55/35 special gear set for pi approximation on Harrison lathe
thingiverse
A Special Gear Pair for Approximating Pi A custom gear pair featuring a 55-tooth and 35-tooth arrangement can be created to enable the approximation of pi on a Harrison L5 lathe. This setup is particularly useful when turning threads that match worm gears, as the 55/35 ratio closely approximates the value of pi/2. If you require adjustments to bore and keyway dimensions, you may want to utilize the customizer version of this design, which allows you to print each gear separately or download the SCAD files for manual modifications in OpenSCAD.
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