6. A drilling operation is to be performed with a 25.4 mm diameter twist drill in a steel workpart. The hole is a blind-hole at a depth = 50 mm, and the point angle = 118°. Cutting conditions are: speed = 25 m/min, feed 0.25 mm/rev. Determine: (a) the cutting time to complete the drilling operation, (b) metal removal rate during the operation, after the drill bit reaches full diameter.