Southbend SB1001 - Manual (Page 30)

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For Machines Mfg. Since 8/11 Model SB1001 8K ™ Lathe O P E R A T I O N
Because of the dynamic forces involved in
machining a non-concentric or off-center
workpiece, always use a low spindle speed
to reduce risk of the workpiece coming loose
and being thrown from the lathe, which could
cause serious personal injury.
4-Jaw Chuck
Refer to the Chuck Installation (see Page 25)
and Chuck Removal (see Page 27) instructions
to install or remove a 4-jaw chuck.
The optional Model SB1468 4-jaw chuck features
independently adjustable jaws for holding non-
concentric or off-center workpieces. Each jaw can
be independently removed from the chuck body
and reversed for a wide range of work holding
versatility.
Mounting Workpiece
1. DISCONNECT LATHE FROM POWER!
2. Place a sturdy piece of plywood under the
spindle to protect the bed ways during the
installation process.
3. Use the chuck key to open each jaw so the
workpiece will lay flat against the chuck
face, jaw steps, or into the spindle opening.
4. Position the workpiece so it is centered in
the chuck.
Figure 23. 4-jaw tightening sequence.
1
2
3
4
Workpiece
Centerpoint
5. Tighten each jaw in small increments.
After you have adjusted the first jaw,
continue tightening the remaining jaws
in an opposing sequence, as shown by the
sequential order in Figure 23.
6. After the workpiece is held in place by the
jaws, use a dial indicator to make sure the
workpiece is centered in the chuck.
— If the workpiece is not correctly centered,
make fine adjustments by slightly
loosening one jaw and tightening the
opposing jaw until the workpiece is
correctly positioned (see Figure 24 for an
example).
Figure 24. Example photo of non-cylindrical workpiece
correctly mounted on the 4-jaw chuck.