From watching youtube videos with wooden CNC machines, I think this machine IS capable of cutting aluminum blocks except without the cooling fluid of course, but I think you can attach a compressor hose and handle in place of a fluid hose and have it blow wherever you cut to keep the tiny particles out of the way and also offer some cooling.
As for the power of these motors and unipolar goes, well if I remember correctly, I read somewhere that Chirs or Taylor said the toolbit will break or the dremel tool with stop spinning far before the 305oz-in stepper motors begin losing steps/stall so therefor I think the 305oz-in stepper motors would have well more than enough power to cut aluminum but correct me if I am wrong.
