Aluminium and other soft metals have had some success with some coolants and the correct cutting tool. I will followup once I check with my brothers (both are General Machinists and work with these soft metals day in and day out making spot welding equipment for the automotive sector). I don't think that an 1/8 inch depth of cut is that bad, even though it is a slut cut. As was said there are calculations based on the material for every part from machine power (HP/Watts) needed, rpm to run the cutter, the feed rate and depth of cut. And each piece of the puzzle affects the next. I have all those formulas in a box from my college days. I haven't used them personally because I don't work in that field but will see what I can find.