I've been hand cutting aluminium on a overhead pin router designed for wood but it's quite robust. I found by trail and error that 9000 rpm was the best speed with a twin flute TCT cutter and not wishing to use lube I directed a good jet of compressed air onto the tool which seemed to work well. Feed rate was by hand but it seemed the faster I could push it through the better it cut. Depth of cut of about 0.6mm meant no clogging of the cutter but around 1mm depth it clogged quite regularly.