Model G0740 (Mfg. Since 11/12)
-35-
This 3-jaw scroll-type chuck has an internal
scroll-gear
that moves all jaws in unison when
djusted 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 an
d may throw
! Instead, use an independent jaw
Insufficient
Jaw Clamping
Unstable
Workpiece
Bar Stock
Cylinder
Unsafe Jaw Position
Poor Scroll
Gear Engagement
Safer Inside
Jaw Use
Unsafe Inside
Jaw Use
Unsafe Jaw
Position
Safer Outside
Jaw Use
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Poor Scroll
Gear
Engagement
Poor Grip
Unstable
Workpiece
Shallow
Bar Stock
Shallow
Bar Stock
Safer Outside
Jaw Use
Safer Inside
Jaw Use
CORRECT
CORRECT
CORRECT
CORRECT
INCORRECT
INCORRECT
INCORRECT
INCORRECT
Scroll Chuck
Clamping
Figure 36. Jaw selection and workpiece holding.
Chuck Jaw Reversal
This chuck has 2-piece jaws that consist of
a 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!
Remove the cap screws that secure the top
jaw to the master (bottom) jaw.
. Remove the top jaw, rotate it 180°, then re-
install it with the longest cap screw in the tall-
est portion of the jaw.
. Repeat Steps 2–3 with each remaining jaw
(we recommend only reversing one jaw at a
time to keep all original parts together).
Master Jaw
Rotate Top
Jaw 180º
Long Cap ScrewShort Cap Screw
Figure 37. Reversing the chuck jaws.
