Railways Technical Ability Metal Forming, Casting and Cutting Question Bank Metal Cutting

  • question_answer Turning operation, the feed could be doubled to increase the metal removal rate. To keep the same level of surface finish, the nose radius of the tool should be:

    A) Halved             

    B) Kept unchanged

    C) Doubled            

    D) made four times

    Correct Answer: D

    Solution :

    Surface finish \[{{({{R}_{a}})}_{\max }}\frac{{{f}^{2}}}{8r}\] \[\frac{{{r}^{2}}}{{{r}^{1}}}={{\left( \frac{{{f}_{2}}}{{{f}_{1}}} \right)}^{2}}={{2}^{2}}=4\]

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