Quote Originally Posted by Chaz View Post
Typically 12 - 24K. Size of cutter all depends on width and depth of cut.

http://zero-divide.net/?page=fswizard get used to using this, it also tells you how much power you need.

Thanks, looks like small cutters and solid carbide are the way forwards. HP does not really factor until you get up in the 10mm dia range and a 10mm carbide tool is quite spendy. But at that size machine rigidity would be a serious factor so conservatively I would guess that carbide cutters <5mm dia are the order of the day for aluminium.

Good calculator in that link BTW