Jet JVM-836, Operating Instructions And Parts Manual

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11.5.1 Cross feed backlash adjustment
Refer to Figure 14:
1. Use cross feed crank to move table to extreme
rear of its travel (toward column).
2. Remove pleated way cover.
3. Open the two chip guards (#77,78, sect.
13.4.1) enough to expose cross feed
adjustment nut (the nut toward rear of feed nut
bracket is not adjustable; only front nut is
adjustable).
4. Loosen the two nut locking screws.
5. Turn nut slightly to tighten it against opposing
nut.
6. Tighten the two nut locking screws.
7. Using cross feed crank, move table to middle
position.
8. Set up a dial indicator to check cross feed
backlash. Gently move cross feed crank back
and forth while watching dial indicator.
Backlash should be between 0.003 inch and
0.005 inch.
9. If necessary, repeat the above steps.
10. Install pleated way cover.
11.5.2 Longitudinal backlash adjustment
Refer to Figure 14:
Only one of the longitudinal lead screw nuts can be
adjusted; the other nut is fixed. The left hand nut is
typically adjustable. This can be determined by
looking at nut from underside of table.
1. Loosen the two nut locking screws.
2. Turn the nut slightly to tighten it against the
opposing nut.
3. Tighten the two nut locking screws.
4. Using one of the longitudinal table cranks,
move table to middle position.
5. Set up a dial indicator to check longitudinal
backlash. Gently move crank back and forth
while watching dial indicator. The backlash
should be between 0.003 inch and 0.005 inch.
6. If necessary, repeat the above steps to set
backlash.
Figure 14: Lead screw backlash adjustment