A professional who sets up and operates variety of machine tools, and fits and assembles parts to fabricate or repair machine tools and maintain industrial machines, applying knowledge of mechanics, shop mathematics, metal properties, layout, and machining procedures. Respnsibilities include:

• Observes and listens to operating machines or equipment to diagnose machine malfunction and determine need for adjustment or repair.
• Studies blueprints, sketches, machine parts or specifications to determine type and dimensions of metal stock required.
• Measures, marks, and scribes dimensions and reference points on metal stock surfaces, using such measuring and marking devices as calibrated ruler, micrometer, caliper, and scriber.
• Dismantles machine or equipment, using handtools or power tools, to examine parts for defect or to remove defective part.
• Replaces defective part with new part or repairs or reproduces part from various kinds of metal stock, using handtools, such as scraper, file, and drill, and machine tools, such as lathe, milling machine, shaper, borer, and grinder.
• Assembles and test operates machine to verify correction of malfunction.
• Maintains and lubricates machine tools and equipment.
• May weld parts, using arc or gas welding equipment.
• May repair or replace faulty wiring, switches, or relays.