Oct 30, 2017· Dual Wheel dual motor pedestal grinder. 164 surface feet per second with 4 hp, 3 phase motors. Model SM Pedestal Grinder Dual wheel pedestal grinder with one motor. From 6 inch to 15 inch diameter grinding wheels. 1 hp to 4 hp, 3 phase motors. From 78 to 101 surface feet per second. DYB1 High Speed Grinder