Southbend SB1231 User's Manual
Contents
1. MODEL SB1231 12 4 JAW INDEPENDENT CHUCK Instruction Sheet PHONE 360 734 1540 www southbendlathe com Hardened steel jaws Independent jaw WA R N I N G for durability and screws for each extreme clamping l reversible jaw Chucks are heavy Get assistance when installing or removing the chuck from the lathe Wear heavy duty leather boots for foot and toe protection and keep hands and fingers away from all pinch points Ignoring this warning can lead to a severe crushing injury or finger amputation force and grip spindle mounting Jaw screw retaining pin Manufactured with lock screws with high tech German CNC machinery Specifications e OD Clamping 0 69 10 04 17 5 255mm al yi e ID Clamping 3 74 10 83 95 275mm i ike Fine grain cast e Chuck Bore Diameter 2 56 65mm cs E iron body e Chuck Outer Diameter 11 81 300mm Maximum Speed cceceeeeeeeeeeeeees 2500 RPM Figure 1 Features e Mounting Type ccccceeceees D1 8 Camlock Construction 066 Fine Grain Cast Iron Chuck Weight 30 Ibs Introduction e Chuck Shipping Weight 006 85 lbs The Model SB1231 uses a direct mount D1 8 Country of Origin ceccceccceeeeeeeees Taiwan camlock system where the camlock studs are directly threaded into to the chuck body instead The maximum speed listed above is ONLY of being threaded i2. depth or feed rate Remove jaws clean de burr and re install verify accuracy and recalibrate test dial indicator Remove chuck clean and de burr mounting adjust camlock studs and re install chuck 1006 007 If you need help with your new chuck contact us at PHONE 860 734 1540 FAX 360 676 1075 International FAX 360 734 1639 USA Only EMAIL sales southbendlathe com 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 8 South Bend Lathe Co
3. rotate the chuck key clockwise to engage the jaw screw with the jaw then fully thread the jaw into the chuck a Place a set of wooden blocks under the chuck so the camlock studs do not rest on the table and clamp the chuck to the table aR phown ia Miputra 10 9 Align and re install the chuck South Bend Lathe Co T Model SB1231 INSTRUCTIONS Mfg Since 5 10 Troubleshooting Symptom The chuck has hard spots or binds completely The workpiece slips in the jaws Clamping accuracy is poor Parts List Possible Cause Jaw is in a poor position for clamping Lack of lubrication rust burr or metal shavings inside of chuck Broken tooth on the jaw or the jaw screw Incorrect jaw or workpiece clamping position Chuck is binding before full clamping force is achieved or a jaw or jaw screw is binding Cutting overload Workpiece improperly clamped or workpiece is misaligned Chuck loose mounting is off center or is improperly seated DESCRIPTION REVERSIBLE CHUCK JAW Possible Solution Re install jaws for maximum engagement with jaw slot and jaw screw Disassemble de burr clean and lubricate chuck Disassemble chuck and repair replace broken part Re install jaws for maximum engagement with jaw slot and jaw screw Chuck is loaded up with contaminants Disassemble and service chuck Loosen and retighten the chuck key several times to distribute lubricant Reduce cutting
4. be bored into workpiece Figure 8 Tightening sequence 7 After the workpiece is held in place by the jaws turn the chuck by hand and pay attention to the workpiece alignment If the workpiece is not correctly aligned for your operation turn the chuck and make fine adjustments by slightly loosening one jaw and tightening the opposing jaw until the workpiece is correctly aligned see Figure 9 for an example Figure 9 Non concentric workpiece correctly clamped in the 4 jaw chuck 6 South Bend Lathe Co Mfg Since 5 10 Model SB1231 Care amp Maintenance AWARNING Always disconnect machine from power before performing maintenance or serious personal injury may result For optimum performance from your chuck follow the maintenance schedule below Never hammer on the chuck jaws or a workpiece that is clamped in the chuck and never subject the C Set screw chuck to abrasives flame or water daw screw retaining pin l Figure 10 Chuck sequence of disassembly Daily e Check correct loose mounting bolts b Back the jaws out of the chuck e Keep the chuck clean and oiled e Use a vacuum rag or brush to clean the c Remove the four set screws chuck after use Never use air pressure to clean chips away from a chuck d Put on safety glasses and use a hammer e Avoid leaving the chuck clamped on a and drift punch to tap out each jaw screw workpiece unload th
5. e chuck jaws daily retaining pin e Make sure the chuck key is removed from the chuck when not in use e Slide the jaw screws out of their bores If the chuck ever becomes stiff to operate 4 Using mineral spirits clean and dry all it may have been contaminated with metal parts Inspect and fix all bores teeth pins chips or abrasives from incorrect or infrequent and mating surfaces for wear burrs galling maintenance intervals If this is the case the rust or cracks chuck must be disassembled cleaned and re lubricated 5 Without changing the dimension of any part use a wire brush emery cloth or dressing To disassemble the chuck for a full cleaning stones to remove all rust burrs or any high and lubrication service spots caused by galling i DISCONNECT LATHE ERGI PONEI 6 Coat all parts with any automotive NLGI 2 grease and carefully re assemble the chuck 2 ify that chuck ali k L a e ars are in the reverse order shown in Figure 10 present so the chuck can be re installed in the same position and remove the chuck Stamp the marks if they do not exist 7 Rotate the chuck key clockwise until the lead thread of each jaw screw is seen just entering the jaw guide then insert each 3 Leaving th lock studs in pl aaa a E tins S E Sent numbered jaw into its numbered slot disassemble the chuck in the sequence listed bel d sh in Fi 10 PRT E e TE 8 Oneata time hold each jaw against its jaw screw and
