Martindale GRDR720 Chain-Drive Commutator Grinding Tool 20" Base Length

Designed at the request of the Railroad Industry, but equally suited for grinding commutators of industrial equipment up to 26" long. The Martindale Chain-Drive Commutator Grinder is a departure from previous designs, in that friction has been reduced to a minimum. Grinding dust has little effect on the operation. Two or three turns of the crank will move the carriage from one end of the bed to the other. The operator can "feel" the stone cut, and how fast to feed it. This is probably the quickest and easiest Commutator Grinder to use.

A Universal Adjustable Support is available for mounting on round brush arms. This support is in two parts, hinged together. It can be used with grinder mounted on top section and bottom section adjusted at desired angle; or top half can be removed and grinder mounted directly on lower part of support. Split fibre bushings reduce the clamp from 1-1/8" diam. to 3/8" diam. in 1/8" steps to make a tight fit on the brush stud.