A professional who tends machine that breaks ore, skimmings, furnace residue, clay pieces, pot-room butts, or green carbon scrap into smaller sizes for further processing. Respnsibilities include:

• Starts crusher.
• Regulates flow of materials into crusher from conveyors, chutes, or bins.
• Prods large lumps with bar to force them through crusher.
• Breaks oversize lumps with sledgehammer.
• Maintains uniform flow of crushed materials to screens or roll crushers for further sizing by controlling movement of conveyor belt or feeder.
• Cleans, lubricates, and makes minor repairs to crusher.
• May remove scrap wood or iron by hand or with an electromagnet.
• May operate vibrating screens to separate materials within size ranges.
• May select samples of materials, using shovel or mechanical sampler.
• May tend control panel to monitor crushing machines that clean anode assemblies and be designated Anode-Assembly Cleaner I.