CNC machining is a broad parts manufacturing category that includes many different computer-controlled processes where raw material is selectively removed in exact amounts to produce a near-final shape of parts. That’s why it’s considered subtractive, as opposed to additive manufacturing or 3D printing. Standard CNC machining processes include CNC milling, CNC turning, surface grinding, and electrical discharge machining (EDM) although there are other specialized applications. Whenever a machine is digitally controlled there must always be a 3D CAD file of the part design which is used to program the machine’s movements.
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