In a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plate of 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is 118 , Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is

In a single pass drilling operation, a through hole of 15 mm diameter

1.	In a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plate of 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is 118 , Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is
A.	35.1
B.	32.4
C.	31.2
D.	30,1
Answer» B. 32.4

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In a single pass drilling operation, a through hole of 15 mm diameter is to be drilled in a steel plate of 50 mm thickness. Drill spindle speed is 500 rpm, feed is 0.2 mm/rev and drill point angle is 118 , Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is

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