MODEL SB1223 10" 3-JAW SCROLL CHUCK Instruction Sheet PHONE: (360) 734-1540 • www.southbendlathe.com Introduction This chuck uses a direct-mount camlock system Incorrect use of this tool to attach to the spindle. Direct-mount chucks can result in death or provide a number of advantages over chucks that serious injury. For your require a back plate for mounting. own safety, read and understand this entire The main benefit is a larger maximum working document before using. area between the chuck jaws and tailstock. The increased space is created by the absence of a back plate between the chuck and spindle. Specifications Another benefit is that direct-mount chucks Mounting Type ......... Direct Mount D1-8 Camlock require less initial setup time because the Chuck Outer Diameter ......................10" (255mm) machinist is not required to machine a back plate Chuck Bore Diameter ............................3" (76mm) to fit the chuck. OD Clamping Range ........ 0.43"–9.8" (11­­­­–240mm) ID Clamping Range ......... 2.76"–9.1" (70–230mm) Reversible Top Jaws Two-Piece Jaws Static Clamping Force .............................. 8090 lbs Maximum Chuck Key Torque .................115 ft/lbs *Maximum Speed .................................. 1800 RPM Chuck Jaw M12 Cap Screw Torque .......78.8 ft/lbs Rear Chuck M10 Cap Screw Torque ......53.5 ft/lbs Two-Piece Chuck Weight ................................................ 68 lbs Center Country of Origin ....................................... Taiwan Split Chuck * Even if a tailstock and steady rest are used, the maximum speed rating may not be Camlock SAFELY reached with certain workpieces. Rear Direct Studs Chuck Cap Mount The workpiece must be balanced and Screws Back 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 Threaded also increases. If centrifugal force becomes Pinion too great, the workpiece can be thrown from Retaining the chuck with deadly force. Always use good Pins judgment with each setup! Figure 1. Main features of this chuck. Copyright © April, 2011 by South Bend Lathe Co. WARNING: No portion of this manual may be reproduced without written approval. #CR13936 Printed in Taiwan Model SB1223 INSTRUCTIONS Mfg. Since 1/11 Chuck Safety Trained Operators Only. Using a chuck Speed Rates. Fast spindle speeds increase the incorrectly can result in workpieces coming centrifugal force on the chuck and workpiece. loose at high speeds and striking the operator Excessive centrifugal force can cause the chuck or bystanders with deadly force. To reduce the to lose its grip and throw a workpiece, or cause a risk of this hazard, read and understand this chuck to break apart with deadly consequences. document and seek additional training from an Use slow spindle speeds when ever possible, experienced chuck user before using this chuck. take all safety precautions, and double check the workpiece for proper clamping and support Using Correct Equipment. Many workpieces can before starting the lathe. only be safely turned in a lathe if additional support equipment, such as a tailstock or steady Chuck Capacity. Avoid exceeding the capacity of rest, is used. If the operation is too hazardous the chuck by clamping an oversized workpiece. to be completed with the lathe or existing If the workpiece is too large to safely clamp equipment, the operator must have enough with the chuck, use a faceplate or a larger chuck experience to know when to use a different if possible. Otherwise, the workpiece could machine or find a safer way. be thrown from the lathe during operation, resulting in serious impact injury or death. Disconnect Power. Serious entanglement or impact injuries could occur if the lathe is started Clamping Force. Inadequate clamping force can while you are adjusting, servicing, or installing lead to the workpiece being thrown from the the chuck. Always disconnect the lathe from chuck and striking the operator or bystanders. power before performing these procedures. Maximum clamping force is achieved when the chuck is properly maintained and lubricated, all Handling Chucks. Chucks are heavy and jaws are fully engaged with the workpiece, and awkward to hold, especially if they are oily. the maximum chuck clamping diameter is not A dropped chuck can result in amputation exceeded. or crushing injuries and equipment damage. Always use some kind of chuck cradle, protective Entanglement. Entanglement with a rotating device, or lifting assistance when installing and chuck can lead to death, amputation, broken removing chucks. bones, or other serious injury. Never attempt to slow or stop the lathe chuck by hand, and always Chuck Key Safety. A chuck key left in the chuck roll up long