Soroban - Fully Parametric & Configurable Abacus
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Japanese abacus. Change the parameters for different sizes, types - Soroban, traditional or modern; Chinese Suanpan, ...
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I recently watched a video of Japanese school kids using their Soroban to calculate at incredible speed; apparently it also helps with learning to do very fast mental calculation. I was impressed, and wanted to try and learn that – after designing and printing my own Soroban, naturally 🤪
I designed this Soroban in FreeCAD (Link branch version 2023.01.31).
The model is fully configurable and you can easily change the number of rods/digits, beads, and most dimensions by editing the spreadsheet values inside the CAD file.
That also means you can change it to a traditional Soroban with five earthly beads, or a Chinese type Suanpan with two heavenly beads. Or even a hexadecimal programmer's soroban!
I don't own a standard Soroban, so I don't know if the dimensions are correct/typical. If you do, please comment so I can improve it!
To change the parameters:
- Download the FreeCAD file (.FCStd)
- Open it with FreeCAD Link branch (you can get it here: FreeCAD Link Branch)
- Double-click the “parameters” spreadsheet icon in the model tree on the left
- Edit the spreadsheet values – The model will update automatically!
- Select the parts/bodies in the model tree and do File → Export (or Ctrl+E) and save as .stl
("frame", “innerframe”, “bead”, one after the other)
FreeCAD will automatically recompute the model each time you change a spreadsheet value. This can be slow – you can right-click the “soroban”-document in the model tree and select “Skip recomputes”. When you're done editing the values, re-enable, or click the recompute button (F5).
Assembly:
- Cut your rods to the required length (≈75mm for the STLs I uploaded). I used pieces of 2.85mm filament.
- Thread the beads onto the rods.
- Place/snap the rods into the frame.
- Snap the inner frame into the outer frame. This may need a bit of force.
- Put the indicator dots into the small holes. I used pieces of 1.75mm filament.
There are plenty of tutorials for learning Soroban calculation on youtube and elsewhere.
When you make one, let me know!
Enjoy!