The upper part of a chisel (head) is chamfered to an angle of ______.

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ALP CBT 2 Fitter Official Paper: Held on 21 Jan 2019 Shift 2
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  1. 10° to 12° 
  2. 28° to 32°
  3. 18° to 22°
  4. 38° to 42°

Answer (Detailed Solution Below)

Option 1 : 10° to 12° 
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Explanation:

  • 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.
  • Chisels are made from high carbon steel or chrome vanadium steel.
  • There are five common types of chisels.
  1. Flat chisels: They are used to remove metal from large flat surfaces and chip-off excess metal of welded joints and castings.
  2. Cross-cut or cape chisels: These are used for cutting keyways, grooves, and slots.
  3. Half-round nose chisels: They are used for cutting curved grooves (oil grooves).
  4. Diamond point chisels: These are used for squaring materials at the corners, joints.
  5. Web chisels/ punching chisels: These chisels are used for separating metals after chain drilling.

Fitter 29 4

F3 Vinanti Engineering 25.08.23 D1

  • The upper part of a chisel is chamfered to an angle of 10° to 12° 
  • The correct point angle and angle of inclination for different materials for chipping is given in below Table
Material to be cut  Point Angle Angle of inclination
High Carbon Steel 65°  39.5°
Cast iron 60°  37°
Mild steel 55°  34.5°
Brass 50°  32°
Copper 45°  29.5°
Aluminum 30°  22° 
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