In a single pass drilling operation, a through hole of 15mm diameter is to be drilled in a steel plate of 50mm thickness. Drill spindle speed is 500rpm, feed is 0.2mm/rev and drill point angle is 1180. Assuming 2mm clearance at approach and exit, the total drill time in seconds is (A) 35.1 (B) 32.4 (C) 31.2 (D) 30.1
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according to Me option c is correct
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According to me A will be correct I think
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