In a chisel the cut progressively increases if ________

This question was previously asked in
ISRO VSSC Technician-B (Fitter) Official Paper (Held On: 14 July 2021)
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  1. Clearance angle is high 
  2. Clearance angle is zero 
  3. Rake angle is high 
  4. Angle of inclination is low  

Answer (Detailed Solution Below)

Option 1 : Clearance angle is high 
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Detailed Solution

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Explanation:

Chisel:

  • The cold chisel is a hand cutting tool used by fitters for chipping and cutting off operations.
  • Chipping is an operation of removing excess metal with the help of a chisel and hammer.
  • Chipped surfaces being rough, they should be finished by filing.

Angles of chisels:
Clearance angle:

  • Clearance angle is the angle between the bottom face of the point and the tangent to the work surface originating at the cutting edge.
  • If the clearance angle is too low or zero, the rake angle increases.
  • The cutting edge cannot penetrate into the work.
  • The chisel will slip.
  • If the clearance angle is too great, the rake angle reduces.
  • The cutting edge digs in and the cut will become deeper and deeper i.e. the cut progressively increases.

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Point angles:

  • The correct point/cutting angle of the chisel depends on the material to be chipped.
  • Sharp angles are given for soft materials, and wide angles for hard materials.
  • The correct point and angle of inclination generate the correct rake and clearance angles.

Rake angle:

  • Rake angle is the angle between the top face of the cutting point, and normal (90°) to the work surface at the cutting edge.
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