Machine Repairer Apprenticeship

Did you know?*

* Information retrieved from the U.S. Bureau of Labor Statistics.

What Does a Machine Repairer Do?

Machine Repairers are highly skilled individuals who use machine tools, such as lathes, milling machines, and machining centers, to produce precision machined parts. Precision Machine Repairers produce small batches or one-of-a-kind items. They use their knowledge of the working properties of materials and their skill with machine tools to plan and carry out the operation needed to make a variety of products that meet precise specifications.

Along with operating machines that use cutting tools to shape work pieces, Machine Repairers also utilize machines that cut with lasers, water jets, or electrified wires. While some of the computer controls may be similar, Machine Repairers must understand the unique cutting properties of these different machines. As engineers create new types of machine tools and new materials to machine, Machine Repairers must constantly learn new machining properties and techniques.


Before they machine a part, Machine Repairers must carefully plan and prepare the operation. These workers first review electronic or written blueprints or specifications for a job. Next, they calculate where to cut or bore into the workpiece (the piece of steel, aluminum, titanium, plastic, silicon or any other material that is being shaped), how fast to feed the workpiece into the machine, and how much material to remove. They then select tools and materials for the job, plan the sequence of cutting and finishing operations, and mark the workpiece to show where cuts should be made.

After this layout work is completed, Machine Repairers perform the necessary machining operations. They position the workpiece on the machine tool�drill press, lathe, milling machine, or other type of machine�set the controls, and make the cuts. During the machining process, they must constantly monitor the feed rate and speed of the machine. Machine Repairers also ensure that the workpiece is being properly lubricated and cooled, because the machining of metal products generates a significant amount of heat. The temperature of the workpiece is a key concern because most metals expand when heated; Machine Repairers must adjust the size of their cuts relative to the temperature. Some rare but increasingly popular metals, such as titanium, are machined at extremely high temperatures.

Machine Repairers detect some problems by listening for specific sounds�for example, a dull cutting tool or excessive vibration. Dull cutting tools are removed and replaced. Cutting speeds are adjusted to compensate for harmonic vibrations, which can decrease the accuracy of cuts, particularly on newer high-speed spindles and lathes. After the work is completed, Machine Repairers use both simple and highly sophisticated measuring tools to check the accuracy of their work against blueprints.

Many modern machine tools are computer numerically controlled (CNC). CNC machines, following a computer program, control the cutting tool speed, change dull tools, and perform all of the necessary cuts to create a part. Frequently, Machine Repairers work with computer control programmers to determine how the automated equipment will cut a part. The programmer may determine the path of the cut, while the Machine Repairer determines the type of cutting tool, the speed of the cutting tool, and the feed rate.

Because most Machine Repairers train in CNC programming, they may write basic programs themselves and often set offsets (modify programs) in response to problems encountered during test runs. After the production process is designed, relatively simple and repetitive operations normally are performed by machine setters, operators, and tenders. 

Some manufacturing techniques employ automated parts loaders, automatic tool changers, and computer controls, allowing machine tools to operate without anyone present. One production Machine Repairer, working 8 hours a day, might monitor equipment, replace worn cutting tools, check the accuracy of parts being produced, adjust offsets, and perform other tasks on several CNC machines that operate 24 hours a day (lights-out manufacturing). During lights-out manufacturing, a factory may need only a few Machine Repairers to monitor the entire factory.

Other Machine Repairers do maintenance work�repairing or making new parts for existing machinery. To repair a broken part, maintenance Machine Repairers may refer to blueprints and perform the same machining operations that were needed to create the original part. Because the technology of machining is changing rapidly, Machine Repairers must learn to operate a wide range of machines.

What Are the Working Conditions?

Today, most machine shops are relatively clean, well lit, and ventilated. Many computer-controlled machines are partially or totally enclosed, minimizing the exposure of workers to noise, debris, and the lubricants used to cool work pieces during machining. Nevertheless, working around machine tools presents certain dangers and workers must follow safety precautions. Machine Repairers wear protective equipment, such as safety glasses to shield against bits of flying metal and earplugs to dampen machinery noise. They also must exercise caution when handling hazardous coolants and lubricants, although many common water-based lubricants present little hazard. The job requires stamina, because Machine Repairers stand most of the day and, at times, may need to lift moderately heavy work pieces. Modern factories extensively employ autoloaders and overhead cranes, reducing heavy lifting.

