Jet JTM-1, Operating Instructions And Parts Manual

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12.2 Head movement: Fore and aft
1. Setting the angle:
a. Loosen the three ram adapter locking bolts
(A, Figure 10). It is unnecessary to loosen the
bolts more than one-half (1/2) turn to allow
tilting.
Figure 10: Head movement
b. Support mill head with your free hand.
Press upward on spindle when changing the
angle.
c. Turn ram adapter worm nut (B, Figure 10)
to tilt head forward and backward. Use scale
on ram adapter to establish desired angle.
2. Returning to upright position:
a. When returning mill head to full upright
position, be sure to support head by upward
pressure on spindle as you turn worm nut.
b. Check to make sure mill head is perpen-
dicular to worktable.
c. Set up a dial indicator in a collet and secure
using draw bar (refer to Figure 9).
d. Place spindle drive in neutral.
e. Set dial indicator plunger on worktable.
Zero indicator.
f. Rotate spindle 180 degrees (when rotating,
raise dial indicator plunger by hand to prevent
it from dropping into table T-slots).
g. Read dial indicator – it should read zero. If
not, loosen the four hex nuts and reposition
mill head.
h. Recheck perpendicularity using dial
indicator. Repeat above procedure until dial
indicator reads zero in both positions.
i. When indicator reads zero, tighten ram
adapter locking bolts (A, Figure 10).
12.3 Positioning ram
12.3.1 Sliding ram fore and aft
1. Loosen two bolts (A, Figure 11) that lock ram
to its ways.
Figure 11: Ram positioning
2. Turn lever (B, Figure 11) to move ram on its
ways.
3. When desired position is reached, lock bolts
(A, Figure 11) securely.
12.3.2 Rotating ram on its 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 (C, Figure 11).
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 to establish turn degree.
3. Tighten four turret lock bolts (C. Figure 12).
12.4 Feed trip adjustment
If feed trip mechanism does not disengage properly
when micrometer nuts contact quill stop, adjust as
follows.
Refer to Figure 12:
1. Loosen locknut (A, Figure 12).
2. Engage trip lever (I) by pulling away from head
assembly.
3. Adjust micrometer nuts (H) against quill stop
(L).
4. Slowly turn adjusting screw (B) with provided
hex key until lever (I) trips.
5. Tighten locknut (A).