I had the idea to use this mechanical addition machine from the past as a game points counting device. The points counter I did was ok for numbers up to 99 but not very upsizable for bigger numbers.

Step 1: Cutting the Parts

The parts are from laser cut 3mm plywood with engraved numbers and symbols.

There are 4 main components :

The body (3 parts)
The scales that allow the additions to be calculated
The reset mechanism
The brake to ensure the scales won't move with gravity

Step 2: Chamfer the Result Holes

Since the plywood is much more thick than sheet metal that was used by industrial production, I chamfered the four holes to make the result more visible with a drill.

The chamfer is not very clean. Maybe it's not the best material for that, maybe the drill was too fast.

Step 3: Varnishing the Pieces

I used toothpicks to glue the pieces together. Before that I placed some in the holes when applying varnish to avoid clogging the holes.

Step 4: Reset Mechanism

Glueing the reset mechanism needs to be a bit cautious since it's easy to glue all the parts together. I glued and let dry the botom mount. Then I sled it in place. Squares do not need to be glued. I put them there, hoping for more rigidity.

Step 5: Glueing the Body

I pud glue only inside the 6 holes of the body and put toothpicks inside. Like the reset, it's very easy to glue all moving parts together. I cut after that the toothpicks flush.