Question
Download Solution PDFThe upper part of a chisel (head) is chamfered to an angle of ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- 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.
- Flat chisels: They are used to remove metal from large flat surfaces and chip-off excess metal of welded joints and castings.
- Cross-cut or cape chisels: These are used for cutting keyways, grooves, and slots.
- Half-round nose chisels: They are used for cutting curved grooves (oil grooves).
- Diamond point chisels: These are used for squaring materials at the corners, joints.
- Web chisels/ punching chisels: These chisels are used for separating metals after chain drilling.
- 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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