A professional who tends grinding machines that smooth and true bowling balls. Responsibilities include:

• Lifts ball onto work bench.
• Removes excessive molding from ball, using hand power grinder.
• Places ball between abrasive jaws of grinding machine.
• Starts machine and observes grinding operation.
• Stops machine and measures size of ball, using gauge.
• Removes ball from machine at end of grinding and smoothing cycle, and places ball in rack.