Apply theory and principles of mechanical engineering to modify, develop, test, or calibrate machinery and equipment under direction of engineering staff or physical scientists.

Apply engineering theory and principles to problems of industrial layout or manufacturing production, usually under the direction of engineering staff. They perform time and motion studies on worker operations in a variety of industries for purposes such as establishing standard production rates or improving efficiency.

Apply theory and principles of environmental engineering to modify, test, and operate equipment and devices used in the prevention, control, and remediation of environmental problems, including waste treatment and site remediation, under the direction of engineering staff or scientist. They assist in the development of environmental remediation devices.

Build, install, test, or maintain robotic equipment or related automated production systems.

Operate, test, maintain, or calibrate unmanned, automated, servo mechanical, or electromechanical equipment. They operate unmanned submarines, aircraft, or other equipment at worksites, such as oil rigs, deep ocean exploration, or hazardous waste removal. They assist engineers in testing and designing robotics equipment.

Test or modify developmental or operational electrical machinery or electrical control equipment and circuitry in industrial or commercial plants or laboratories. They usually work under direction of engineers or technologists.

Lay out, build, test, troubleshoot, repair, and modify developmental and production electronic components, parts, equipment, and systems, such as computer equipment, missile control instrumentation, electron tubes, test equipment, and machine tool numerical controls, applying principles and theories of electronics, electrical circuitry, engineering mathematics and physics.

Apply theory and principles of civil engineering in planning, designing, and overseeing construction and maintenance of structures and facilities under the direction of engineering staff or physical scientists.

Operate, install, calibrate, and maintain integrated computer or communications systems, consoles, simulators, and other data acquisition, test, and measurement instruments and equipment, which are used to launch, track, position, and evaluate air and space vehicles. They record and interpret test data.

Prepare detailed working diagrams of machinery and mechanical devices, including dimensions, fastening methods, and other engineering information.