6. e to a stop on its own or use the brake if equipped Long Stock Safety Long stock can whip violently if not properly supported causing serious impact injury and damage to the lathe Reduce this risk by supporting any stock that extends from the chuck headstock more than three times its own diameter Always turn long stock at slow speeds South Bend Lathe Co Mfg Since 5 10 INSTRUCTIONS Model SB1231 Camlock Stud Installation The camlock studs that are shipped with this chuck may be pre installed from the factory If so skip this section and complete Chuck Installation and Removal on Page 4 otherwise install the camlock studs as outlined below 1 Oil and thread each cam stud into the chuck until the alignment groove is flush with the chuck surface as shown in Figure 2 2 Install and tighten the locking cap screw for each stud making sure that the camlock studs can slightly rotate back and forth Camlock Stud Adjustment If the camlock studs have been pre installed at the factory or if you are installing them for the first time slight machining differences between the lathe spindle and chuck can cause one or more camlocks to lock at the incorrect location If any cam line stops outside of a V mark when all of the camlocks have been tightened remove the chuck and adjust the height of the offending stud one full turn up or down as illustrated below After all camlocks operate correctly stamp alignment
7. ensure that the camlocks tighten and lock with the studs completely and will release without binding Ifa problem is found with the camlock locking or release remove the offending stud and clean it with mineral spirits Compare it with a good stud for any inconsistencies and replace it if a problem is found Inspect the bore cap screw seat depth and threads with others that are known to be correct Chase all threads and remove any burrs or dings in the seat Dry out the bore with compressed air and lightly re lubricate with a drop or two of machine oil or way oil NOTICE Do not install the chuck without having the camlock cap screws in place or fully tightened Otherwise the camlock studs may turn with the camlocks on release resulting in the chuck being permanently locked onto the spindle 6 With the help of another person or with the help of a chuck cradle align the chuck with the spindle so the studs and camlock bores are aligned correctly and carefully slide the chuck onto the lathe spindle Never rest the chuck on its lower studs as shown in Figure 5 and roll or push the top of the chuck into place on the spindle This is a bad practice that may damage the studs and camlock bores CORRECT INCORRECT bores AWARNING Before turning the lathe ON make sure the chuck key is removed A thrown chuck key can cause serious injury or dea
8. k does not immediately come off rotate the chuck approximately 60 and tap again Make sure all the marks on the cams and spindle are in proper alignment for removal Operation Non cylindrical parts can be held and brought into the spindle centerline for facing or boring The other benefit is that the majority of workpieces can be positioned out of the spindle rotation axis if a bore see Figure 9 or a step needs to be cut into a workpiece on an outlying edge For the best grip possible on odd shaped workpieces one or more jaws can also be rotated 180 to grab more surface area for clamping If all four jaws cannot be used to hold the workpiece you must use faceplate to reduce the risk of a workpiece being thrown To clamp a workpiece in the chuck 1 DISCONNECT LATHE FROM POWER 2 Install a center in the tailstock 3 Retract each jaw and place the workpiece flat against the chuck face 4 Slide the tailstock forward so the tip of the dead center applies enough pressure against the workpiece to hold it in place and then lock the tailstock in position 5 Move each jaw until it makes light contact with the workpiece 6 Following the sequence shown in Figure 8 tighten each jaw in small increments to move the workpiece into the required position Check frequently to make sure the intended center point of the workpiece has not wandered away from the spindle centerline while the jaws are being tightened Hole to
9. marks in the chuck and spindle to ensure that the chuck can be re installed in the same position after being removed Initial Adjustment Camlock Stud Alignment Groove is Flush with Chuck Surface Camlock Stud Must Slightly Rotate Back Forth Cap Screw Installed amp Tight Figure 2 Camlock stud installation Spindle Line CORRECT The Camlock Mark Stops Between the Alignment Marks INCORRECT The Camlock Mark Stops After the V Marks INCORRECT The Camlock Mark Stops Before the V Marks To Correct Turn Stud K Turn Out To Correct Turn Stud One Turn In Figure 3 Camlock stud adjustment South Bend Lathe Co 3 Model SB1231 Mfg Since 5 10 Chuck Installation and Removal 1 DISCONNECT LATHE FROM POWER 2 Lay a chuck cradle see Figure 4 or plywood under the chuck and over the bedway to protect the precision ground surfaces from damage and reduce the risk of fingers getting pinched Figure 4 Wooden chuck support cradle 3 Clean away debris and oily substances from the mating surfaces of the spindle and the chuck to ensure the best fit possible 4 Inspect and make sure that all camlock studs are undamaged clean and lightly oiled 5 Make sure that the camlock stud retaining cap screws are snug but still allow the studs to be rotated back and forth slightly by hand This free play is critical to
