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.
Step 6: Last Piece of the Reset
Again, it takes caution to glue this part without glueing the moving ones.
Step 7: Making the Brake
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 :
Step 8: Svg File
For cutting it yourself. It's intended for 3mm thick material.