Mechanical Engineering > GATE 2014 SET-2 > Machining Time
A hole of 20 mm diameter is to be drilled in a steel block of 40 mm thickness. The drilling is performed at a rotational speed of 400 rpm and feed rate of 0.1 mm/rev. The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minutes) is
Correct : b
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