Quote Originally Posted by Neale View Post
And I wouldn't worry about going for the smaller spindle. I doubt that many home-built machines can fully load the bigger spindle and the main reason for choosing the larger size is they usually take ER20 collets which allow up to 1/2" cutter shanks.

I've got a 2.2kw WC spindle coming for a new build, what size cutter could these handle in aluminium??

I have read that torque drops badly at lower speeds but what is the usable range???