Quote Originally Posted by Toolmaker51 View Post
We tumble a vibe-bowl full of brass cartridge casings at a time, couldn't be noisier than that.
Hint, 2 cardboard boxes; one a decent bit larger, inverted over the tumbler. Lift one side for air circulation, best if not directed to adjacent wall reflecting the escaping noise. Non scientific testing made it seem the boxes not being centered broke up the sound a bit more. Solid furniture or the floor works better than a library style table too.
sounds like a large workshop, my workshop is just 11' x 7' inside! The tumbler is bolted to the wall - a mistake as it amplifies the vibration, but I have no more room!

Click image for larger version. 

Name:	workshop02.jpg 
Views:	186 
Size:	135.8 KB 
ID:	42884