Scroll Chuck Clamping; 4-Jaw Chuck; Mounting Workpiece - South bend SB1050F Manual

For Machines Mfg. Since 5/11

Scroll Chuck Clamping

This scroll-type chuck has an internal scroll-gear
that moves all jaws in unison when adjusted with
the chuck key. This chuck will hold cylindrical
parts on-center with the axis of spindle rotation
and can be rotated at high speeds if the
workpiece is properly clamped and balanced.
Never mix jaw types or positions to
accommodate an odd-shaped workpiece.
The chuck will spin out of balance and
may throw the workpiece! Instead, use an
independent jaw chuck or a faceplate.
Safer Inside
Jaw Use
Bar Stock
Safer Outside
Jaw Use
Shallow
Bar Stock
Safer Outside
Jaw Use
Shallow
Bar Stock
Unsafe Jaw Position and
Poor Scroll Gear Engagement
Safer Inside
Jaw Use
Cylinder
Poor Scroll
Gear Engagement
Figure 34. Jaw selection and workpiece holding.
O P E R A T I O N
Insufficient
Jaw Clamping
Unstable
Workpiece
Unsafe Jaw Position and
Poor Scroll Gear Engagement
Poor
Grip
Unstable
Workpiece
Unsafe Inside
Jaw Use
Unsafe Jaw Position
13" Heavy 13

4-Jaw Chuck

Refer to the Chuck Installation (see Page 33)
and Chuck Removal (see Page 34) instructions
to install or remove the 4-jaw chuck.
The 4-jaw chuck features independently
adjustable hardened steel 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.
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 death or serious personal injury.

Mounting Workpiece

1. DISCONNECT LATHE FROM POWER!
2. Place a chuck cradle or plywood on the
bedway below the chuck to protect the
bedway surfaces.
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. With help from another person or a holding
device, position the workpiece so it is
centered in the chuck.
Gearhead Lathe
®
-35-