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Manufacturing Engineering
Machining Processes
GATE 2007
Medium

For the same turning operation (147 mm unmachined diameter bar, 630 mm length, feed 0.2 mm/rev), neglecting over-travel or approach of the tool, when tool life is 20 min (cutting velocity ≈97 m/min), the machining time in min for a single pass is

  • A5
  • B10
  • 15
  • D20

Explanation

N=V/(πD)=97,000 mm/min/(π×147mm)≈210.2 rev/min. Machining time=Length/(feed×N)=630/(0.2×210.2)≈15 min.

Source: GATE ME 2007 (2007)

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