A 1-in. hole is to be drilled through a cast iron block 6 in. X 4 in. X 1 in. The recommended cutting speed is 150 ftlmin, the unit horsepower is 1.2 hp/h3/rnin, the feed is 0.02 in./rev, and the...

A 1-in. hole is to be drilled through a cast iron block 6 in. X 4 in. X 1 in. The recommended cutting speed is 150 ftlmin, the unit horsepower is 1.2 hp/h3/rnin, the feed is 0.02 in./rev, and the drill has the standard angle of 118".

a. What is the RPM? (573)

b. What is the metal removal rate? (9 in.'/min)

c. What is the horsepower required at the cutter? (10.8 hp)

d. What is the normal time to drill the hole? (0.1 13 min)