TM 9-3417-215-14&P
OPERATING INSTRUCTIONS
The operation of the #4 Milling Machine is so simple that no specific instructions are required.
For possible
assistance, the following is suggested:
Spindle Speeds: To change spindle speeds, raise the motor, place the driving V belt in the proper groove on the
motor pulley and in the corresponding groove on the spindle pulley. The smallest groove on the motor pulley produces the
slowest spindle speed.
Power Feed Speeds: There are four alternative longitudinal table feed speeds for each spindle speed. The smallest
groove on the power feed drive pulley (attached to the spindle) provides the slowest table feed.
Power Feed: To engage the power feed, depress the power feed pawl (part B-713) while the motor is running.
Throwouts (parts B-723) may be set to disengage the power feed automatically where desired. The table feed may also
be stopped by turning off the motor or by manually disengaging the pawl. Reversing the motor will reverse the direction of
table travel.
Gib Adjustment: Adjustable gibs are provided between the table and saddle (table gib), saddle and knee (saddle gib),
and knee and column (knee gib). The saddle and knee gibs are each provided with three adjusting screws, the center one
of which is the lock screw.
After the machine has been set up for a particular horizontal milling operation, lock
the saddle and knee gibs in place. This will assure additional rigidity. The table gib is provided with four adjusting set
screws and nuts.
The tension on each of these screws should be approximately the same, with the
nuts tightened in place to maintain constant torque.
Starting Switch: To reverse the direction of rotation of the motor, turn the drum type switch handle to the neutral
position, and allow the motor to come to a complete stop. Then turn the switch handle to the reverse position.
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