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G0492 12" X 36" Combo Lathe/Mill
To remove a set of jaws:
1. DISCONNECT POWER TO THE LATHE/
MILL!
2. Place a piece of wood over the ways to pro-
tect them from potential damage.
3. Turn the chuck key counterclockwise and
back the jaws out.
4. Clean the jaw mating surfaces and apply a
film of white lithium grease to the mating sur
-
faces.
5. Set the old jaws aside in a safe place free of
moisture and abrasives.
6. Rotate the chuck key clockwise until you see
the tip of the scroll-gear lead thread just begin
to enter jaw guide #1 (see Figure
13).
7. Insert jaw #1 into jaw guide #1 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 on the jaw now and it should
be locked into the jaw guide.
9. Repeat the steps on the remaining jaws.
— If installed correctly, the three jaws will
converge together at the center of the
chuck.
— If the jaws do not come together, repeat
this procedure until they do.
The three-jaw scroll chuck has removable hard-
ened steel jaws (Figure
11). The outside of the
jaws are used to hold the workpiece from the outer
diameter.
Figure 11. Chuck and jaw selection.
Figure 12. Jaw guide number.
Figure 13. Lead thread on scroll gear.
Jaw Guide #1
Lead Thread
Jaw Numbers
Numbered from 1–3, the jaws must be used in the
matching numbered jaw guides, see Figure
12.
Note: The chuck need not be removed from the
spindle to swap the jaws.
Replacing the Jaws