A professional who sets up and operates multiaxis numerical-control milling machine to mill surfaces of metallic and nonmetallic workpieces according to specifications and tooling instructions, applying knowledge of machining methods. Respnsibilities include:

• Threads perforated or magnetic tape through read-head in control console, or enters commands into control panel, to retrieve preprogrammed machine data from mainframe computer.
• Inserts precision indicator in machine spindle, and depresses switches to jog spindle into contact with workpiece, synchronize tape and tool, and record setup point.
• Retracts spindle and loads and secures first preset tool and holder.
• Starts machine and observes cutting operation.
• Compares numerical data display with specifications on operations sheet.
• Assembles and presets tooling for next operation during automated cycle to reduce machine downtime.
• Replaces milling tools with drilling and boring tools at specified change points to reduce or eliminate subsequent machining of workpiece on another machine.
• May operate machine on preliminary dry run before machining first part to detect errors in tape or computer program.
• May be designated according to make, trademark, or configuration of machine, characteristics of control system, or type of product as contour-path tape-mill operator; planer-type milling-machine operator, numerical control; profile-mill operator, tape control; tape control skin-or-spar-mill operator; tape keller operator.