A hole of 25 mm diameter and 62.5 mm depth is to be drilled, the suggested feed is 1.25 mm/rev and the cutting speed is 60 m/min . If the tool approach and tool over travel is 5 mm , the cutting time will be nearly:
A. 0.10 min
B. 0.09 min
C. 0.08 min
D. 0.07 min
Answer:D
A hole of 25 mm diameter and 62.5 mm depth is to be drilled, the suggested feed is 1.25 mm/rev and the cutting speed is 60 m/min . If the tool approach and tool over travel is 5 mm , the cutting time will be nearly:
A. 0.10 min B. 0.09 min C. 0.08 min D. 0.07 min