Southbend SB1224 User's Manual
Contents
1. Cam line aligned with spindle mark Figure 8 Camlock is fully loosened when the cam line is aligned with the spindle mark 4 Using a dead blow hammer or other soft mallet lightly tap around the outer circumference of the chuck body to loosen it from the spindle 5 Remove the chuck from the spindle using a light rocking motion to carefully slide the studs out of the bores If the chuck does not immediately come off rotate it approximately 60 and tap it again Make sure all the marks on the cams and spindle are in proper alignment for removal South Bend Lathe Co 5 Model SB1224 INSTRUCTIONS Mfg Since 1 11 Scroll Chuck Clamping Chuck Jaw Reversal This scroll type chuck has an internal scroll gear This chuck has 2 piece jaws that consist of a that moves all jaws in unison when adjusted with top jaw and a master jaw The top jaw can be the chuck key This chuck will hold cylindrical removed rotated 180 and re installed in the parts on center with the axis of spindle rotation reverse position for additional work holding and can be rotated at high speeds if the options When reversing the top jaws always workpiece is properly clamped and balanced keep them matched with their original master jaw to ensure the best fit Never mix jaw types or positions to accommodate an odd shaped workpiece To reverse 2 piece jaws Die a Tapi eia gi paame rand 1 DISCONNECT MACHINE FROM POWER may throw t2. MODEL SB1224 12 3 JAW SCROLL CHUCK Instruction Sheet PHONE 360 734 1540 www southbendlathe com Introduction This chuck uses a direct mount camlock system to attach to the spindle Direct mount chucks provide a number of advantages over chucks that require a back plate for mounting The main benefit is a larger maximum working area between the chuck jaws and tailstock The increased space is created by the absence of a back plate between the chuck and spindle Another benefit is that direct mount chucks require less initial setup time because the machinist is not required to machine a back plate to fit the chuck Reversible Top Jaws Two Piece Jaws Two Piece Center Split Chuck Rear Chuck Cap Screws Threaded Pinion Retaining Pins Figure 1 Main features of this chuck AWARNING Incorrect use of this tool can result in death or serious injury For your own safety read and understand this entire document before using Specifications Mounting Type Direct Mount D1 8 Camlock Chuck Outer Diameter 000 12 2 310mm Chuck Bore Diameter 0008 4 05 103mm OD Clamping Range 0 12 4 65 15 300mm ID Clamping Range 1 78 4 61 90 290mm Static Clamping Force cccecceeeeeeeeee 9890 lbs Maximum Chuck Key Torque 137 ft lbs x Maximum Speed ccccccccccecccescceeeeeeees 1800 RPM Chuc
3. take all safety precautions and double check the workpiece for proper clamping and support before starting the lathe Chuck Capacity Avoid exceeding the capacity of the chuck by clamping an oversized workpiece If the workpiece is too large to safely clamp with the chuck use a faceplate or a larger chuck if possible Otherwise the workpiece could be thrown from the lathe during operation resulting in serious impact injury or death Clamping Force Inadequate clamping force can lead to the workpiece being thrown from the chuck and striking the operator or bystanders Maximum clamping force is achieved when the chuck is properly maintained and lubricated all jaws are fully engaged with the workpiece and the maximum chuck clamping diameter is not exceeded Entanglement Entanglement with a rotating chuck can lead to death amputation broken bones or other serious injury Never attempt to slow or stop the lathe chuck by hand and always roll up long sleeves tie back long hair and remove any jewelry or loose apparel BEFORE operating Long Stock Long stock can suddenly whip violently when the lathe is started or without warning during lathe operations causing death or serious impact injury Always use additional support with any workpiece that extends from the chuck or the end of the outboard spindle more than three times the workpiece diameter 2 South Bend Lathe Co Mfg Since 1 11 INSTRUCTIONS Model SB1224 Ca
