Braille Mechanical Calculator

I have always had an interest in mechanical calculators and how they work. Pinshape was running a contest on accessibility tools and I decided to build this model as a way to learn how the Addiator Mechanical Calculator worked and to learn how to represent numbers in Braille. There are much better solutions using modern digital calculators but this is still a fun model to play with.

The calculator can do addition and is modular so you can add as many place value columns as you want.