Gib Adjustments; Tailstock Off-Set; Removing Gap Bridge - Jet GH-1440ZX Operation And Maintenance Instructions

Figure 24 – Chuck jaw reversal

14.2 Gib adjustments

After a period of time, some moving components
may need adjustment for play (or "backlash") due
to wear. Do not overtighten gib screws as this can
hasten wear to components.
14.2.1 Saddle
Turn gib screws on either side of the saddle at the
rear to adjust the drag on the saddle.
14.2.2 Cross slide
Gib screws are located at front and rear of slide
opposite to one another (A, Figure 25). To adjust
drag, loosen rear gib screw one turn, and tighten
front gib screw a quarter turn. Rotate handwheel to
check play. Repeat as needed until slide moves
freely without play. Gently tighten rear gib screw.
14.2.3 Compound rest
Gib screws are located at front and rear of
compound rest (B, Figure 25). To adjust, use same
method as for Cross Slide.
Figure 25 – Gib adjustments, slide and rest
14.2.4 Half Nut
Gib screws are located on right side of apron (C,
Figure 26). Loosen the jam nuts and rotate the
screws clockwise until any backlash is corrected.
Then re-tighten nuts.
Figure 26 – Half nut gib adjustment

14.3 Tailstock off-set

Follow the procedure below to off-set the tailstock
to cut shallow tapers:
1. Loosen tailstock in position by lowering locking
handle (B, Figure 27) and loosening hexagon
head eccentric shaft at back of tailstock.
2. Alternately loosen and tighten front and rear
screws (D, Figure 27). Note: Front screw is
shown.
The scale on the end of the tailstock base indicates
amount of offset, and helps when re-centering.
If clamping force needs to be adjusted, use the hex
nut beneath the tailstock body.
Figure 27 – Tailstock offset

14.4 Removing gap bridge

1. To remove the gap bridge, remove four hex
socket cap screws, and two hex cap bolts.
2. Tighten the hex nuts on the tapered alignment
pins to loosen the pins. Once loosened, they
can be removed.
3. Gap bridge can now be removed.
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