A professional who tends machine that sorts metal balls according to size, roundness, or surface defects, such as nicks, scratches, or dents. Respnsibilities include:

• Adjusts settings on control panel, sets graduated opening on gauge slide, or selects and installs gauging screen in barrel of machine through which balls drop into containers according to variation from specified dimensions.
• Loads balls into feed hopper, and starts machine that automatically sorts standard size, oversize, undersize, and defective balls into separate pockets or containers.
• May visually examine or measure sample balls from each container, using micrometer or fixed gauge and label containers, according to quality and quantity of sorted balls.
• May weigh balls on balance scale and record weight and grades on work ticket.