Accu-Turn 8944, Operation And Maintenance Manual

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9
ACCU-TURN MULTI-SPEED BRAKE LATHE
OPERATION PROCEDURES
OPERATION
The 8944 Multi-Speed Lathe has multiple spindle speeds and
infinitely variable cross feeds (.001 to .010 per revolution) to
accommodate a wide range of machining tasks. It is important to
remember that the desired surface finish depends on the correct
relationship of the spindle speed with the cross feed speed. As a
general rule, slower spindle speeds require slower cross feed
speeds. Also deeper cuts normally dictate that a slower cross feed
rate and/or spindle speed may be necessary.
Multi-Speed Settings
The 8944 Multi-Speed Brake Lathe has three different pulley
selections.
(1)
The small pulley at the motor in conjunction with the large
pulley at the gear box drives the spindle at 100 RPM's. This
speed is recommended on large diameter drums, rotors, and most
flywheels; the cross feed rate should be set at a slow
setting. Position feed rate indicator between "0" and "3".
(2)
The middle pulleys rotate the spindle at 150 RPM's and are
normally used to machine intermediate size rotors and drums
that have a larger diameter than most used on passenger cars.
At this spindle RPM, cross feed can be set at a slow to medium
feed rate. Position feed rate indicator between "2" and "5".
(3)
The large pulley at the motor and the small pulley at the gear
box allows the spindle to rotate at 200 RPM's. This spindle
speed should be satisfactory for most passenger car drums and
rotors. The cross feed speed may be set at a variety of rates
from slow to fast to produce the desired finish. Position the
feed rate indicator between "3" and "8".
Note: High pitch squeals may occur if cross feed rates are set too
slow. It may be necessary to advance the cross feed rate slowly to
eliminate the noise. If chatter occurs, the cross feed rate should
be adjusted to a slower feed rate.