Multiple choice

Uncut thickness = 0.5 mm, Cutting speed = 20 m/min, Width of cut = 5 mm, Chip thickness = 0.7 mm Thrust force = 200 N, Cutting force = 1200 N, Rake angle = 15� Assume Merchant's theory.

The percentage of total energy dissipated due to friction at the tool-chip interface is

  1. 30%

  2. 42%

  3. 58%

  4. 70%

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A Correct answer
Explanation