seen by the transducer have been minimised Weight accuracy is required to be equal to or better than 0 01 which approximates to class M1 Clockwise Counter Clockwise Operation The symmetrical beams allow for both clockwise and counter clockwise calibration EXTERNAL EFFECTS Temperature Compensation The calibration beam should be used in a temperature controlled environment of 20 C 2 C If the beam must be used outside these limits the temperature must be stable within 1 C change per hour and the effective length of the beam calculated acc
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