Quote Originally Posted by JGS View Post
Any advantage to a vibratory tumbler over the simpler one?
I imagine a rotary tumbler would be too aggressive for this kind of application. From what I've read about rock tumbling, a rotary tumbler will round off the rocks while a vibratory tumbler maintains the same basic shape. If you stuck a blade into a rotary tumbler you might get too much wear on the corners/edges.

But hey, if you have a rotary lying around that'll fit a blade, throw a 'lost cause' in there and report back!