Figure Wheels and Sector wheels
The figure wheels are made from 40-teeth gear. Each figure wheel can store one digit (0 to 9).
The nerigboring figure wheels are connected by a sector wheel, which is a section of a 40-teeth gear.
The combination of figure wheels and sector wheel can perform additions.
I chose the size of figure wheel to be 60mm, so that it is not too small and hard to print, and not too large to fit in my 3D printer.
![](https://cdn.hackaday.io/images/5339211701027387862.jpg)
![Figure wheel numbers Figure wheel numbers](https://cdn.hackaday.io/images/9252271701027387776.jpg)
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