Manufacturing Processes II · Machining · 2 marks · Numerical answer
A cast-iron blind hole is bored to25 mm diameter and100 mm depth in one pass. Cutting speed100 m/min, feed0.1 mm/rev and approach allowance2 mm. Find machining time in minutes (two decimals).
Spindle speed N=100000/(π25)=1273.24 rpm. Axial feed rate=fN=127.324 mm/min, and travel length=100+2=102 mm. Time=102/127.324=0.8011 min, or0.80. The approach distance must be included.
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