Tend lathes that grind sapphire jewel-bearing blanks flat on both sides.
What does a Jewel Bearing Grinder do?
Tends lathe that grinds sapphire jewel-bearing blanks flat on both sides: Applies diamond dust to surface of grinding disk. Mounts lap in revolving chuck. Inserts single bearings into cavity at base of holder and holds bearings against revolving lap to grind them on one side. Mounts several bearings on metal disk coated with adhesive material, and holds disk against lap to grind other side of bearing.