Angle of centre punch is

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ISRO SAC Technician B Fitter 6 Nov 2016 Official Paper
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  1. 45°
  2. 30°
  3. 60°
  4. 90°

Answer (Detailed Solution Below)

Option 4 : 90°
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Detailed Solution

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Explanation:

Punches:

  • Punches are used in order to make certain dimensional features of the layout permanent.
  • There are three types of punches. They are:
    1. Centre punch
    2. Prick punch
    3. Dot punch

Centre punch:

  • The angle of the point is 90° in a centre punch.
  • The punch mark made by this is wide and not very deep.
  • This punch is used for locating holes.
  • The wide punch mark gives good seating for starting the drill.

Prick punch:

  • The angle of the prick punch is 30°.
  • This punch is used for making light punch marks needed to position dividers and trammels.
  • The divider leg will get proper seating in the punch mark.
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