10. nto a backing plate that possible with the chuck jaws and the is bolted to the chuck Without using a back workpiece in complete rotational symmetry plate to mount the chuck the chuck jaws are The workpiece weight must be within the positioned closer to the headstock which gives limits of the lathe and the workpiece mass a longer distance between the jaws and the must be of equal density throughout to tailstock Another benefit is that the distance prevent centrifugal imbalance or radial between the jaws and the outboard spindle nose runout even if a tailstock or other support is reduced so if a spider support is used on the is used for additional support outboard spindle short gun barrels and other shorter workpieces can be held at both ends Copyright October 2010 by South Bend Lathe Co WARNING No portion of this manual may be reproduced without written approval CR13310 Printed in Taiwan Model SB1231 INSTRUCTIONS Mfg Since 5 10 Safety Chuck Key Safety A chuck key left in the chuck can become a dangerous projectile when the spindle 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 away from the machine Disconnect Power Disconnect the lathe from power before installing and removing the chuck or doing any maintenance or adjustments Accidental lathe startup can cause severe injury or death Secure Clamping A thrown wo
11. rkpiece may cause severe injury or even death When swapping the chuck jaw positions keep in mind that maximum gripping force is attained at full jaw and jaw screw engagement If only one is partially engaged overall clamping force is reduced Speed Rates Operating the lathe where maximum chuck speed is exceeded or at too high of a speed for an unbalanced workpiece can cause the workpiece to be thrown from the chuck Always use the appropriate feed and speed rates A thrown workpiece may cause severe injury or even death Large Chucks Large chucks are very heavy and difficult to grasp which can lead to crushed fingers or hands if mishandled Get assistance when installing or removing large chucks to reduce this risk Protect your hands and the precision ground ways by using a chuck cradle or piece of plywood over the ways of the lathe when servicing chucks Safe Clearances Often chuck jaws will protrude past the diameter of the chuck and can contact a coolant nozzle tooling tool post or saddle Before starting the spindle make sure the workpiece and chuck jaws have adequate clearance by rotating then by hand through its entire range of motion by hand Stopping Lathe By Hand Stopping the spindle by putting your hand on the workpiece or chuck creates an extreme risk of entanglement impact crushing friction or cutting hazards Never attempt to slow or stop the lathe chuck by using your hand Allow the spindle to com
12. stud releases Cam line is between the V marks If the cam is fully tightened but the cam line is positioned outside of the V marks remove the chuck and adjust the height of the offending camlock stud as outlined in Camlock Stud Adjustment on Page 3 Note Camlocks can become very tight A cheater pipe may be used to add leverage when loosening 8 When installation is complete and you are Cam line s satisfied with the results lightly stamp a set aligned with the of alignment marks on the chuck and spindle spindle mark Note Alignment marks ensure that the chuck can be re installed in the correct position every time for consistent chuck and spindle alignment It also allows for the same camlocks and studs to operate together for consistent locking and unlocking Figure 7 Camlock is fully loosened when the camlock line is aligned with the spindle mark South Bend Lathe Co 5 Model SB1231 Mfg Since 5 10 CAUTION During the next step the chuck may come off suddenly so it is important that you are ready to support its weight with a chuck cradle to prevent crushing your fingers or dropping the chuck 4 Using a dead blow hammer or other soft mallet lightly tap around the outer circumference of the chuck body to break the chuck free from the camlocks and the spindle nose taper 5 Use a rocking motion to carefully remove the chuck from the spindle If the chuc
13. th to the operator or bystanders 4 South Bend Lathe Co Mfg Since 5 10 Model SB1231 7 Tighten camlocks in a star pattern to draw To remove the chuck the chuck in evenly and reduce the chance 1 DISCONNECT LATHE FROM POWER of misalignment Make sure to tighten camlocks in an incremental manner to 2 ensure that one camlock does not get fully tightened before the others i e snug the camlocks on the first pass then moderately tighten on the next pass then fully tighten on the third pass Lay a chuck cradle or plywood under the chuck and over the bedway to protect the precision ground surfaces from damage and reduce the risk of fingers getting pinched AWARNING As you tighten the camlocks the chuck will seat with the spindle nose When fully tightened the cam line will fall between the two V marks on the spindle nose as shown in Figure 6 PINCH HAZARD Protect your hands and the precision ground bedways with plywood or a chuck cradle when removing the lathe chuck The heavy weight of a falling chuck can cause serious injury 3 Loosen the camlocks by turning the key counterclockwise approximately one third of a turn until the mark on the camlock aligns with the spindle mark on the spindle nose Figure 6 Camlock is fully tightened with the camlock see Figure 7 If the stud does not freely line positioned between the V marks release from the camlock wiggle the camlock until it
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