CHIP FORMATION - Mechanical engineering
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Wednesday, December 2, 2009

CHIP FORMATION

There are three types of chips that are commonly produced in cutting,
- discontinuous chips
- continuous chips
- continuous with built up edge

A discontinuous chip comes off as small chunks or particles. When we get this chip it may indicate,

- brittle work material
- small rake angles
- coarse feeds and low speeds

A continuous chip looks like a long ribbon with a smooth shining surface. This chip type may indicate,

- ductile work materials
- large rake angles
- fine feeds and high speeds
- use of coolant and good chip flow

Continuous chips with a built up edge still look like a long ribbon, but the surface is no longer smooth and shining. This type of chip tends to indicate,

- high friction between work and tool causes high temperatures that will occasionally weld the chip to the tool. This will break free, but the effects is a rough cutting action.

Continuous chips, and subsequently continuous cutting action is generally desired.

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