Model G0745 (Mfg. Since 11/13)
-23-
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 22. Jaw selection and workpiece holding.
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 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 (not included).
6. insert jaw #1 into the same jaw guide.
7. rotate outer ring so tip of scroll-gear lead
thread engages jaw. pull the jaw; it should be
locked into the jaw guide.
8. install remaining jaws in numerical order in
the same manner, starting to the right of the
jaw you just installed. the jaws should con-
verge evenly at the center of the chuck when
properly installed.
Tip: To ensure smooth installation, make
sure the jaws are straight up and down and
do not bind in the scroll gear.
— if the jaws do not converge evenly, remove
them. re-install the jaws sequentially 1–3,
and make sure each one engages with the
scroll-gear lead thread during its first rota-
tion.
5. rotate outer ring until tip of scroll-gear lead
thread begins to enter a jaw guide (see
figure 21).
Scroll Gear
Lead Thread
1
figure 21. lead thread entering jaw guide.
Summary of Contents for G0745
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