Multiple choice

Cutting tool is much harder than the workpiece. Yet the tool wears out during the tool-work interaction, because

  1. extra hardness is imparted to the workpiece due to coolant used

  2. oxide layers on the workpiece surface impart extra hardness to it

  3. extra hardness is imparted to the workpiece due to severe rate of strain

  4. vibration is induced in the machine tool
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tool wears out during the tool-work interaction because extra hardness is imported to the workpiece due to severe rate of strain on the tool tip.

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