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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.
IMPORTANT: 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
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 30. Jaw selection and workpiece holding.
Model G0750GV (Mfd. Since 03/18)
Insufficient
Jaw Clamping
Unstable
Workpiece
INCORRECT
Poor Grip
Unstable
Workpiece
INCORRECT
Unsafe Inside
Jaw Use
Poor Scroll
Gear
Engagement
INCORRECT
Unsafe Jaw Position
INCORRECT
Chuck Jaw Reversal
This chuck has 2-piece jaws that consist of a
reversible top jaw and a master jaw. The top jaw
can be removed, rotated 180°, and re-installed in
the reverse position for additional work-holding
options. When reversing the top jaws, always
keep them matched with their original master jaw
to ensure the best fit.
To reverse 2-piece jaws:
1.
DISCONNECT MACHINE FROM POWER!
2.
Remove cap screws that secure top jaw to
master (bottom) jaw.
3.
Remove top jaw, rotate it 180°, then re-install
it with longest cap screw in tallest portion of
jaw.
4.
Repeat Steps 2–3 with each remaining jaw
(we recommend only reversing one jaw at a
time to keep all original parts together).
Short Cap Screw
Figure 31. Reversing the chuck jaws.
Long Cap Screw
Rotate Top
Jaw 180º
-31-
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