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CNC machining is an overall term utilized for a wide assortment of machining applications. "CNC" is a numerically controlled and programmable feature of a computer, which allows the machine to perform many tasks with minimal human control. CNC machining is the production of components using CNC-controlled machines. The term subtraction describes a range of production processes where the material is extracted from the workpiece or bar to form part of the material component. There are 5 common types of CNC machining that are done by 5 different types of CNC machines.