Cycloidal spur gears, cycloidal helical gears
thingiverse
The pitch circle measures at 45mm (3 teeth), 60mm (4 teeth), and 75mm (5 teeth). The rolling circle's diameter for generating epicycloidal curves is consistent at 30mm. The center hole has a diameter of 6.4mm, appropriate for M3 bolts when used with 1/2 scale gears. An STL file of the 4-toothed helical gear was added on January 13, 2014.
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