Hi, it the first time I post on this forum but I found some solutions to my problems in the past thanks to everyone sharing their experience.


We recently acquiered an high speed air-turbine spindle that runs at 150 000 RPM. I'm trying to mill with our Hurco 3-axis with a 1/32'' dia(0.031'') ball nose tool :

Harvey Tool - Miniature Ball End Mills | Carbide, 2 Flute, 45° Helix

I'm machining in aluminum 6061-T6 and so I took the TiB2 coating.

My problem:

I keep breaking the tool. I've been using the company feeds and depths but it seems to me that it's going too fast and too deep.


I need help. I think that if I go too slow, the tool will heat up and will not cut.
I've noticed that conventional milling does not cut at all, it melts the metal.
Also, I'm not using any coolant.

Thanks