(a) describe the advantages and application of having a hollow spindle in the head stock and tail-stock of a lathe. (b) describe the difficulties that may be encountered in clamping a non-cylindrical workpiece on a three-jaw chuck. what recommendations will you give for proper clamping of such part. (c) what is the function of the feed rod and lead screw in a lathe. prob. 5: why is end milling such an important versatile process? (b) what are the advantages of helical teeth over straight teeth on cutters for slab milling? (c) describe the procedure to cut a gear blank using a form cutter, and why do machined gears have to be subjected to finishing operations?