Chuck Preparation (Three-Jaw); Break-In Period - Jet GH-1440ZX Operation And Maintenance Instructions

8.3 Chuck preparation (three-jaw)

Read
directions for chuck preparation. Failure to
comply may cause serious personal injury
and/or damage to the lathe.
The three-jaw scroll chuck is shipped pre-installed
on the lathe. It can be used for clamping cylindrical,
triangular and hexagonal stock, and has reversible
jaws.
Note: An optional 12-inch, 4-jaw chuck is available
(part no. ZX-OP-2A). See your dealer to order.
Before removing a chuck, place a flat piece of thick
plywood across the bedways under the chuck to
prevent damage to the bedways should the chuck
fall from your hands. Alternatively, many users
make a wood chuck cradle that sits atop the ways
and accepts the specific diameter of chuck, for
easier installing and removal. Figure 6 shows an
example.
Figure 6: Chuck cradle
To remove the chuck:
1. Support the chuck while turning six camlocks
1/4 turn counterclockwise with the chuck
wrench from the tool box.
2. Carefully remove the chuck from the spindle
and place on an adequate work surface.
3. Inspect the camlock studs. Make sure they
have not become cracked or broken during
transit. Clean all parts thoroughly with solvent.
Also clean the spindle and camlocks.
4. Cover all chuck jaws and scroll inside the
chuck with #2 lithium tube grease. Cover the
spindle, camlocks, and chuck body with a light
film of 20W oil.
5. Lift the chuck up to the spindle nose and press
onto the spindle. Tighten in place by turning
the camlocks 1/4 turn clockwise. The index
mark (A, Figure 7) on the camlock should be
between the two indicator arrows (B) when
tight, as shown in Figure 7.
and understand all
• If the index mark (A) is not between the two
arrows, i.e. the cam turns beyond the
indicator arrows, then remove the chuck and
turn the camlock stud IN one full turn.
• If a camlock will not engage, remove the
chuck and turn the camlock stud OUT one
full turn.
Figure 7: Camlock
6. Make sure chuck is secure on the spindle with
the camlocks correctly engaged.

8.4 Break-in period

Do not run the lathe above 560 RPM for the first six
hours of operation, to allow gears and bearings to
adapt and run smoothly.
14