Machine Repairers work a 40-hour week. Evening and weekend shifts are becoming less common as companies justify investments in more expensive machinery to extend hours of operation. This trend is increasing the use of automation and lights-out manufacturing for less desirable shifts. Overtime is common during peak production periods.

Knowledge & Training

Machine Repairers train in apprenticeship programs, informally on the job, and in technical colleges. Experience with machine tools is helpful. In fact, many entrants previously have worked as machine setters, operators, or tenders. Persons interested in becoming Machine Repairers should be mechanically inclined, have good problem-solving abilities, be able to work independently, and be able to do highly accurate work (tolerances may reach 1/10,000th of an inch) that requires concentration and physical effort. High school or vocational school courses in mathematics (especially trigonometry), blueprint reading, metalworking, and drafting are highly recommended.

Apprenticeship programs consist of shop training and related classroom instruction lasting up to 4 years. In shop training, apprentices work almost full time, and are supervised by an experienced Machine Repairer while learning to operate various machine tools. Classroom instruction includes math, physics, materials science, blueprint reading, mechanical drawing, and quality and safety practices. In addition, as machine shops have increased their use of computer-controlled equipment, training in the operation and programming of CNC machine tools has become essential. Apprenticeship classes are often taught in cooperation with local community or vocational colleges. A growing number of Machine Repairers learn the trade through 2-year associate degree programs at community or technical colleges. Graduates of these programs still need significant on-the-job experience before they are fully qualified.

To boost the skill level of Machine Repairers and to create a more uniform standard of competency, a number of training facilities and colleges are implementing curriculums that incorporate national skills standards developed by the National Institute of Metalworking Skills (NIMS). After completing such a curriculum and passing a performance requirement and written exam, trainees are granted a NIMS credential, which provides formal recognition of competency in a metalworking field. Completing a recognized certification program provides a Machine Repairer with better career opportunities.

What Does the Training Require?

What are the Application Requirements?

What Skills Should I Possess?

Who Should I Contact In My Area?


Your County: Your BAS Representative:
Outagamie, Waupaca Lisa Perkofski
Forest, Langlade, Lincoln, Marathon, Oneida, Portage, Vilas, Wood Ben Stahlecker


Your County: Your BAS Representative:
Ashland, Barron, Bayfield, Burnett, Chippewa, Clark, Douglas, Dunn, Eau Claire, Iron, Pepin, Pierce, Polk, Rusk, Sawyer, St. Croix, Washburn Rob Ecker
Adams, Price, Taylor Ben Stahlecker


Your County: Your BAS Representative:
Brown, Door, Florence, Kewaunee, Marinette, Menominee, Oconto, Outagamie, Shawano Burt Harding
Waushara, Winnebago Lisa Perkofski
Columbia, Green Lake, Jefferson, Marquette, Sauk Debbie Schanke
Dane, Rock Tracy Jallah
Kenosha, Racine, Walworth Tim Ziffer
Waukesha Joshua Johnson
Hafeezah Ahmad
Milwaukee Bob Scheldroup
Hafeezah Ahmad
Calumet, Fond du Lac, Manitowoc, Sheboygan Sandra Destree
Dodge, Ozaukee, Washington Liz Pusch


Your County: Your BAS Representative:
Green Tracy Jallah
Sauk Debbie Schanke
Buffalo, Crawford, Grant, Iowa, Jackson, Juneau, La Crosse, Lafayette, Monroe, Richland, Trempeleau, Vernon Kathy O'Sullivan

Additional Resources

The United States Bureau of Labor Statistics maintains information on all occupations. For more information on the Machine Repairer trade in the United States, visit: Repairers-and-tool-and-die-makers.htm

Sources: Bureau of Apprenticeship Standards Position Descriptions,
Apprenticeship in Wisconsin Handbook

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