Jet 691050, Operating Instructions And Parts Manual

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5. Use coarse or fine manual downfeed .
Note: A test cut is recommended to verify that
depth of cut is correct before engaging actual
workpiece.
10.5 Automatic feed
Refer to Figure 10-3.
1. Ensure quill lock (G, Figure 10-3) is loosened
by rotating counterclockwise.
2. Set micrometer nut (H) to desired depth.
3. Engage auto feed lever (E) by pulling out knob
and moving lever to the right hole.
4. Select feed direction by setting feed direction
knob (K) position per Table 4.
Spindle dir. Feed dir. Knob position
CW
Down In
Up Out
CCW
Down Out
Up In
Table 4
5. Select feed rate from feed selector knob (M). It
is easier to change feed rate while spindle is
turning.
6. Engage feed trip lever ( I ) by pulling it away
from head assembly.
Stop motor to engage
automatic feed. Auto feed may be
engaged when spindle is rotating,
however, it must be engaged
gently to
avoid damage to worm gear.

Do not use power feed at speeds
above 3000 R.P.M.

It is recommended that auto feed
lever (E) be disengaged when not in
use.

Maximum loading is a 3/8” (9.5mm)
diameter bit for drilling in steel. Use
manual feed for bits larger than 3/8".
Note: Due to variables in tool diameter, coatings,
coolant, and materials, no specific spindle speed or
feed rate recommendations are provided. Use
machinery handbooks that have data applicable to
the milling and drilling operations being performed.
Or, contact the suppliers of the tooling, coolant and
material for specific recommendations.
10.5.1 Depth stop for auto feed
Refer to Figures 9-1 and 10-3.
1. Lower quill to required depth.
2. Tighten quill lock (G, Figure 8).
3. Move micrometer nut (H) against quill stop (L).
4. Loosen quill lock (G), and engage auto feed
lever (E).
5. Choose downfeed rate (M).
6. Engage feed reversing knob (K). See Table 4.
7. Engage feed trip lever (I).
Note: A test cut is recommended to verify that
depth of cut is correct before engaging actual
workpiece.
10.6 Mill head – left/right rotation
Make sure machine base is
secured to floor before repositioning mill head.
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 large hexagonal nuts (A, Figure
10-4) that secure mill head to ram adapter.
One-quarter (1/4) turn should be sufficient to
allow the head to move.
NOTE : For angles greater than 10 degrees,
use your free hand to support mill head, taking
some weight off the brass worm gears. Doing
so will greatly lengthen life of the worm gears.
2. Turn worm shaft (B, Figure 10-4) to rotate
head left or right as required. Use scale on
ram adapter to set desired angle.
Note: The scales on ram adapter and for head
rotation are guides only. Close tolerance work
will require use of a dial indicator to make sure
head is 90° to table in X and Y axis. Please
note that table is fitted to be slightly higher in
front, usually about 0.0005”.
Figure 10-4: Mill head movement - rotation
Be sure to apply torque in two
steps using a crossing pattern. Failure to do so
could distort face of ram adapter.
3. Tighten the four hexagonal nuts (A). Tighten in
two steps using a calibrated torque wrench.
Use a crossing pattern to tighten the nuts.
Tighten initially to 25 foot-pounds.