遼字石油化工大學⊙ Introduction The purpose of mechanical machining is to turn a kind of raw material into the finished parts that meet the requirement of the produce Under given manufacture conditions, how to apply both an economical and efficient method, as well as a rational process roution, to achieve the desaired parts is the concern of this chapterIntroduction The purpose of mechanical machining is to turn a kind of raw material into the finished parts that meet the requirement of the produce. Under given manufacture conditions, how to apply both an economical and efficient method, as well as a rational process roution, to achieve the desaired parts is the concern of this chapter