"Robin S." wrote in message
. ..

As an aside, it's interesting to see the feeds and speeds for aluminum
that
the guys over in AMC are using. 5,000 FPM with diamond cutters.


Robin,

I routinely run cobalt hss tools in 6061 aluminum at appx that
speed.....2-1/2in dia shell mills....at 7500rpms to be exact....

The material removal rates are kinda awesome what with having 15 hp
available at the spindle and feeding it fast enough to peg the meter...

--

SVL