I am thinking about building a mpcnc but I don’t know much about cnc machines. I want a versatile machine, one that can easily handle aluminum (I would assume that it would then also do fine on other, softer, materials (wood, plastic, carbon fiber)). I would like something that is fairly quiet and also below $150 (including power supply and any controller).
So my question is what spindle or router should I get?
Do I need to be able to control the rpm with software, just use something like a potentiometer (like some spindles off ebay), or does it not need variable speed at all?