Re: Large homemade tumblers- anybody seen one?
"Large" is relative, you didn't say how big you want to build; our "large" set is 2 5-gallon barrels on one roller frame. The barrels are 12" P.V.C. pipe a foot long and capped with 5/8" plastic sheet. The fixed end is held down with 12 drywall screws with a truck innertube gasket and sealed with Weld [TM] glue. Good silicone caulking works too. The removable end is attached with 12 1/4" hanger bolts [a fastener with woodscrew threads on one end and machine screw threads on the other], again with a gasket of innertube. I'm against using metal barrels because of the gas producing chemical reactions and incredible noise. I've built several tumblers from 4" dia. to the 12" ones using the same basic method, all have worked very well. I use pipe greater than 3/8" wall thickness to allow bite room for the screws, and use end cap material 1/2" or thicker because of flexing. Should you build your tumblers, I would recommend not going over a foot long, longer gets you reaching in to your elbows in sometimes some really foul smelling goop. The down side to the big tumblers, a loaded barrel weighs 100 pounds, about half that is rock, but they work very well. I'll provide more detail if you wish, hope this helps.
From Larry Larson - February 20, 2010 at 22:55:29