Jet 690082 jtm-1 - 9" x 42" 2 hp 3-phase vertical milling machine ユーザーガイド
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11.0 Operations
11.1 Operating precautions
Observe the following
instructions before using this mill.
1. Verify that spindle brake is released before
starting motor.
2. Rotate spindle by hand to facilitate meshing of
clutch and gears.
3. Do
not use quill power feed at speeds above
2700 RPM.
4. It is recommended that power feed worm gear
be disengaged whenever power feed is not
required. This will avoid unnecessary wear on
worm gear.
required. This will avoid unnecessary wear on
worm gear.
5. The power feed can be used for drills up to
3/8” diameter (in mild steel). Use manual feed
for drills larger than 3/8”.
for drills larger than 3/8”.
6. Overload clutch is factory-set to hold up to 200
lb. downfeed pressure on the quill (accom-
modates drills up to 3/8”). Do not attempt to
adjust clutch pressure.
modates drills up to 3/8”). Do not attempt to
adjust clutch pressure.
7. If using longitudinal table travel only, clamp
saddle and knee in place using the locking
handles; this will add rigidity and provide for
heavier cuts with minimal vibration. If not using
longitudinal travel, keep table locking handles
tightened.
handles; this will add rigidity and provide for
heavier cuts with minimal vibration. If not using
longitudinal travel, keep table locking handles
tightened.
8. On heavy milling work, keep head as close to
column as possible to obtain maximum rigidity.
Always tighten ram locking handles securely.
Always tighten ram locking handles securely.
9. Do not engage back gear (“IN” position of D,
Figure 5) while leaving speed range selector
(B, Figure 5) in high position (facing operator).
This may cause gearing system to bind up.
(B, Figure 5) in high position (facing operator).
This may cause gearing system to bind up.
11.2 Clamping workpiece to table
1. The worktable has 5/8-inch T-slots for
clamping work piece to table.
2. Set switch to OFF position.
3. Place work piece on table.
4. Clamp work piece using T-slot clamps, studs,
and step blocks as required (Figure 6).
Figure 6
11.3 Changing speed range
Rotate spindle by hand to
ensure clutch is engaged prior to turning on
machine. Do not turn on machine unless
spindle can be moved freely.
machine. Do not turn on machine unless
spindle can be moved freely.
Move belt to desired set of pulleys for specific
speeds. Speed range is then set to High or Low, as
follows (refer to Figure 5):
speeds. Speed range is then set to High or Low, as
follows (refer to Figure 5):
High speed range
1. Move speed range selector (B, Figure 5) to
front position.
2. Keep back gear control lever (D, Figure 5) at
“IN” position.
3. Move spindle pulley by hand until you feel it
mesh with clutch (spindle pulley can no longer
be moved).
be moved).
4. Move back gear control lever (D) to “OUT”
position.
Low speed range
1. Move speed range selector (B, Figure 5) to
side position.
2. Move back gear control lever (D) to “IN”
position, while rotating spindle to help engage.
The above procedures are also shown on a plate
on front of mill head.
on front of mill head.
See Figure 15 for speeds of each belt position
within each range.
within each range.
11.4 Setting up for fine hand feed
Refer to Figure 7:
1. Disengage automatic feed by pulling out knob
(E, Figure 7) and moving lever to the right
hole.
hole.