I use a lot of laser cut parts and they always have a burr on the underside. So I made a rotary tumbler to finish a lot of parts simultaneously. The builder only took about half a day and is well worth it. Now when I take some parts of the CNC I can just throw them in there and not worry about de-burring anything.
There is also a full Instructable in the description.
Tumbler works well, and granite is a good substitute for commercial ceramic media. That it produces a good surface texture is equal or better proof than deburring corners.
I have one suggestion; one to three helical fins inside will increase the 'agitation' and reduce processing time. Rivets and silicone sealant will do the trick.
...we'll learn more by wandering than searching...
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