Operate jewel-opening machines to smooth and polish jewel holes to size.
What does a Jewel Hole Finish Opener do?
Operates jewel-opening machine to smooth and polish jewel holes to size: Mounts wire, on which jewels are strung, in machine, pulls wire taut, and forces sleevelike devices against each end of jewel row to force jewels tightly together. Brushes shellac over jewels and allows them to harden. Starts belt which causes row of jewels to rotate around wire. Pulls diamond-dusted tapered wire back and forth through rotating jewels to enlarge and polish holes. Pulls thicker portion of wire into working position until hole reaches specified diameter. Verifies size of hole on graduated tapered needle. Works to tolerances of 0.0001 inch.