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M1109 Combo Lathe/Mill
OPERATIONS
Using the Four-Jaw Chuck
To install the four-jaw chuck, do these steps:
Refer to the Three-Jaw Direct Mount Scroll Chuck pro
-
cedures on Page 15 to mount the four-jaw chuck.
To load a workpiece in the four-jaw chuck, do these
steps:
1. Using the chuck key, open each jaw so the
workpiece will lay flat against the chuck face
.
2. Support the workpiece.
3. Lock the tailstock and then turn the tailstock quill
so the dead center makes contact or is close to the
center point of your workpiece
(see Figure 20).
4. Turn each jaw until it just makes contact with the
workpiece.
5. In an opposing pattern, tighten each jaw in small
increments. After you have adjusted the first jaw,
continue tightening the opposing jaw. Check the
dead center alignment frequently to make sure
you have not wandered off your index point due to
applying too much pressure to a single jaw.
6. After the workpiece is held in place, back the
tailstock away and rotate the chuck by hand. The
center point will move if the workpiece is out of
center.
7. Make fine adjustments by slightly loosening one jaw
and tightening the opposing jaw until the workpiece
is precisely aligned. Use a dial indicator for fine tun
-
ing adjustments in alignment
(see Figure 21).
8. Use a lower RPM when machining heavy eccentric
workpieces.
PINCH HAZARD! Protect your hands
and precision ground bedways with
plywood when removing lathe/mill
chuck! The heavy weight of a fall
-
ing chuck can cause serious injury.
Figure 20. Clamping workpiece.
Figure 21. Centering workpiece.
Securely clamp your workpiece and
remove the chuck key! Thrown objects
from a lathe/mill can cause serious injury
or death to the operator and to bystand
-
ers many feet away.