Jet JTM-1050, Operating Instructions And Parts Manual

Page: 12 / 36

12
10.0 Operating controls
Refer to Figure 5.
A. Variable speed control (A, Figure 5) –
located on right side of head assembly. Turn
clockwise or counterclockwise to adjust
spindle speed.
Change speed only when
motor is running. Failure to comply may
result in damage to drive mechanism.
Figure 5: Controls
B. Variable speed dial indicator (B) - located
on front of head assembly. Indicates
selected speed in high or low range.
C. Spindle brake (C) - located on left side of
head. Move in either direction to stop
spindle once power has been turned off.
D. High-Neutral-Low Lever (D) - located on
right side of head. Upper position is high
speed. Middle position is neutral. Lower
position is low speed (back gear
engagement).
Do not shift High-Low
Gear (D) while motor is running. Turn off
machine and rotate spindle by hand to
facilitate changing lever positions.
E. Auto feed engagement lever (E) - located
on right side of head. When lever is in the
right hole, the auto feed worm gear is
disengaged. To engage auto feed, pull knob
out and move lever around to opposite hole.
Engage pin in hole.
Auto feed may be
engaged when spindle is rotating,
however, it must be engaged gently to
avoid damage to worm gear.

Do not use auto feed at speeds above
3000 R.P.M.

It is recommended that auto feed
worm gear be disengaged whenever
auto feed is not required. This avoids
unnecessary wear on the worm gear.

Maximum auto feed loading is a 3/8"
(9.5mm) diameter bit for drilling in
steel. Use manual feed for bits larger
than 3/8".
F. Coarse feed handle (F) - located on right
side of head. Used for non-precision drilling
operations and for moving quill to a specific
depth. Rotate clockwise to lower spindle. A
return
spring will retract spindle
automatically once handle is released.
G. Quill lock (G) - located on right side of
head. Rotate handle clockwise to lock quill
in desired position. Rotate handle counter-
clockwise to release.
H. Micrometer adjusting nut (H
1
,H
2
) - located
on front of head. Used for setting spindle
depth, according to the adjoining scale. Use
jam nut (H
2
) to secure setting of adjusting
nut (H
1
). Note: One complete rotation of the
micrometer adjusting nut equals 0.05”.
I. Feed trip control lever ( I ) - located on left
side of head. Engages overload clutch on
pinion shaft when lever is positioned to the
left. Stays engaged until quill stop comes
into contact with micrometer adjusting nut
(forcing feed control lever to drop out
automatically), or until lever is released
manually by positioning lever to the right.
J. Manual feed handwheel (J) – located on
left front of head. Feed direction control
knob (K) must be in neutral position. The
feed control lever (
I ) must be engaged.
Note : Manual feed handwheel may be
taken off when not in use.
K. Feed direction control (K) – located in
center of manual feed handwheel. Position
of knob depends upon direction of spindle
rotation. If boring with right hand cutting
tools, pull feed knob towards operator until