A professional who tends machine that twists metal bars, squares, and blades to specified shape. Respnsibilities include:

• Clamps end of workpiece into stationary holding fixture.
• Slides carriage, lowers table, or raises spindle to adjust to length of workpiece and clamps other end of workpiece into chuck or fixture of drive spindle.
• Starts machine to rotate drive spindle and stops machine after specified number of turns or sets limit switch to stop machine.
• May install special fixtures and chuck to twist together two or more pieces.
• Examines finished work for conformance to specifications.
• May clamp end of workpiece in vise, slide pipe over workpiece to prevent longitudinal warping, and twist workpiece, using pipe wrench or twisting fork.