Using the four-jaw chuck – Woodstock M1109 User Manual

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M1109 Combo Lathe/Mill

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.