I threw together a direct drive 3 gallon tumbler. Sitting at about 10 degrees with 3 full length baffles to 'walk' the brass forwards.
I'm using a low gear motor that direct drives it at about 70-80 rpm.
It's slow, but works, would it be beneficial to make it go a bit faster by divorcing it and speeding it up, or leave well enough alone?
I plan on building a vibratory tumbler as well, but the motor I wanted to use burned up today