A professional who operates machine to mix or recondition molding sand. Respnsibilities include:

• Weighs out specified amounts of ingredients, such as sand, sea coal, and bonding agents, and shovels them into machine or automatic hopper.
• Sets dials for specified amounts of water, core oil, and other ingredients that are automatically measured and fed into machine.
• Turns dials to time mixing cycle of machine.
• Removes sample of sand and feels sand for consistency.
• Adjusts controls and adds ingredients to vary mixture according to sampling.
• May be designated according to purpose for which sand is to be used as core-sand sand-mill operator; facing-sand sand-mill operator; molding-sand sand-mill operator.