A fitter puts together or installs machinery, engines, diesel engines, or other equipment used at a power plant, manufacturing facility, oil and gas plant, or in mining operations. Some fitters may work onsite, while others work at automotive repair facilities for construction equipment. As a fitter, your duties include setting up and providing maintenance for all the machine parts. Depending on the industry, you may need specific occupational skills, as fitters often have responsibilities involving welding or the use of tools like hydraulic presses, grinders, and milling machines. Your day may also include inspecting equipment or answering calls to calibrate or repair machinery.