Commstones should be twice as long as the width of the longest flat spot and as long as will work freely between adjacent brush sets.
Our Commstones come in 6 grits for commutator or brass/copper slip rings: EC EX tra Coarse-36 Grit, C Coarse-46 Grit, M Medium-90 Grit, F Fine-120 Grit, P Polishing-220 Grit, EP EX tra Polish-320 GritWe also have 3 grits for cast iron and steel slip rings: SRC Coarse-36S Grit, SRM Medium-60S Grit, SRF Finish-90S GritCommutator stones are used for grinding commutators and slip rings into concentricity for maintenance and repair. Stone mounted on a railway handle, eX cellent with commutator that are hard to reach. 2 in X 2 in X 2 in, Commstone, Grade Ep With Short Railway Handle Comes in a 7, 9, or 12 inch variety.
