Trammel of Archimedes- 2 Pass
grabcad
See more advanced version here: Trammel of Archimedes More info on this build: http://www.instructables.com/id/Trammel-of-Archimedes/ This mechanism consists of a base with two slots intersecting at right angles. Two sliders are confined within the slots and are attached to a handle by pivots (screws) at fixed positions along the handle. The mechanism can be used for drawing a perfect ellipse. This is done by positioning a writing utensil at the end of the handle while making a full revolution.
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