[hartcreek]

First off there is no such thing as centrafugal force. The word you are lookin for is centripital force. Second commercail tumblers are already calibrated to work right. I could easily pick up the Thumbler from my niece and shoot a video of the brass tumbling inside the Thumbler smooth drum as the clear lense that I mad is sitting on my loading bench.

Sliding will occur if you overload the drum.

A centrafuge is a tool that uses centripital force to seperate things such as the components of blood.