Quote Originally Posted by JAZZCNC View Post
Well in that case I would look long and hard before buying a Mini mill because very few will have the RPM you need for cutting aluminium and soft materials correctly and converting the spindle is not a simple or cheap thing to do.

If you want a challenge you may be better off DIY building a strong Fixed gantry Router/Mill that will do everything you need and then some with the correct spindle fitted. It will certainly be more versatile and useful than a converted Minimill and won't cost much more.
Its amusing that this is where i started - then the thought process led me down the path of buying a machine and converting it :)