Martindale GRDR300 Commutator Grinding Tool with 10" Base

The Martindale Commutator Grinder assures concentricity of the commutator or slip-ring by precision grinding while it is turning in its own bearings at operating speeds and temperatures, with centrifugal force holding each bar in place.

Tool can be quickly changed from right to left hand operation. Remove two screws and turn the cross-slide around. The right-angle driving shaft is removed and inserted in the other side of the right-angle housing, and the grinding head cross-slide turned around.

When grinding use 2" x 2" x 8" Commstones in any of the 5 grades. The stones will grind 1" beyond the grinder base at each end, and they can be cocked to get into the corner at the riser.

If very deep grooves must be removed, the Turning Tool Head (GRDR505) may be used. It is interchangeable with the Grinding Head. The top of the commutator should rotate away from the operator so that if the mounting should slip, the tool bit would be pushed away from the commutator instead of digging in. It is necessary to add 4" to the grinder base length when using the Turning Tool.