The metal working process are broadly classified as Chip less or Non-chip forming processes--> In these process metals are formed under action of heat, pressure, or both. It include forming, drawing, casting, spinning, etc. Chip forming, metal cutting or machining process--> In these processes metal actually cuts & chips are formed. The metal is removed from the work piece with help of wedge shaped tool. The relative motion between tools & work piece is remove the excess material in the form of chips. E.g. Turing, shaping, planning, etc. Classification of metal cutting processes ==> The relative motion between work piece & tool is given by 1] Keeping the work piece stationary & moving the tool (e.g. shaping) 2] By keeping the tool stationary & moving the work (e.g. planning) 3] By moving the tool in relative to one another (e.g. turning ) Proper mechanism are designed & incorporated in the machine control the feeding movement between the tool & work.