Tumble finishing
Technique for smoothing and polishing a rough surface on relatively small parts / From Wikipedia, the free encyclopedia
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Tumble finishing, also known as tumbling or rumbling,[1] is a technique for smoothing and polishing a rough surface on relatively small parts. In the field of metalworking, a similar process called barreling, or barrel finishing,[2] works upon the same principles.
Tumbled stones are made with rock tumblers in a process very similar to the natural processes that produce "sea glass" or "beach glass".