Rock-tumbler kits marketed for children and hobbyists ... with natural materials such as walnut shells replacing industrial abrasives. If you are interested in pursuing rock polishing as a hobby ...

If you’re reading Hackaday, there’s a good chance you had a rock tumbler in your younger days. Hell, we’d put odds on a few of you having one rumbling away in the background as you read this.

If you’re reading Hackaday, there’s a good chance you had a rock tumbler in your younger days. Hell, we’d put odds on a few of you having one rumbling away in the background as you read this.

Or, if you’re Claire Saffitz and stressing to re-create a gourmet version of Jelly Bellys, use it to tumble your homemade jelly beans into industrial-level smoothness. The rock tumbler was one ...