Original Diamond D by Martindale Commutator Cleaning Stones

Quickly remove flat spots, high bars, grooves, ridges, high mica, and other commutator and slip ring defects. Regular maintenance of commutators and slip rings with these Commstones is so easy it enables you to eliminate the defects in their early stages.
With these stones, it is not necessary to take a machine out of service to resurface its commutator, thus production time is saved and time-consuming major overhauls can be prevented.These are unmounted stones (no handles).

There are advantages of grinding over turning a Commutator. Turning a commutator is an expensive operation and typically necessitates taking the machine out of service. For these reasons it is customary to postpone the turning until the machine gives serious trouble. On the other hand, if Commstones are applied as soon as the defect appears, it will be eliminated before it has a chance to become serious. A flat spot 1/16” deep will not be cleaned up until 1/16” of copper has been ground away from all other parts of the commutator. When the commutator is clean and bright all the way around, the grinding is finished and no more copper has been removed than was absolutely necessary.

Three grades are offered. Select the desired stone below.
GRADE M (Medium – 90 Grit) for use where only high mica or a small amount of copper is to be removed.
GRADE F (Fine – 120 Grit) recommended for general finishing, for periodic preventative maintenance or removing small ridges. 
GRADE P (Extra Fine or Polishing – 220 Grit) for finishing or polishing / burnishing where a high mirror-like polish is desired.

Dimensions: 3/8” x 5/8” x 6”. All three grades have these same dimensions.

Call us with any questions 602-850-7399.