Question
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
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
Answer: Option A
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