4. Brush all internal chuck components with a generous coat of chuck grease but do not pack the chuck full of grease Re assemble components in the reverse order of disassembly Make sure to follow the Chuck Jaw Installation instructions to ensure that the jaws are installed correctly Make sure you only use approved chuck lubricants Some lubricants can stain your chuck or have unintended reactions with cutting fluid which will destroy their ability to properly lubricate the chuck To avoid stripping threads or cracking a casting never use fasteners to draw components together and avoid using impact tools Instead be patient and properly seat the mating parts then use hand tools and a recently calibrated torque wrench to tighten fasteners EI South Bend Lathe Co Mfg Since 1 11 INSTRUCTIONS Model SB1224 2 Insert jaw 1 into jaw guide 1 and hold the Ch u ck Jaw nstal lation l jaw against the scroll gear When installing the jaws on a scroll chuck it is important to make sure they are installed correctly Incorrect installation will result in jaws that do not converge evenly and are unable to securely clamp a workpiece 3 Rotate the chuck key clockwise one turn to engage the tip of the scroll gear lead thread into the jaw Pull the jaw it should be locked into the jaw guide 4 Install the remaining jaws in numerical To install chuck jaws order in the same manner 1 Rotate the chuck key clockwise unti
5. 4 f j SB1214 South Bend Shop Clocks SB1298 SBL Bench Lathe Shop Clock SB1299 SBL Toolroom Lathe Shop Clock SB1300 SBL Lathe with Man These fine traditional shop clocks are constructed with a metal antique finished frame They are easy to read from a distance and measure 14 in diameter Pictures just don t do them justice They are very nice quality clocks and perfect for the South Bend Lathe aficionado South Bend Lathe Co
6. c0068 1 Qil 2dcostesdsiveisisseesss South Bend Way Oil SB1365 Chuck Grease cccccccceeeeeeeeees Bison 7 799 025 or Equiv Moly Disulphide Chuck Grease South Bend Lathe Co 7 Model SB1224 INSTRUCTIONS Mfg Since 1 11 Disassembly 1 Verify that registration marks have been made on the chuck and spindle Refer to Registration Marks section for details 2 Inspect the jaws and their slots to make sure they have matching numbers or marks If none are found stamp or scribe your own before continuing During re assembly jaws must be installed in the same slots 3 Use the chuck key to back out and remove the chuck jaws 4 Unthread all chuck fasteners and separate the chuck halves then remove the remaining chuck components to completely disassemble the chuck see below Pinion an Retaining Pin Rear Chuck Body and Fasteners Scroll Gear Note Some Features amp Fasteners are Excluded for Clarity Figure 11 Chuck components Cleaning When cleaning chuck components make sure to remove all grease sludge and metal particles using a brush and clear type mineral spirits or standard paint thinner Avoid using white colored mineral spirits acetone brake parts cleaner gasoline or acids If an incorrect solvent is used stains additives acids or contaminants can be left behind as a corrosive coating After cleaning and drying parts be sure to wipe down parts wit
7. cracked Workpiece is too long for jaw clamping only Workpiece is improperly clamped or is misaligned Jaws are positioned in the wrong jaw guides Top jaws are loose or improperly seated in their master jaws Chuck is loose mounting is off center or improperly seated Lathe spindle tailstock or cross slide is misaligned with lathe bed Lathe bed is twisted Workpiece requires additional support in addition to chuck jaws Incorrect jaw or workpiece clamping position Two piece jaw is loose top jaw improperly seated in master jaw Insufficient pinion and scroll gear torque Jaws or jaw screws bind before full clamping force is achieved Cutting overload Jaw teeth worn 2 piece jaw is loose Possible Solution Re install jaws in correct order and position Disassemble de burr clean and re lubricate chuck with chuck grease Replace damaged parts or replace chuck Remove chuck then clean and dress all mating surfaces of spindle amp chuck Install smaller lathe chuck so spindle and bearings will not become overloaded and vibrate Check and adjust lathe spindle end play and bearing preload Remove chuck and inspect adjust replace camlock studs for wear or damage as required Re install chuck with registration marks aligned Check and adjust lathe spindle end play and bearing preload Adjust as required Isolate component at fault by installing a different chuck If problem persists la
