A professional who operates mills equipped with grinding stones to grind paint or paint ingredients to specified fineness. Respnsibilities include:

• Weighs ingredients, such as pigments and oil on scale and dumps them into feed hopper of mill.
• Starts mill and turns valve to admit steam into mill jacket to heat ingredients.
• Feels or examines mixture to determine fineness of grind.
• Turns screws to set clearance between grinding stones to grind ingredients to specified fineness.
• Opens valve or starts pump to transfer mixture into cooling and storage tanks.
• Cleans millstones, hoppers, and scrapers, using hot water hose, solvent, and brushes.
• Replaces worn grinding stones, using handtools and hoist.