"Jim Stewart" wrote in message
.. .
I'd like to add an indexable face mill, preferably
6" diameter to my mill tooling. Will an R8 spindle
handle that diameter without excessive flexing
and chatter?

You've got two chances, slim and none. I got one this size for my NMTB40 4
hp. Excello and I can only do very light cuts. This machine just LOVES a 3"
sandvick R390 face mill. Make PILES o' chips fast. Inserts do make a huge
diference on the large diameter face mills.

karl