Multiple choice

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 1180. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is

  1. 35.1

  2. 32.4

  3. 31.2

  4. 30.1
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