8. ection Plate for Chucks Installed by Hand Plywood amp 2x4 Chuck Cradle Plywood Chuck Cra Straight Cuts Pre Threaded Hole for Lifting Eye Ss Fabricated Steel Lifting Hook Figure 3 Examples of common devices used during chuck installation and removal South Bend Lathe Co 3 Model SB1224 INSTRUCTIONS Mfg Since 1 11 Chuck Installation To ensure accurate work it is extremely important to make sure the spindle nose and chuck mating surfaces tapers are clean Even a small amount of lint or debris can affect accuracy The chuck is properly installed when all camlocks are tight the spindle and chuck tapers firmly lock together and the back of chuck is firmly seated against the face of the spindle all the way around without any gaps To install the chuck 1 DISCONNECT LATHE FROM POWER 2 Use an appropriate lifting support or protective device to protect the ways and support the chuck 3 Clean and lightly oil the camlock studs then thoroughly clean the mating surfaces of the spindle and chuck 4 Install the chuck by inserting the camlock studs straight into the spindle cam holes Important Avoid inserting the studs by pivoting them in from an angle or rotating the spindle This can damage studs or bores CORRECT INCORRECT Figure 4 Inserting camlock studs into spindle bores 5 Incrementally tighten the camloc
9. h an oiled rag to prevent rust Light rust can be removed in a blast cabinet with soda blasting media For heavy rust have the chuck components hot tanked at a local automotive machine shop remove all non ferrous items first or they may dissolve Inspection amp Dressing Inspect all components carefully for burrs wear scoring bent parts cracks and thread damage Carefully inspect the chuck jaw clamping surface for tapered wear from front to back For minor wear jaw regrinding may be more economical than jaw replacement If the taper is heavy or grip or work holding accuracy is a problem chuck replacement is likely required Burrs dings flakes high spots or galled surfaces can usually be removed by lightly dressing them away with diamond lapping boards or honing stones with lapping oil Be sure not to change part dimensions while dressing surfaces Thread damage can usually be corrected with files and thread chasing tools If any parts are overly worn bent cracked or otherwise damaged they must be replaced if available Never attempt to repair chuck components by welding them If damaged parts are unavailable replace the chuck Continuing to use a chuck with damaged components will increase the risk of accidental death or serious injury Do not risk it If replacing fasteners make sure to use the same hardness or grade as the original fasteners that were installed on the chuck Reassembly
10. he workpiece Instead use an i j huck f late dependent Jas CHUUK r afaceplate 2 Remove the cap screws that secure the top jaw to the master bottom jaw Safer Inside Insufficient Jaw Use Jaw Clamping 3 Remove the top jaw rotate it 180 then re install it with the longest cap screw in the Bar Stock tallest portion of the jaw Unstable 4 Repeat Steps 2 3 with each remaining jaw Workpiece we recommend only reversing one jaw at a time to keep all original parts together Unsafe Jaw Fosition and Safer Outside Poor Scroll Gear Engagement Jaw Use nae Shallow TLD Grip Bar Stock Unstable Workpiece i Rotate Top Jaw 180 Safer Outside Unsafe Inside Jaw Use Jaw Use Shallow Bar Stock Unsafe Jaw Fosition and 7 Foor Scroll Gear Engagement Safer Inside Unsafe Jaw Fosition Jaw Use N AWARNING Remove all tools before turning lathe ON Thrown tools can cause serious injury or death to operator or bystanders Cylinder Poor Scroll Gear Engagement 7 Figure 9 Jaw selection and workpiece holding rs South Bend Lathe Co Mfg Since 1 11 INSTRUCTIONS Model SB1224 Maintenance A chuck can only achieve its maximum clamping force when its internal components are clean and well lubricated During operation centrifugal force displaces and thins the lubricant inside the chuck forcing it out over time If the chuck is exposed to cutting fluid this proces