sleeves, tie back long hair, and can become a dangerous projectile when the remove any jewelry or loose apparel BEFORE lathe is started. Always remove the chuck key operating. after using it. Develop a habit of not taking your hand off of a chuck key unless it is removed from Long Stock. Long stock can suddenly whip the chuck. violently when the lathe is started, or without warning during lathe operations causing death Proper Maintenance. All chucks must be properly or serious impact injury. Always use additional maintained and lubricated to achieve maximum support with any workpiece that extends from clamping force and withstand the rigors of the chuck or the end of the outboard spindle centrifugal force. To reduce the risk of a thrown more than three times the workpiece diameter. workpiece, follow all maintenance intervals and instructions in this document. -2- Mfg. Since 1/11 INSTRUCTIONS Model SB1223 Camlock Stud Chuck Installation & Installation Removal Devices This section provides information about how to install and adjust the camlock studs so the chuck properly mounts to the spindle. A dropped chuck can cause amputation, Note: You can skip this section if the camlock serious crushing injuries, or property damage. studs are already installed. Always use a lifting, support, or protective device to reduce this risk when installing or removing a chuck. To install the camlock studs: 1. Lightly oil the threads of each stud. Because chucks are heavy and often awkward to hold, some kind of lifting, support, or protective 2. Thread the studs into the chuck until the device should be used during installation or datum line is flush with or just above the removal. The weight and size of the chuck will surface of the chuck, and the alignment determine the appropriate device to use (refer to groove is positioned over the hole. the following figure for examples). Alignment Datum Line SMALL, LIGHTWEIGHT CHUCKS Groove Flush with Chuck Surface Plywood Protection Cap Plate for Chucks Screw Installed by Hand MEDIUM-SIZE, HEAVY CHUCKS Plywood & 2x4 Solid Block Chuck Cradle Chuck Cradle Figure 2. Camlock stud installation. Way Slot 3. Install a cap screw in the hole next to each Jaw Slot stud. These cap screws prevent the studs Plywood Chuck Cradle Plywood Chuck Cradle from rotating so they properly engage with (Straight Cuts) (Curved Cuts) 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. LARGE, VERY HEAVY CHUCKS Pre-Threaded Hole Fabricated Steel for Lifting Eye Lifting Hook Figure 3. Examples of common devices used during chuck installation and removal. -3- Model SB1223 INSTRUCTIONS Mfg. Since 1/11 5. Incrementally tighten the camlocks in a Chuck Installation criss-cross or star pattern to ensure that the To ensure accurate work, it is extremely chuck seats evenly against the spindle. important to make sure the spindle nose and chuck mating surfaces/tapers are clean. Even 6. When the chuck is fully seated and all the a small amount of lint or debris can affect camlocks are tight, verify that the cam line accuracy. is between the two "V" marks on the spindle nose, as shown in the following figure. 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 Camlock between “V”s protective device to protect the ways and support the chuck. Figure 5. Cam line positioned between the "V" marks after the camlocks are fully tightened. 3. Clean and lightly oil the camlock studs, then thoroughly clean the mating surfaces of the — If the cam line is NOT between the "V" spindle and chuck. marks when the camlock is tight, the stud may be installed at the incorrect height. 4. Install the chuck by inserting the camlock To fix this, adjust the stud height as studs straight into the spindle cam holes. shown in the following figure. Make sure to re-install the stud cap screw afterward. Important: Avoid inserting the studs by pivoting them in from an angle or rotating — If adjusting stud height does not correct the spindle. This can damage studs or bores. the problem, try swapping stud positions on the chuck. CORRECT INCORRECT INCORRECT INCORRECT Stud Too High: Stud Too Low: Turn In Turn Out One-Turn One-Turn Figure 4. Inserting camlock studs into spindle bores. Figure 6. Correcting an improperly installed stud. -4- Mfg. Since 1/11 INSTRUCTIONS Model SB1223 7. Verify that the chuck fits the spindle properly by checking for any gaps between Chuck Removal the mating surfaces. To remove the chuck: — If there are no gaps, proceed to Step 9. 1. DISCONNECT LATHE FROM POWER! — If there is a gap, remove the chuck, re- 2. Use an appropriate lifting, support, or clean the mating surfaces carefully, and protective device to protect the ways and re-install.