遼字石油化工大學⊙ Instructional objectives At the end of this lesson the student would be able to (1)Understand the process of product and the process of part, master the composition of the process of product (2 )Understand the content and steps of the machining process planning and focus on the main problems to be solved when formulating the machining process planning (3 )Understand machining metal removel and its influencing factors master the determination of process size and tolerance (4)Understand the definition and characteristics of dimensional chains master its composition and the basic calculation formula of it. master the analysis and calculation of dimensional chains with emphasisInstructional objectives At the end of this lesson, the student would be able to : (1) Understand the process of product and the process of part, master the composition of the process of product. (2) Understand the content and steps of the machining process planning, and focus on the main problems to be solved when formulating the machining process planning. (3) Understand machining metal removel and its influencing factors, master the determination of process size and tolerance. (4) Understand the definition and characteristics of dimensional chains, master its composition and the basic calculation formula of it. Master the analysis and calculation of dimensional chains with emphasis