Jet JTM-949EVS/230, Operating Instructions And Parts Manual

Page: 18 / 48

18
8. Set the dial indicator plunger on the work table. Zero
the indicator.
9. Rotate spindle 180 degrees (when rotating, raise dial
indicator plunger by hand to prevent it from dropping
into table T-slots).
10. Read dial indicator. The indicator should read zero.
If not, loosen the four hex nuts and reposition the mill
head.
11. Recheck perpendicularity using the dial indicator.
Repeat the procedure above until dial indicator reads
zero in both positions.
Be sure to apply torque in two
steps using a crossing pattern. Failure to do so
could distort the face of the ram adapter.
12. 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.
10.2
Mill head – fore/aft adjustment
1. Setting the angle:
a. Loosen the three ram adapter clamp bolts on
the ram (A, Figure 17). There is no need to loosen
the bolts more than 1/2 turn to allow tilting.
Figure 17
b. Support mill head with your free hand. Press
upward on spindle when changing the angle.
c. Turn ram adapter worm nut (B, Figure 21) to tilt
head forward and backward. Use scale on ram
adapter to locate desired angle.
2. Returning to upright position:
a. When returning mill head to its full upright
position, be sure to support head by upward
pressure on the spindle as you turn the worm nut.
b. Check to make sure mill head is perpendicular
to work table.
c. Set up a dial indicator in a collet and secure
using the draw bar (refer to Figure 18).
Figure 18
d. Put the spindle drive in neutral.
e. Set the dial indicator plunger on the worktable.
Zero the 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. The indicator should read
zero. If not, loosen the four hex nuts and reposition
the mill head.
h. Recheck perpendicularity using dial indicator.
Repeat the procedure above until dial indicator
reads zero in both positions.
i. When indicator reads zero, tighten ram adapter
clamp bolts.
10.3
Positioning ram
10.3.1
Positioning ram fore and aft
1. Loosen two handles (A, Figure 19) that lock the ram
to its ways. [Hex nuts on JTM-1050EVS2.]
Figure 19 (JTM-949EVS/230 shown)