A facility in which machine tools are used to build and repair parts made of metals and other materials. Machine shops typically use drills, lathes, milling machines, presses, cutting and welding equipment, and grinding and polishing machines to build and repair machine tools, dies, and molds for such mass-produced parts as pistons, screws, or gears. The parts produced by a machine shop can be the end product or can be sold to manufacturers in other industries.