Tailstock Adjustments; Gap Section; Belt Adjustment And Replacement - Jet ZH Series Operation And Maintenance Instructions

13.3 Tailstock Adjustments

The tailstock can be offset to cut shallow tapers
up to 5° angle. See Figure 39.
1. Loosen tailstock in position by lowering
locking handle (A).
2. Loosen socket head cap screw (B).
3. Alternately loosen and tighten front and rear
screws (C). (only front screw shown.)
The scale (D) on the end of the tailstock
indicates amount of offset, and helps when re-
centering.
Figure 39 – Tailstock adjustments
If the clamping force needs to be adjusted, use
the hex nut (E, Figure 39).
When the clamping lever is released, the
tailstock "floats" upward approximately 0.05 to
0.15mm from the bed ways through four
elastically supported bearings, which allows
easy sliding of the tailstock. The float amount of
these bearings can be adjusted by turning the
set screws (F, Figure 40) at either end.
IMPORTANT: This is a sensitive adjustment.
Always clamp the tailstock to the bed before
turning these set screws, to ensure rigidity and
prevent the bearings from crashing.
Figure 40 – Tailstock bearing adjustment

13.4 Gap Section

1. To remove the gap section (A, Figure 41),
remove four socket head bolts (B) and two
socket bolts at the ends of the rails (C).
2. Remove the two tapered alignment pins (D)
by placing the provided gap bridge pin driver
(E) over them and threading the screw (E
down into them, until the pins are loosened
enough to be pulled out.
3. Remove the gap section.
Figure 41 – Gap section
To reinstall the gap section:
4. Clean the bottom and the ends of the gap
section thoroughly.
5. Set gap section in place and align the ends.
6. Insert the tapered pins into their holes
through the gap and into the lathe bed.
7. Reinstall the six bolts (B/C), and tighten
alternately until all are snug. Make sure gap
remains aligned with the ways while
tightening the screws.

13.5 Belt Adjustment and Replacement

The belts should be inspected periodically. New
belts have a tendency to stretch slightly after a
short period of use; and prolonged use will
require that they be tightened to compensate for
normal wear.
NOTE: If a worn, cracked or frayed belt needs
replacing, replace all three as a matched set.
To adjust or replace belts:
1. Disconnect machine from power source.
2. Open end gear cover, remove lower rear
cover and lower side cover. This will expose
the motor and v-belts.
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