11. ice Proper chuck service requires full disassembly cleaning and lubrication Perform this service every six months or more frequently if the chuck is exposed to dirty work environments heavy workloads or cutting fluid To avoid damage when servicing the chuck e Only clamp chuck parts in a vise equipped with soft jaws or wood aluminum blocks e Never use an open flame on chuck parts e Never strike the chuck with a steel hammer Instead use a brass hammer or soft mallet e Never apply force to stuck components if you are unsure about how they are fastened together Refer to the instructions e When separating or removing mated components do not attempt to pry or wedge them apart Instead patiently tap them at various locations with a brass hammer or mallet while rotating and pulling on them e Ifthe scroll gear or retainer is stuck soak parts in penetrating oil or solvent overnight if needed to break down grease suction then carefully rotate lift and tap it loose Items Needed Qty Hex Wrench Set Metric ccccccccccesceeeceeeeeeeeees 1 High Resolution Caliper 8 ccccccccceecceseeeeeees 1 Crocus Cloth amp Wire Brush 1 Ea Diamond Hone or Dressing Stones Various Files amp Thread Chasing Tools Various Mineral Spirits and Cotton Rags As Required Calibrated Torque Wrench ccccccceecceeeeeerees 1 Stiff 1 Brush for Applying Grease
12. k Jaw M12 Cap Screw Torque 78 8 ft lbs Rear Chuck M12 Cap Screw Torque 78 8 ft lbs Chuck Weight cccccccccccccccccceeeseeeeeeeeeeneees 105 lbs Country of Origin ccc ccccceceeeeeeeeeeeeeees Taiwan Even if a tailstock and steady rest are used the maximum speed rating may not be SAFELY reached with certain workpieces The workpiece must be balanced and appropriately sized for the chuck and lathe and the chuck must be properly maintained to achieve maximum clamping force As spindle speeds increase centrifugal force also increases If centrifugal force becomes too great the workpiece can be thrown from the chuck with deadly force Always use good judgment with each setup Copyright April 2011 by South Bend Lathe Co WARNING No portion of this manual may be reproduced without written approval CR13937 Printed in Taiwan Model SB1224 INSTRUCTIONS Mfg Since 1 11 Chuck Safety Trained Operators Only Using a chuck incorrectly can result in workpieces coming loose at high speeds and striking the operator or bystanders with deadly force To reduce the risk of this hazard read and understand this document and seek additional training from an experienced chuck user before using this chuck Using Correct Equipment Many workpieces can only be safely turned in a lathe if additional support equipment such as a tailstock or steady rest is used If the operation is too hazardous to be com
13. ks in a criss cross or star pattern to ensure that the chuck seats evenly against the spindle 6 When the chuck is fully seated and all the camlocks are tight verify that the cam line is between the two V marks on the spindle nose as shown in the following figure Camlock between V s Figure 5 Cam line positioned between the V marks after the camlocks are fully tightened If the cam line is NOT between the V marks when the camlock is tight the stud may be installed at the incorrect height To fix this adjust the stud height as shown in the following figure Make sure to re install the stud cap screw afterward If adjusting stud height does not correct the problem try swapping stud positions on the chuck ae z INCORRECT INCORRECT Stud Too High Stud Too Low Turn In Turn Out One Turn One Turn Figure 6 Correcting an improperly installed stud 4 South Bend Lathe Co Mfg Since 1 11 INSTRUCTIONS Model SB1224 7 Verify that the chuck fits the spindle properly by checking for any gaps between the mating surfaces If there are no gaps proceed to Step 9 If there is a gap remove the chuck re clean the mating surfaces carefully and re install If the problem persists refer to Troubleshooting 8 Verify that the chuck spindle tapers are seating firmly together by removing the chuck per the Chuck Removal instructions and paying c
14. l you see the tip of the scroll gear lead thread just begin to enter jaw guide 1 If installed correctly the jaws will converge evenly at the center of the chuck If the jaws do not converge evenly remove Lead Thread gt them Make sure the numbers of the jaws and jaw guides match then re install the jaws and make sure each one engages with the scroll gear lead thread during its first rotation Locations Figure 12 Installing jaw 1 South Bend Lathe Co 9 Model SB1224 INSTRUCTIONS Mfg Since 1 11 Troubleshooting Symptom The chuck key is hard to turn or it binds at some jaw locations Chuck mounts or seats incorrectly gap exists between chuck and spindle chuck vibrates during operation without a workpiece installed Workpiece has runout clamping accuracy or repeatability is poor turning results are poor The workpiece slips in the jaws 10 Possible Cause Jaws poorly positioned Lack of lubrication rust burrs metal chips or contaminants inside chuck Jaw guides scroll gear or pinion distorted worn or broken Chuck is loose or cocked on spindle gap between spindle chuck mating Chuck is too large for lathe Lathe spindle is loose Camlock studs are at fault Lathe spindle is loose Poor chuck spindle taper fit causes radial or axil runout from chuck shifting when camlocks are tightened Chuck is distorted or
