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90 grit abra abrasive grain abrasive wheel alumi aluminum oxide abrasive aluminum oxide grain applied artificial aluminum oxide bearings belt bevel brass brush buffing operation canvas cast cast-iron laps cemented cent coated abrasives compositions corundum Crankshafts crystals cutting agent degrees Fahr diamond disks drying room edge emery F grit fast cut feet per minute flat Flour gears glass glue grade Gray iron grinder grinding wheel hard Hypoid inches diameter lapping machine lapping operation leather Lenses loose abrasive material medium method micro-inches root mean Monel metal Optical oscillating plug gages polishing operation polishing wheels pound pressure produce profilometer pumice putty powder raceways remove revolutions per minute revolving roll root mean square Rouge rough polishing sand sand-cast scratches setup room shape sheet silicon carbide grain sizes smooth soft soluble oil speed spindle stainless steel surface feet temperature thick tool tough trued usually vitrified bond worm gear Worms