Quote:
Originally posted by bigben2k
If I haven't typed it a zillion times, I never typed it! 
A solid object blocks high frequency noises.
A low-density object blocks low frequency noise.
I suspect that in your case, you want to isolate the 60Hz hum that the motor makes, and that means mounting the whole she-bang on rubber.
You've probably got high freq noise at the gearbox (if you have one) or around the motor, but that should already be wrapped, so if you need to, wrap it again. Aluminium should do, and is easy (relatively) to work with (you just can't get away from that stuff, can you?).
Your other source would be the bit hitting the workpiece, but here you need to see it, and you may even need to get your hands in there, so I'd recoment and Alu frame, with an acrylic top.
Ok, that's the best of the advice I can give you.
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it is a high tourque DC motor which is plenty quite. What is loud is the belt that drives the pully. It screaches quite loudly. And then the endmill actually cutting is the worst part. I need this box to be take-apart-able, light, and easy to move. Metal is out as it doesn't absorb sound. I am thinking about 3/4"Particle board with an acrylic lineing on the inside. It also has to be liquid proof in the inside which is why I say acrylic lining. I need material that absorbs sound and doesn't just echo it like metal does. An aluminum angle frame maybe good.
measurements: 24" wide, 35" long, 30" high. Those are the minumums. that will leave enough room to use the all the hand wheels.
Here is the mill.
http://www.acumotion.com/pro_mill.htm