Jet JTM-1254RVS, Operating Instructions Manual

Page: 13 / 52

13
8.4 Spindle brake
The spindle brake lever (Figure 8-2) is used to stop
spindle immediately instead of allowing it to coast to a
stop. Pull lever downward to apply brake. To avoid
excessive wear on components, first turn off spindle
rotation (D, Figure 8-1) before using spindle brake lever.
Figure 8-2
8.5 High-low shift lever
Motor must be stopped; turn
spindle off (D, Figure 8-1). Do not
shift High-Low Lever while motor is running, or
damage to gear system may result.
The mill head can be driven directly (High Speed) or
through the back gear (Low Speed) in the mill head.
Selection is made by changing position of shift lever.
The shift lever is located at lower right side of mill head
(Figure 8-3). The lever position closest to operator is High
setting. The lever position away from operator is Low
setting. The middle position is Neutral setting, which
allows free spindle rotation for setup work.
Rotate spindle by hand to facilitate engagement of lever.
Figure 8-3
8.6 Quill power feed lever
Do not use power feed at speeds
above 3000 RPM.
It is recommended to disengage
power feed worm gear whenever power feed is not
required. This avoids unnecessary wear on worm
gear.
Do not move Quill Power Feed
Lever unless motor is at complete
stop (spindle off – D, Figure 8-1). When changing
lever position, do it gently. If gear does not engage,
jog motor and allow it to stop before attempting to
change.
The quill power feed lever (Figure 8-4) is used to engage
and disengage quill power feed mechanism.
The power feed is engaged by pulling out knob and
rotating handle to a new locked position. When engaged,
power feed mechanism will drive spindle upward or
downward. The power feed mechanism will not drive
spindle when handle is in disengaged position.
Figure 8-4
8.7 Feed rate lever
The Feed Rate Lever (Figure 8-5) is used to set the per-
revolution rate of the power feed mechanism. Three feed
rates are available: 0.003-inch, 0.008-inch and 0.0015
inch per revolution. The positions are shown on indicator
plate beside feed rate lever.
The rate is selected by pulling out knob on feed rate lever
and moving handle to detent of desired feed rate.
Note:
Knob is spring loaded – pull out to rotate to new position.
Unlike other controls on the machine, the lever shifts into
engagement more easily with the motor running, and the
quill feed lever engaged.
Figure 8-5