1) Write a critical note on the drive system used with machine tools. Specify their relative merits and demerits. Explain the coordinate systems of NC machine tools with a neat sketch. Explain the construction and the operating steps of automatic tool changer. a) Write a note on slide positioning system. b) Explain the principle of optical grating. Write a critical note on principle of working of pneumatic, hydraulic and electro-mechanical systems for position control. a) Write a note on punched tape. b) Write a note on NC part programming. Write a critical note on compute automated part programming.