Mechanical Engineering - Workshop Technology - Discussion

I think it should be rectangular.

Octagonal has 8 sides in the chisel.

How is it possible please explain?

Hexa & Octa both available.

Chisels are used to cut the cold metal and are made by forging from cast tool steel of octagonal cross section.

How is it octagonal, can anyone one explain?

The correct answer is rectangular.

The cross-section of a chisel is typically rectangular, with a flat, broad blade and a straight or slightly curved edge. This shape allows for:

- Efficient removal of material.
- Good control and leverage.
- Effective transmission of force to the cutting edge.

Here's why the other options are incorrect:

- Square: A square cross-section would make the chisel prone to twisting and digging in, rather than smoothly removing material.
- Hexagonal: A hexagonal cross-section is not typical for chisels, and would not provide the same level of control and leverage as a rectangular shape.
- Octagonal: An octagonal cross-section is also not typical for chisels, and would likely make the tool more difficult to handle and control.

Rectangular chisels are commonly used for:

- Removing small amounts of material.
- Parrying and shaping wood or metal.
- Scoring and breaking up material.

=> Note that some specialized chisels, like paring chisels or skew chisels, may have slightly different cross-sectional shapes, but rectangular is the most common and versatile shape.

It is made of rectangular Cross section.

Hot chisel cross section is rectangular.

Cold chisel cross section is hexagonal, octagonal.

Which is the correct answer?

Please tell me.

Normally, We use a rectangular cross-section Chisel.

Then What about cold Chisel cross section?