15. lose attention to how easily the tapers release If it was necessary to bump the chuck or use a mallet to release the tapers then they are seating together properly If the tapers released easily with little intervention they are not seating together firmly as required Remove the chuck re clean the mating surfaces carefully and re install If the problem persists refer to Troubleshooting Registration Marks Lightly stamp registration marks across the mating seams of chuck components These marks will help you re install the chuck in the same position after removal which ensures consistent chuck balance and turning results and allows the same camlocks and studs to operate together for consistent locking and unlocking Spindle amp Chuck Registration Marks Chuck Halves Camlock Spindle for Chuck Reassembly Direct Mount Camlock Chuck Figure 7 Registration mark locations Chuck Removal To remove the chuck 1 DISCONNECT LATHE FROM POWER 2 Use an appropriate lifting support or protective device to protect the ways and support the chuck 3 Loosen the camlocks by turning the key counterclockwise until the cam lines are aligned with the mark on the spindle nose Tip Camlocks can become very tight A cheater pipe may be used as a last resort to add leverage when loosening After loosening you may need to wiggle the chuck key in the camlock to fully disengage the stud
16. mlock Stud Installation This section provides information about how to install and adjust the camlock studs so the chuck properly mounts to the spindle Note You can skip this section if the camlock studs are already installed To install the camlock studs 1 Lightly oil the threads of each stud 2 Thread the studs into the chuck until the datum line is flush with or just above the surface of the chuck and the alignment groove is positioned over the hole Datum Line Flush with Chuck Surface Alignment Groove Figure 2 Camlock stud installation 3 Install a cap screw in the hole next to each stud These cap screws prevent the studs from rotating so they properly engage with the camlock during installation Note It is normal for studs to have a small amount of play or looseness after installing and tightening the cap screws Chuck Installation amp Removal Devices AWARNING A dropped chuck can cause amputation serious crushing injuries or property damage Always use a lifting support or protective device to reduce this risk when installing or removing a chuck Because chucks are heavy and often awkward to hold some kind of lifting support or protective device should be used during installation or removal The weight and size of the chuck will determine the appropriate device to use refer to the following figure for examples SMALL LIGHTWEIGHT CHUCKS Plywood Prot
17. pleted with the lathe or existing equipment the operator must have enough experience to know when to use a different machine or find a safer way Disconnect Power Serious entanglement or impact injuries could occur if the lathe is started while you are adjusting servicing or installing the chuck Always disconnect the lathe from power before performing these procedures Handling Chucks Chucks are heavy and awkward to hold especially if they are oily A dropped chuck can result in amputation or crushing injuries and equipment damage Always use some kind of chuck cradle protective device or lifting assistance when installing and removing chucks Chuck Key Safety A chuck key left in the chuck can become a dangerous projectile when the lathe is started Always remove the chuck key after using it Develop a habit of not taking your hand off of a chuck key unless it is removed from the chuck Proper Maintenance All chucks must be properly maintained and lubricated to achieve maximum clamping force and withstand the rigors of centrifugal force To reduce the risk of a thrown workpiece follow all maintenance intervals and instructions in this document Speed Rates Fast spindle speeds increase the centrifugal force on the chuck and workpiece Excessive centrifugal force can cause the chuck to lose its grip and throw a workpiece or cause a chuck to break apart with deadly consequences Use slow spindle speeds when ever possible
