[HPB]

Hi,
di-boride is as slippery in aluminum as it gets.

You may have noticed that many specialist carbide tools for aluminum are uncoated.

The normal coatings on carbide tools are TiN or TiAlN, both are tri-valent in nature. Guess what....aluminum is a tri-valent metal and
so the aluminum has an 'affinity' with a tri-valent coating. Enter di-boride, a quad-valent (four-valent??.....one-more-than-three-valent??
...two-less-than-hex-valent??) and its 'as greasy as a butchers prick' as my grandmother used to say!

I tend to use flood-cooling. I'm not convinced that the oil is as significant as the flood washing the chips out of the cutzone. Having said that
I have still had Built-Up-Edge in 5083 aluminum with flood cooling. Thats why I tried di-boride...and was impressed.

Craig

Hi Craig,

I thought this thread is in connection with Re: Which bits to use for PCB milling? so newbies don't get the short end of the thread

Cheers,
Hanspeter.