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#drawingmachine
Why draw a picture when I can design a machine to draw one for me? That's exactly what I've done here using a DC motor, a pulse width modulator, and a mix of 3D printed and off the shelf components.
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The inputs were chosen from practicality; belt ratios, cam eccentricities, pen location. I designed this machine to draw something, but I had no concept about what would result. Upon arbitrarily selecting a combination of these inputs, to my own amazement, beautiful polar symmetric shapes manifested!
 The large brass nut serves to press the pen against the paper |  Every output is entirely unique and a complete surprise |  DisassembledCheck out those press-fit ball bearings in the square plates |
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 UndersideA variable speed pulse width modulator is connected to a DC motor |  Gears and pulleys |  Partial CAD Assembly Left |
 Partial CAD Assembly Right |  Original sketches |  To draw one period of these polar wave forms takes about 20 minutes |
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