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Machining mainly has two main categories, manual machining and numerical control machining. Manual machining refers to the method of machining various materials by manual manipulation of mechanical equipment such as milling machines, laths, drilling machines, and sawmills by machining workers. Manual machining is suitable for small volume, simple part production. Numerical control machining (CNC) refers to the use of machining workers to perform machining with numerical control equipment, which includes machining centers, mill milling centers, electrical spark line cutting equipment, thread cutting machines, etc. the vast majority of machining workshops use NC machining technology, which is programmed to place the workpiece in a Cartesian coordinate system (x, y, z) converted into program language, the CNC controller for CNC machines automatically removes materials as required to derive machined workpieces by identifying and interpreting the program language to control the axis of CNC machines to automatically process the workpieces in a continuous manner for large, complex shaped parts.

CAD / cam may be used in machining workshops (computer aided design computer aided manufacturing) system to automatically program CNC machines. The geometry of the parts is automatically converted from a CAD system to a cam system, and the mechanical worker selects various machining methods on a virtual display display. When the mechanical worker has selected a certain machining method, the CAD / CAM system can automatically output the CNC code, usually referring to the G code, and enter the code into the NC machine Controller of the bed for practical machining operations.

Equipment on the rear of the plant, such as metal cutting machines (including the equipment such as cars, mills, planing, and insertion), needs to be repaired if the parts of the equipment required for production are bad, so that it needs to be sent to the machining shop for repair or processing.