vibratory

Some years ago - when my wife and I were trying to raise a family and live on just my salary as a law enforcement officer, I built my own case tumbler. :) I used the drive mechanism from a Texas Instruments Commercial Dot Matrix printer I got for free, a couple of material positioning rollers...

For case tumbling, we seem to mostly talk about steel pins, corn cobs and walnut shells. There have been the occasional post of someone using rice or mica, its mostly the "big three". Does anyone have any experience tumbling brass in other media? Sand. Silicon dioxide. Vermiculite. If so...