A professional who tends machine that grinds and blends coke according to specifications. Respnsibilities include:

• Sets mill gauge to specified fineness of grind.
• Starts conveyors and screening and grinding equipment.
• Moves gate levers to regulate flow of raw coke into machine, and processed coke to mixer or packing-material hopper.
• Turns valve to regulate moisture content of material.
• Opens gauge valves to fill buckets under hopper spouts, attaches crane cable to buckets, and signals rigger to remove them.
• Weighs materials at specified intervals, using platform scales, and records data.
• Observes operation to ensure continuity of flow and to detect malfunctioning.
• May tend machine that mixes materials for electrodes.