Input: blue crank.
Output: green disk
The pin that interacts with the disk slots is placed on the satellite pinion (in pink). Its center traces a square (in pink). For other curves see:
https://youtu.be/XDZAvCDoMhg
Zg/Zp = 2n/(n-2)
R + r = B.sin(Pi/n)
Zg: tooth number of the stationary grey gear.
Zp: tooth number of the pink gear.
n: number of slots on the green disk, Here n = 4
R: distance from axis of the pink gear to rotary axis of the blue crank.
r: radius of the pink crank.
B: distance between two stat
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