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