-26-
Model M1112 (For Machines Mfd. Since 12/20)
O
PE
R
ATIO
NS
Four-Jaw Chuck
Four-jaw chucks feature hardened steel jaws that are
adjusted independently. Each jaw can be removed
from the chuck body and reversed. Independent jaw
adjustment and re versal allows for a wide range of work
holding versatility.
To install the four-jaw chuck, refer to the
Mounting
Chuck or Faceplate
procedures on
Page 22
.
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.
Position and lock the tailstock, then turn the
tailstock quill so the dead center makes contact or
is close to the center point of your workpiece (see
Figure
32).
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 up and down when the chuck
is rotated if the workpiece is out of center.
PINCH HAZARD! Protect your hands
and precision ground bedways
with plywood when removing lathe
chuck! The heavy weight of a fall-
ing chuck can cause serious injury.
Figure
31
.
Simple chuck cradle made of
scrap lumber.
Figure
32
.
Clamping workpiece.
Securely clamp your workpiece and
remove the chuck key! Thrown objects
from a lathe can cause serious injury or
death to the operator and to bystanders
many feet away.
