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Railways NTPC (Technical Ability) Metal Forming, Casting and Cutting Question Bank Metal Cutting

  • question_answer
    A 400 mm long shaft has 100 mm tapered step at the middle with \[4{}^\circ \] inclined angle. The tailstock offset required to produce this taper on a lathe would be:

    A) 400 sin \[4{}^\circ \]                 

    B) 400 sin \[2{}^\circ \]    

    C) 100 sin \[4{}^\circ \]                 

    D) 100 sin \[2{}^\circ \]    

    Correct Answer: D

    Solution :

    Tailstock offset \[l\,\sin \left( \frac{\theta }{2} \right)=100\sin 2{}^\circ \]


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