Originally Posted by WhiteTiger I've used 4 flute cc minis in all 3 diameters, and one thing I've noted is that they have to be specified for aluminum in those itty bitty sizes. Every time I've gotten mixed up and used one with rake and relief angles ground for steel, they do exactly what you describe when cutting aluminum.
That "dust" chip description sure rang a bell 
Might be something else as your specific problem, but my own booboo history has always been wrong rake and relief angles when this sort of thing happens with the minis. |
They're 30-degree helix - not sure what that's intended to cut? Probably not soft brass? Shoot...
Mark