A professional who operates grinding machine to grind blocked watch parts to size. Respnsibilities include:

• Places blocks on magnetic chuck and regulates feed and depth of grinding wheel cut to grind parts to specified thickness, working to tolerances of 0.0005 to 0.0001 inch.
• Removes blocks to measure thickness with upright gauge to ensure conformance to specifications.
• Dresses chuck by running grinding wheel across chuck slowly.
• Laps part for finish after grinding by putting blocks, parts side down, under pressure pads of lapping machine, putting oil and emery on lapping surface, and setting timer for specified time.