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Model G0768/G0769 (Mfd. Since 8/15)
-35-
Figure 31. 4-jaw chuck tightening sequence.
1
2
3
4
Workpiece
Center Point
Figure 32. Example of a non-cylindrical
workpiece correctly positioned on a 4-jaw chuck.
4-Jaw Chuck
Refer to the Chuck Installation subsection for
instructions on installing the 4-jaw chuck.
The 4-jaw chuck features independently adjust-
able 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 dynamic forces involved in
machining a non-concentric or off-center
workpiece, always use a low spindle speed
to reduce risk of workpiece coming loose
and being thrown from lathe, which could
cause death or serious personal injury.
Mounting Workpiece
1.
DISCONNECT MACHINE FROM POWER!
2.
Use an appropriate device to protect ways
(refer to
Installation & Removal Device
subsection).
3.
Use chuck key to open each jaw so work-
piece will fit into spindle opening and lay flat
against chuck face and jaw steps.
4.
With help from another person or a holding
device, position workpiece so it is centered in
chuck.
5. Tighten each jaw in small increments. After
tightening first jaw, continue tightening
remaining jaws in an opposing sequence,
similar to sequential order shown below.
6. After workpiece is secured by jaws, use dial
indicator to make sure workpiece is centered
in chuck.
— If workpiece is not correctly centered,
make fine adjustments by slightly
loosening
one jaw and tightening opposing jaw until
workpiece is correctly positioned (see
below for an example).