Four-Jaw Chuck - Grizzly G0709 Owner's Manual

four-Jaw chuck

this section outlines basic operation safety related
to using the 4-jaw chuck included with your lathe.
use knowledge of safety and common sense
when applying the steps on how to use this chuck.
if you have any questions, feel free to contact our
technical support department.
select this chuck for low-speed lathe operations
only. the 4-Jaw chuck uses independently adjust-
able jaws, meaning each is adjusted by an individ-
ual worm gear. non-cylindrical parts can be held
and brought into the spindle centerline for facing
or boring. the other benefit is that the majority of
a workpieces can be positioned out of the spindle
rotation axis if a bore or step needs to be cut into
a workpiece on an outlying edge.
For the best grip possible on odd-shaped
workpieces, one or more jaws can also be rotated
180° to grab more surface area for clamping.
if all four jaws cannot be used to hold the workpiece,
you must use the faceplate for improved clamping
options. otherwise, a severe out-of-balance con-
dition will be created. if spun even at an average
speed, this chuck will almost always be out of bal-
ance, and the machinist and bystanders will be at
risk of being hit with a thrown workpiece. Being hit
by an ejected workpiece can be fatal.
Reversing Jaw positions & clamping
a Workpiece
shown in figure 27 is an example of the inde-
pendent jaws holding a non-cylindrical workpiece
for off-center boring. one or more jaws can be
reversed in any combination to get the best grip
on the workpiece.
figure 27. Four-jaw chuck independent
jaw-clamping with two jaws reversed.
Model G0709 (Mfg. Since 5/11)
To use the 4-jaw chuck:
1. disConneCt lAthe FroM poWer!
2. install a center in the tailstock.
3. open each jaw with the chuck wrench and
place the workpiece flat against the chuck
face.
4.
support the workpiece and slide the tailstock
forward so the tip of the dead center presses
against the workpiece. next, lock the tailstock
in position. For more information, refer to the
tailstock controls on page 67 and centers on
page 33.
5.
turn the tailstock quill so the dead center
applies enough pressure to the center point
of your workpiece to hold it in place (see
figure 28), then lock the tailstock quill.
First
third
figure 28. Centering workpiece (tool post
removed for clarity).
6.
turn each jaw until it just makes contact with
the workpiece.
7.
tighten each jaw in small increments. After
adjusting the first jaw, continue tightening in
opposing sequence (see figure 28). Check
frequently to make sure the required point on
the workpiece has not wandered away from
the spindle centerline due to applying too
much pressure to a single jaw.
Fourth
second
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