Rock Tumbler baffle

A bolt in baffle to make a jar, paint can or tin into a rock tumbler or media tumbler. It prevents the items from sliding around and forces them to tumble properly. Very sturdy. prints without support.


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I think the hardware is 3/8th inch. A 1/2 inch wrench fits the nuts and bolt head. Could be 5/16? Assemble it by trapping one nut in the baffle with the nut trap, thread a second nut onto the bolt and thread that into the trapped nut. Then expand it in the container till tight and lock it in place with the second nut. You can get a wrench on it but you will have to flip the wrench repeatedly to get a grip on the bolt end because of it being in a jar. There is a slightly taller version of the file for a larger container. This is part of my wind powered rock tumbler design but is useful in it's own right for other tumblers. Use a cut up piece of 100 grit sand paper and some water for the rough polish and 1000 grit with water for the fine finish. Don't bother buying those expensive bags of grit available for tumblers. I've included the Sketchup files so you can adjust the design for your container using the Push/Pull Sketchup tool.

Materials and methods

-A container roughly 44 mm in radius.
-2 nuts and one bolt that fit a half inch wrench
-100 grit sandpaper cut into small pieces
-1000 grit sandpaper cut into small pieces



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Mini 0000862dlb0319 added this to the To Make collection ago
Fe9d2a836a6694a32426954e541933e1?default=blank&size=40arrdvarrk added this to the Rock Tumbler collection ago
Mini sp logo grain 400x390Stamos added this to the tools collection ago
081a027e7ac6bdd0b6a50aa245cb3de4?default=blank&size=403DAmsterdam added this to the tools collection ago
Mini img 8016Peterthinks published this design ago