Machinists use machine tools, such as lathes, milling machines, and grinders, to produce precision metal parts. Many machinists must be able to use both manual and CNC machinery. CNC machines control the cutting tool speed and do all necessary cuts to create a part. The machinist determines the cutting path, the speed of the cut, and the feed rate by programming instructions into the CNC machine. Although workers may produce large quantities of one part, precision machinists often produce small batches or one-of-a-kind items. The parts that machinists make range from simple steel bolts to titanium bone screws for orthopedic implants. Hydraulic parts, antilock brakes, and automobile pistons are other widely known products that machinists make.

Machinists and tool and dye makers typically do the following:

• Read blueprints, sketches, or computer-aided design (CAD) and computer-aided manufacturing (CAM) files
• Set up, operate, and disassemble conventional, manual, automatic, and CNC machine tools
• Align, secure, and adjust cutting tools and workpieces—monitor the feed and speed of machines
• Turn, mill, drill, shape, and grind machine parts to specifications—file, grind, and adjust parts so that they fit together properly
• Measure, examine, and test completed products for defects—test completed tools and dies to ensure that they meet specifications
• Smooth and polish the surfaces of parts or products, tools and dies—present finished workpieces to customers and make modifications if needed
• Compute and verify dimensions, sizes, shapes, and tolerances of work pieces

Some machinists repair or make new parts for existing machinery. After an industrial machinery mechanic discovers a broken part in a machine, a machinist remanufactures the part. The machinist refers to blueprints and performs the same machining operations that were used to create the original part in order to create the replacement. Some manufacturing processes use lasers, water jets, and electrified wires to cut the workpiece. As engineers design and build new types of machine tools, machinists must learn new machining properties and techniques.

Tool and die makers construct precision tools or metal forms, called dies, that are used to cut, shape, and form metal and other materials. They produce jigs and fixtures—devices that hold metal while it is bored, stamped, or drilled—and gauges and other measuring devices. Dies are used to shape metal in stamping and forging operations. They also make metal molds for die casting and for molding plastics, ceramics, and composite materials.

Tool and die makers use CAD to develop products and parts. They enter designs into computer programs that produce blueprints for the required tools and dies. Computer numeric control programmers, described in the metal and plastic machine workers profile, convert CAD designs into CAM programs that contain instructions for a sequence of cutting-tool operations. Once these programs are developed, CNC machines follow the set of instructions contained in the program to produce the part. Machinists normally operate CNC machines, but tool and die makers often are trained to both operate CNC machines and write CNC programs and thus may do either task.

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There are multiple ways for workers to gain competency in the job as a machinist or tool or die maker. One common way is through long-term, on-the-job training, which lasts 1 year or longer.

Trainees usually work 40 hours per week and take additional technical instruction during evenings. Trainees often begin as machine operators and gradually take on more difficult assignments. Machinists and tool and die makers must be experienced in using computers to work with CAD/CAM technology, CNC machine tools, and computerized measuring machines. Some machinists become tool and die makers.

Some new workers may enter apprenticeship programs, which are typically sponsored by a manufacturer. Apprenticeship programs often consist of paid shop training and related technical instruction lasting several years. The technical instruction usually is provided in cooperation with local community colleges and vocational–technical schools. Workers typically enter into apprenticeships with a high school diploma or equivalent.

Analytical skills. Machinists and tool and die makers must understand technical blueprints, models, and specifications so that they can craft precision tools and metal parts.
Manual dexterity. Machinists’ and tool and die makers’ work must be accurate. For example, machining parts may demand accuracy to within .0001 of an inch, a level of accuracy that requires workers’ concentration and dexterity.
Math skills and computer-application experience. Workers must be experienced in using computers to work with CAD/CAM technology, CNC machine tools, and computerized measuring machines.
Mechanical skills. Machinists and tool and die makers must operate milling machines, lathes, grinders, laser and water cutting machines, wire electrical discharge machines, and other machine tools.
Physical stamina. Machinist and tool and die makers must stand for extended periods and perform repetitious movements.
Technical skills. Machinists and tool and die makers must understand computerized measuring machines and metalworking processes, such as stock removal, chip control, and heat treating and plating.

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