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SPINDLE SPEEDS:
When using Carbide Saws, the large pulley would be on the motor and the small pulley on
the spindle.
When using High Speed Steel Saws, the large pulley should be on the saw spindle and the
small pulley on the motor.
OPERATION:
FOR HORIZONTAL COMMUTATORS
Put a saw of the desired thickness on the saw spindle. Mount an armature on the V-supports
or centers. Place a bubble level (a combination square head works fine for horizontal or ver-
tical commutators) on the base plate dovetail, and match the setting on the commutator by
adjusting the front or rear height adjusting knobs (30-7). If the V-supports are
used, keep them in as close to the armature as possible to prevent fore or aft movement of
the armature, but not so close as to bind and prevent rotation for indexing. Retract or
remove the centers to prevent damage to the armature. Each V-support has a vertical
adjustment of 1" for bearings or shafts of different diameters. One of the centers is spring-
loaded to make mounting of several armatures of the same size easier. The spring loaded
center may be locked in position for heavier work.
Using the operating handle, push the carriage back until the saw is positioned to cut as close
to the riser as desired. Loosen the thumbscrew and set the stop rod to limit the carriage trav-
el.
With the saw at riser end of the commutator, turn the motor on and lower the saw into the
mica strip to the desired cutting depth using the hand wheel (30-30) on the vertical adjust-
ing screw. The arbor is lowered by turning the hand wheel counter-clockwise: (.050 to each
revolution.) (loosen the screw with T-Knob on the motor support before adjusting the vertical
screw, and tighten it after adjustment.)
Start the cut at the back of the commutator and pull the saw toward you at an even rate until
the slot is cut the entire length. At the end of the slot, lift up slightly on the operating handle
to raise the saw up out of the slot, above the level of the commutator and return the saw
arbor back to the riser. Index the commutator to center the saw on the next mica strip, lower
the handle slowly to let the saw enter the mica and pull the saw through this second strip,
etc. Lifting the saw out of the cut when returning the saw arbor back to the riser end for the
next cut lengthens the saw life and reduces the chance for accidental damage to the com-
mutator.
FOR VERTICAL COMMUTATORS:
Mount the armature in the same manner as for the horizontal commutators.
Fasten the end of the operating handle (30-18) to the bottom of the bottom end of the car-
PO Box 430 Cleveland, OH 44107 • Phone (216) 521-8567 • Fax Local 521-9476 / USA & Canada (800) 344-9191
E-Mail: sales@martindaleco.com • Website: www.martindaleco.com
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