-22-
Model G4000 (Mfg. Since 8/09)
4. Close the jaws until they make light contact
with the workpiece, as shown in Figure 17.
Figure 17. Example of a concentric shaft
secured in the 3-jaw chuck.
5. Turn the chuck by hand to make sure the
workpiece is evenly held by all three jaws and
is centered on the chuck.
— If the workpiece is not centered, loosen
the jaws and adjust the workpiece, then
re-tighten the jaws and repeat Step 5.
— If the workpiece is centered, fully tighten
the jaws.
Removing Jaws
1. DISCONNECT LATHE FROM POWER!
2. Place a piece of plywood on the bedway to
protect it, then remove the chuck from the
lathe.
3. Lay the chuck on a flat, stable surface, then
insert the chuck key into a scroll keyway and
rotate it counterclockwise to back the jaws all
the way out of the jaw guides.
4. Thoroughly clean the jaws with shop rags
and mineral spirits, then apply a thin coat of
an anti-rust protective lubricant before storing
them in a protected location free from mois-
ture and abrasives.
Installing Jaws
1. Place the chuck on a flat, stable surface.
2. Examine the sides of the jaws—each is
stamped with a number 1 through 3. Examine
the jaw guides of the chuck—each is stamped
with a corresponding number (see Figure 18)
Note: The jaws and jaw guides are machined
to match and each jaw must be installed in its
corresponding jaw guide.
3. Insert the chuck key into a scroll keyway
and rotate it until you see the beginning of
the scroll gear's lead thread come into view
through the #1 jaw guide, then back if off
slightly until it disappears (see Figure 19).
Figure 19. Installing jaw #1.
Lead Thread
Figure 18. Jaw and jaw guide stamped with
corresponding numbers.
Jaw 1
Jaw Guide 1
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