Hi Jonah,

I agree with Tim, the stock motor is very noisy & ideally better off in another room.
But with the mill in a soundproof box, that should make life a lot easier.

If you're looking at milling Aluminium & Brass on a regular basis, then invest in the Fourth Axis-Proxxon Motor conversion as Tim has already suggested.
I haven't got this particular conversion as yet, but from all accounts it's defiantly the way to go.
The big advantage with this conversion & milling wax is you're then able to use the "one tool" strategy that owners of those bigger mills use.
The stock Roland Motor just doesn't even come close to having enough power to do it.

regards Colin