Scroll Chuck Clamping; Changing Jaw Set - Grizzly G0765 Owner's Manual

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 22. Jaw selection and workpiece holding.
Model G0765 (Mfd. Since 5/15)
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

Changing Jaw Set

The 3-jaw scroll chuck included with the lathe
features inside and outside hardened steel jaw
sets (see Figure below), which move in unison to
center a concentric workpiece.
When installing the jaws, it is important to make
sure they are installed correctly. Incorrect installa-
tion will result in jaws that do not converge evenly
and are unable to securely clamp a workpiece.
to
Outside Set
Figure 23. Chuck and jaw selection.
Jaws are numbered from 1–3 (see Figure below).
The number is typically stamped on the side or
bottom. Jaws are designed to be installed coun-
terclockwise in numerical order in the jaw guides,
so they will hold a concentric workpiece evenly.
Jaw Numbers
Figure 24. Jaw guide and jaw numbers.
Inside Set
Jaw Guides
-25-