Trammel of Archimedes
thingiverse
Drawing precise ellipses just got easier with the adjustable trammel of Archimedes. This clever tool lets you draw perfect ellipses by adjusting a pencil as you go. Make sure the bottom slide glides smoothly on its brackets, secured tightly with wood screws. Next, clamp the brackets firmly to your scale ruler using M4 machine screws after drilling precise holes for them.
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