A 1-in. hole is to be drilled through a steel plate 1 in. X 6 in. X 10 in. The recommended cutting speed is 80 ftlmin, the feed is 0.020 in./rev, and the unit horsepower is 1.5 hp/in.'/min. a. What is...

A 1-in. hole is to be drilled through a steel plate 1 in. X 6 in. X 10 in. The recommended cutting speed is 80 ftlmin, the feed is 0.020 in./rev, and the unit horsepower is 1.5 hp/in.'/min.

a. What is the cutting time? (12.7 sec)

b. What is the horsepower required at the cutter? (7.2)