Tend grinding machines that grind sapphire squares to disk shape.
What does a Machine Turner do?
Tends grinding machine that grinds sapphire squares to disk shape, for use as jewel bearings: Glues specified number of sapphire squares together to form stack. Positions stack between abrasive and rubber rolls of grinding machine and starts machine that grinds sapphires to disk shape. May operate similar machine equipped with diamond-dust-coated wheel to smooth edges of sapphire disk.