[Behnod]

Dear dudes
I need your help with this issue .
Do 90 degree shoulder cut tools (like APKT holders ) really do 90 cut .
i have recently got a no named cutter that supposed to be 90 but it cuts sth about 84 degree .
what i understand is that because of the axial rake angle there must be a reduction in the diameter that should have been taken into consideration in design .
my question is that is it true or not that it should be exactly 90 .
i was wondering if you could test your branded cutters under your tool presetter and share the result.

[ger21]

A spinning tool can not cut less than 90°. AS it spins, the tip clears out the area under the angle.

[newman55598]

What about if the insert is slightly off making it more like a 60° chamfer mill or 87° like the op stated?

[Behnod]

What about if the insert is slightly off making it more like a 60° chamfer mill or 87° like the op stated?

Yes . i think back of the insert should be slightly off to compensate the angle .

[Behnod]

A spinning tool can not cut less than 90°. AS it spins, the tip clears out the area under the angle.

if the insert is not placed well there would be changes in the angle of slot .

[ger21]

What about if the insert is slightly off making it more like a 60° chamfer mill or 87° like the op stated?

A 60° tool is measured at the tip, not between the side and the bottom. That would make the angle between the side and the bottom greater than 90°.
The angle between bottom and side can be greater than 90, but not less.

[newman55598]

Ok that makes sense. I was thinking about it differently.


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