"Harold and Susan Vordos" wrote in message
...

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...

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SVL


***WOW!***

Very impressive, Sam. The marvels of high speed spindles!


One thing that I forgot to mention is these are roughers--you know, the
'hogger' style shell mills....

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SVL