Changing Jaw Set - Grizzly G9972Z Owner's Manual

Changing Jaw Set

Tools Needed:
Chuck Wrench ................................................... 1
The 3-jaw scroll chuck included with the lathe fea-
tures inside and outside hardened steel jaw sets
(see Figure 19), 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.
Outside
Set
Figure 19. Chuck and jaw selection.
Jaws are numbered from 1–3 (see Figure 20).
They are designed to be installed in numerical
order in the jaw guides so they will hold a concen-
tric workpiece evenly.
Jaw
Guides
Figure 20. Jaw guide and jaw numbers.
-26-
Qty
Inside
Set
Jaw Numbers
To change the jaw set:
1. DISCONNECT LATHE FROM POWER!
2. Place a piece of plywood over the bedways to
protect them from potential damage.
3.
Insert the chuck key and turn it counterclock-
wise to back the jaws out and remove them.
4.
Use mineral spirits to clean the debris and
grime from the jaws and chuck jaw guides.
5. Apply a thin coat of white lithium grease to
the surfaces of the removed jaw set. Store
in a safe place free from moisture and abra-
sives.
6. Rotate the chuck key clockwise until you see
the tip of the scroll-gear lead thread just begin
to enter a jaw guide (see Figure 21).
Lead Thread
Figure 21. Lead thread on scroll gear.
7.
Insert jaw #1 into the jaw guide and hold the
jaw against the scroll-gear.
8.
Rotate the chuck key clockwise one turn to
engage the tip of the scroll-gear lead thread
into the jaw. Pull the jaw; it should be locked
into the jaw guide.
9.
Install the remaining jaws in numerical order,
in the same manner.
— If installed correctly, the jaws will converge
evenly at the center of the chuck.
— 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
rotation.
Model G9972Z (Mfd. Since 03/20)