Addiator (for Point Counting)

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.

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

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.

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

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.

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.

Again, it takes caution to glue this part without glueing the moving ones.

Since the scales may move freely inside the body, a brake held against them by a rubber band is fixed on the body.

Here it is. I'm using a wooden skewer to use the addiator

Heres a video explaining how an addiator works :

https://www.youtube.com/watch?v=ryST18JJ7VU

For cutting it yourself. It's intended for 3mm thick material.