A professional who supervises and coordinates activities of workers engaged in custom-machining metallic and nonmetallic workpieces to produce, maintain, or repair parts for machines, molds, and equipment, applying knowledge of machine shop procedures, variety of machine-tool setup and operating techniques, metal and plastic properties, and custom-machining methods.

• May supervise workers in related processes, such as forming, welding, inspecting, testing, or assembling.
• Performs duties as described under supervisor master title.