Smart object

Trammel of Archimedes kit

Parametric Trammel of Archimedes (ellipse drawer / do-nothing machine): a cross base plate with two perpendicular straight slots, plus an arm bar carrying two slider pegs and a tracer point. Slide the pegs in the slots and turn the arm — the tracer sweeps an ellipse of semi-axes a and b. Set plate size, slot length, arm length, peg offsets and pin-bore diameter; print the pegs separately or use bolts.

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