It is required to turn a 100 mm. diameter and 300 mm. length bar to the shown dimension with speed = 60 m/min, feed rate = 0.6 mm/rev and depth of cut = 4mm for rough machining and speed = 90 m/min, feed rate = 0.1 mm/rev depth of cut = 1 mm for finish machining. The approach and over travel = 3 mm. 

1. Choose the suitable method to hold this workpiece. 

2. Find the machining time required to machine this workpiece.   

All dimensions in mm. -100- -50- -100 80- -080-