Machining is a process to carve any raw material into a desired final shape and size by a controlled material-removal tools. The processes  of controlled material removal, are collectively known as subtraction manufacturing, in distinction from processes of controlled material addition, which are known as additive manufacturing. The “controlled” part may vary with the use of machine tools (in addition to just power tools and hand tools).

Traditional machining processes, such as turning, boring, drilling, milling, broaching, sawing, shaping, planing, reaming, and tapping. In these “traditional” or “conventional” machining processes, machine tools, such as lathes, milling machines, drill presses, or others, are used with a sharp cutting tool to remove material to achieve a desired geometry.

Machining is integral part in fabrication of metal products, but it can also be used on materials such as wood, plastic, ceramic, and composites. A person who specializes in machining is called a machinist. A room, building, or company where machining is done is called a machine shop. Much of modern-day machining is carried out by computer numerical control (CNC), in which computers are used to control the movement and operation of the mills, lathes, and other cutting machines.

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