First, in order to ensure that the thread of the guide, processing spindle rotation week, the feed of the tool must be equal to the thread of the guide, the feed is larger; in addition, the strength of the threaded tool is generally poor, so the threaded tooth type is often not once processed, the need for many times for cutting.

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With the continuous progress of science and technology, CNC machining on the complexity of parts, precision and process and other aspects of the more stringent requirements, relying solely on manual programming has been difficult to meet these needs. Because of this, CAM (computer-aided manufacturing) software was born and gradually popularised.