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Discussion :: Manufacturing and Production Technology

  1. The point angle of a drill, for drilling stainless steel, is

    2. A.

     90°
    B.

     118°
    C.

     135°
    D.

     150°

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    Workspace

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    Answer : Option C

    Explanation :

    The point angle is located at the head of the twist drill. For hard materials such as stainless steel, the point angle should be large and e.g. 130° or 135°. For soft materials, point angles of e.g. 118° are used. With a large point angle, more of the cutting edge engages in the workpiece when drilling

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