Having been disappointed with the Harbor Freight rock tumbler, I won this one on auction locally.This is a PAcific Scientific 40T tumbler. I paid $100 for it.
This is clearly a great rock tumbler, however the barrel is kind of big. We (me and kids) do not have as much rocks to tumble. Can we substitute sand for some rocks? What exactly happens if the barrel is mostly empty, would there be no tumbilng action at all? The barrel is hexagonal and not round.i