Jet JTM-1254VS, Operating Instructions And Parts Manual

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Figure 9-2
10. Recheck perpendicularity using the dial indicator.
Repeat above procedure until dial indicator reads
zero in both positions.
11. Tighten the four hex nuts. Tighten in two steps using
a calibrated torque wrench. Use a crossing pattern
to tighten the nuts. Tighten initially to 25 foot-pounds,
then tighten to a final torque of 50 foot-pounds.
Apply torque in two steps using
a crossing pattern. Failure to do so could distort
face of ram adapter.
9.2 Positioning ram
9.2.1 Positioning ram fore and aft
1. Loosen two ram lock bolts (C, Figure 9-3) that lock
the ram to its ways.
2. Turn ram pinion (D) with a wrench to slide ram on its
ways.
3. When desired position is reached, tighten ram lock
bolts (C) securely.
Figure 9-3
9.2.2 Positioning ram on turret
Make sure machine base is secured
to floor before repositioning ram. The center of
gravity can shift enough to cause machine to tip over,
resulting in serious injury to operator and damage to
machine.
1. Loosen four turret lock bolts (E, Figure 9-3) that
clamp the ram to the top of the base. One-half (1/2)
turn should be sufficient to allow turret to move.
Note: Use gentle hand pressure to avoid rapid
movement.
2. Turn ram until spindle is in desired position. Use
scale on turret for degree measurement.
3. Tighten four turret lock bolts (E). Tighten in two steps
using a calibrated torque wrench. Use a crossing
pattern to tighten the nuts. Tighten initially to 25 foot-
pounds, then tighten to a final torque of 50 foot-
pounds.
9.3 Gib adjustment
The table, saddle and knee are equipped with adjustable
gibs. The gibs may require adjustment if unusual
vibration is noted when the locking mechanisms are off,
or if you experience unusual vibration when spindle
speed, tooth pitch or depth of cut do not account for the
vibration.
NOTE: When adjusting gibs, always start with knee first;
adjust saddle second, and adjust table last.
Figure 9-4
9.3.1 Knee gib adjustment
The knee gib adjustment screw (A, Figure 9-4) is located
under chip wiper at rear of knee where it contacts column.
Remove way cover and wiper to expose gib adjustment
screw. Tighten screw until slight drag is felt when turning
knee crank.
9.3.2 Saddle gib adjustment
The saddle gib adjustment screw is on left front of saddle
(B, Figure 9-4). Tighten screw until slight drag is felt when
turning cross-feed crank.