Grinding and Finishing Illegitimi non carborundum ver. 1 1. ME 338: Manufacturing Processes II ... • The grinding wheel rotates at 3600 rpm, has a diameter (D) of 150 mm, thickness (b) of 25 mm, and (c) 5 grains per mm2. The motor has a power of 2 ... cylindrical part. (a) Cylindrical mircohoning, (b) Centerless microhoning.