Calculating Chimp

We’ve made a large version of this simple number multiplying mechanism using the big laser cutter.  Here is a video explaining what we did (also at

This was based on a really good pattern designed by Jürgen Weigert and downloadable from

Original Calculating Monkey

The original was for an A4 sheet of 3mm ply.  So, when expanded to an A1 sheet of 2mm card it had to be extensively “adjusted”.  To be honest building the A1 version did reveal a large number of potential improvements that we really should make to the design.  Were we to build another one we would have to apply quite a few changes to make it as good as Jürgen’s version.

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