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M1109 Combo Lathe/Mill
OPERATIONS
The three-jaw scroll chuck has removable hardened steel
jaws (Figure
17). The outside of the jaws are used to
hold the workpiece from the outer diameter.
Numbered from 1–3, the jaws must be used in the match
-
ing numbered jaw guides, see Figure
18.
Note: The chuck need not be removed from the spindle to
swap the jaws.
To remove a set of jaws, do these steps:
1. DISCONNECT POWER TO THE LATHE/MILL!
2. Place a piece of wood over the ways to protect 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 surfaces.
5. Set the old jaws aside in a safe place free of mois-
ture 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
19).
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, all three jaws will converge
together at the center of the chuck.
• If the jaws do not come together, repeat this pro-
cedure until they do.
Replacing Jaws
Figure 17. Chuck and jaw selection.
Figure 18. Jaw guide number.
Figure 19. Lead thread on scroll gear.
Jaw Guide #1
Lead Thread
Jaw Numbers