This article has recommended some basic theories of high–speed cutting and cutting force at first, it is that the work obstrution of material resists the cutter to cutting force. It is an important factor which influences systematic intensity of the craft , rigidity , and the quality of processed workpiece .It is main basis of designing of lathe , cutter , jig and calculation of power consume. At present during the course of automatic produce and accurate processing , it is used to examine processing surface quality , machining accuracy and degree of cutter wearing.
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