18. s happens even faster If maintenance is not followed daily the chuck will lose its internal lubrication and collect cutting fluid sludge rust and metal chips which can cut the maximum chuck clamping force in half A chuck with reduced clamping force has a much higher risk of losing its grip during operation and throwing the workpiece with deadly force Daily Maintenance e Check correct loose mounting bolts e Use a vacuum rag or brush to clean the chuck after use e Wipe down the outside of the chuck with a light machine oil or way oil Regular Lubrication Recommended Lubricant Chuck Grease tsi cts2cscsatestenstoszsieas Bison 7 799 025 or Equiv Moly Disulphide Chuck Grease Oil orsin South Bend Way Oil SB1365 Lubricate the scroll thread and jaw slides regularly using either chuck grease or way oil To lubricate remove and clean the jaws clean chips off the scroll gear if necessary then re install the jaws and apply lubricant to the scroll gear and jaw sliding surfaces Move the jaws in and out to distribute the lubricant Chuck grease provides superior lubrication and clamping force its drawback is that chips easily stick to it and get drawn into the chuck leading to binding and reduced clamping force Way oil is a good alternative lubricant to reduce the amount of chips that stick to the chuck its drawback is a reduction of clamping force making it a poor choice for heavy clamping loads Chuck Serv
19. the spindle may be at fault If problem goes away chuck may be at fault Replace chuck Use tailstock rests and outboard spindle support use slower spindle speeds Remove jaws then clean de burr and re install Re install jaws in their correct guides Remove jaws clean jaw teeth and guides then re install jaws using the correct torque for fasteners Refer to troubleshooting for chuck mounting incorrectly Align lathe components Place shims under lathe to level bed ways Use tailstock rests and outboard spindle support Use slower spindle speed Re position jaws and workpiece for maximum scroll gear and jaw engagement Verify that workpiece is not too large or heavy for chuck Remove jaws clean mounting surfaces and re install with the correct cap screw torque Lubricate chuck and re tighten the chuck key Service the chuck as described in this document Reduce cutting depth or feed rate Have jaws reground replace jaws or replace chuck South Bend Lathe Co Mfg Since 1 11 Model SB1224 Parts Breakdown 15 REF PART DESCRIPTION REF PART DESCRIPTION PSB1224001 FRONT CHUCK BODY 9 PCAP171M CAMLOCK STUD 1 5 4 5 6 7 5 Please Note We included this parts breakdown for service purposes only Since many of the parts shown are machined to each individual chuck they may not be available as replacement items So
20. uth Bend Lathe Co 11 Other Great Items from South Bend Quick Change Tool Post Sets SB1405 Set 1 for 9 12 Swing Lathe SB1406 Set 2 for 10 110 Swing Lathe SB1407 Set 3 for 13 18 Swing Lathe SB1408 Set 4 for 14 20 Swing Lathe These are probably the smoothest and hardest locking tool posts on the market today Wedge locking design prevents tool holder from shifting during the heaviest of cuts The unique and ergonomic locking handle was designed by South Bend engineers to prevent fatigue during frequent tool changes Set Includes e Turning Tool Holder e Turing Boring Holder e Boring Bar Holder e Parting Blade Holder e Knurl Facing Holder e Tool Post w T nut Way Oil SB1365 Way Oil 12 oz Engineered for the high pressure exerted on horizontal or vertical ways and slides Protects against rust and corrosion Ensures stick free smooth motion which maximizes finishes and extends the life of your machine Won t gum up 12 oz AMGA 2 ISO 68 Equivalent WAY OIL FOR LATHES 381905 un 12 4 Jaw Independent Chucks SB1232 14 4 Jaw Independent Direct Mount D1 8 Chuck SB1214 12 4 Jaw Independent Plain Back Chuck SB1404 12 Backplate D1 8 for SB1214 South Bend chucks are made for high precision work with tight tolerances to satisfy the most demanding machinists out there Constructed of fine grain cast iron with a super finish SB1232
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