Trammel of Archimedes
grabcad
Animation video: https://www.youtube.com/watch?v=NtgNvT4Yaaw 3d Print Video: https://www.youtube.com/watch?v=bo5jpwA4kI8 This mechanism consists of a base with three slots intersecting at angles. Three sliders are confined within the slots and are attached to a handle by pivots (screws) at fixed positions along the handle. It is often sold in novelty shops with interesting names like Bullsh*t Grinder, Bullsh*t Masher or Do-Nothing Machine. Interestingly, most of the names are preceded with state names such as Arkansas, Kentucky, etc. I guess that’s how locals make fun of their neighbors. Build Instructions: http://www.instructables.com/id/Trammel-of-Archimedes-3D-Print/
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