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A hole of 20 mmdiameter is to be drilled in asteel block of 40 mmthickness. The drilling isperformed at rotational speedof 400 rpm and feed rate of 0.1mm/rev. The requiredapproach and over run of thedrill together is equal to theradius of drill. The drillingtime (in minute) is

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A hole of 20 mmdiameter is to be drilled in asteel block of 40 mmthickness. The drilling isperformed at rotational speedof 400 rpm and feed rate of 0.1mm/rev. The requiredapproach and over run of thedrill together is equal to theradius of drill. The drillingtime (in minute) is






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