A professional who tends machine that conveys flat glass or mirrors under polishing (blocking) and cleaning heads to polish and clean glass surface. Responsibilities include:

• Mixes polishing compound according to formula and pours compound into storage tank.
• Feeds glass or mirrors onto conveyor of machine.
• Pushes button to start machine and pulls lever to start flow of polishing compound onto glass or mirror surface.
• Pushes button to raise or lower polishing heads and cleaning brushes individually or collectively according to size, thickness, and number of glass pieces.
• May record production.