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4.
Insert chuck screws through mounting holes
in spindle backplate, as shown in Figure 25.
Make sure chuck seats firmly and evenly
against backplate shoulder.
Spindle
Backplate
Chuck Screw
Figure 25. Inserting chuck into backplate.
5.
Use a lock washer and hex nut on each
chuck screw to secure chuck (see Figure
26). Tighten hex nuts evenly a small amount
at a time and in multiple steps.
Hex Nut
Flat Washer
Figure 26. Chuck secured against backplate.
Model G0768/G0769 (Mfd. Since 8/15)
Scroll Chuck
Clamping
This 3-jaw, scroll-type chuck has an internal scroll-
gear that moves all jaws in unison when adjusted
with the chuck key. This chuck holds 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
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
CORRECT
Unsafe Jaw Position and
Poor Scroll Gear Engagement
Safer Outside
Jaw Use
Shallow
Bar Stock
CORRECT
Safer Outside
Jaw Use
Shallow
Bar Stock
Unsafe Jaw
Position
CORRECT
Safer Inside
Jaw Use
Cylinder
Poor Scroll
CORRECT
Gear Engagement
Figure 27. Jaw selection and workpiece holding.
or
positions
Insufficient
Jaw Clamping
Unstable
Workpiece
INCORRECT
Poor Grip
Unstable
Workpiece
INCORRECT
Unsafe Inside
Jaw Use
Poor Scroll
Gear
Engagement
INCORRECT
Unsafe Jaw Position
INCORRECT
-33-
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