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Jewel Bearing Maker

Grind, drill, and finish sapphire jewel bearings.

What does a Jewel Bearing Maker do?

Grinds, drills, and finishes sapphire jewel bearings for use in precision instruments, such as compasses, meters, and chronometers: Grinds and faces sapphire blanks to flatten surfaces, and turns edges, to form bearings of specified size and thickness. Drills and finishes holes in centers of bearings.