Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120 . Assuming drill over travel of 2 mm, the time for producing a hole will be

Through holes of 10 mm diameter are to be drilled in a steel plate of

1.	Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120 . Assuming drill over travel of 2 mm, the time for producing a hole will be
A.	4 seconds
B.	25 seconds
C.	100 seconds
D.	110 seconds
Answer» C. 100 seconds

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Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120 . Assuming drill over travel of 2 mm, the time for producing a hole will be

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