Sherline Lathe User Guide and Specifications

Remember that the circuit breaker turns the speed control off which turns off the motor.
If power were to be applied to the speed control with the motor disconnected, it could
damage the speed control.
Thermal protection is built into your motor to make sure it is not damaged by
overloading. Use good common sense when operating the motor, and it will provide
many years of trouble free operation.
Operation of the motor and electronic speed control
The lathe is supplied with an electronic speed control that produces a comprehensive
range of speeds suitable for all operations. Special circuitry designed into the DC motor
speed control automatically compensates for speed changes due to increased load. If the
spindle RPM drops noticeably when cutting, you are taking too heavy a cut. The speed
range of the spindle using the speed control is from 70 to 2800 RPM. This is achieved
without the inconvenience of changing belt positions or gear ratios as is often the case
with other designs. A second belt position is offered as an additional feature to provide
extra torque at low RPM for larger diameter parts should your job require it.
To operate the motor, turn the speed control knob counter-clockwise as far as it will go.
Then turn the toggle switch to "ON" and select the speed by turning the speed control
knob clockwise.
Motors are pre-tested at the factory
Your new motor should run smoothly the first time you use it as it has been "run in" for
about an hour before being shipped to you. Despite our secure packaging, there have been
cases where extremely rough handling by a shipper has damaged the magnets in the
motor. If the motor does not run when plugged in, turn the motor by hand. If it does not
turn smoothly, it may have been damaged in shipment. Call Sherline for instructions on
making a damage claim with the shipper. Do not attempt to repair the motor yourself.
Mounting the headstock to the lathe or mill
You may notice that the post onto which the headstock mounts is a loose fit where it
projects from the lathe bed or column saddle. This is normal, and the diagram below will
help you understand how it works.