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Chipbreakers

10/10/2018

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Picture
​The typical reason for grinding chip breakers into a carbide endmill are, as their name suggests, to break up long chips. However there is also an impact on the system's dynamics or it's tool point behavior.

If a dynamic measurement (tap-test) reveals a maximum stable depth of cut of 1" and the chip breakers remove 30% of the surface area of the cutting edges, then the cutting forces are reduced by 30%, deflection is reduced and the tool will be able to cut deeper than as measured (probably faster too, but you would have to measure its frequency to know by how much). 

If you are having stability issues when using a long axial depth of cut with trochoidal style tool paths, consider adding chip breakers. 
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