Celts1, wobble stones, or rattlebacks possess the interesting property of having a preferred direction of rotation. This property occurs because of the distribution of the mass of the body and the geometry at the contact point. This paper presents the design equations for wobble stones in general and describes a project in the Rapid Design Prototyping Class at Ohio State to design and manufacture wobble “stones” using CAD/CAM and an injection molding machine.

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