A professional who operates previously set up drilling machines, such as single- or multiple-spindle drill presses to drill, ream, countersink, spot face, or tap holes in metal or nonmetal workpieces according to specifications. Respnsibilities include:

• Lifts workpiece manually or with hoist, and positions and secures it on machine table in drilling jig or holding fixture.
• Moves machine controls to feed tools into workpiece, and engages automatic feed.
• Observes machine operation, and verifies conformance of drilled workpiece to specifications, using fixed gauges, calipers, and micrometers.
• Changes worn cutting tools, using wrenches.
• Moves controls to adjust cutting speeds, feed rates, and depth of cut.
• May assist machine setter in setting up machine.
• May sharpen cutting tools, using bench grinder. May perform minor assembly, such as fastening parts with nuts, bolts, and screws, using power tools and handtools.
• May be designated according to product as Barrel Reamer; or function of machine as reamer operator; tapper operator.