Ulmer Hocker (cnc)

I wanted to try out box joints on the CNC. One ideal piece for this is the Ulmer Hocker – a stool which every student of the HFG Ulm had to build. Originally it was designed by Max Bill (https://de.wikipedia.org/wiki/Ulmer_Hocker).

I did quite some research and I remembered the C-Möble from my professor Jochen Gros back in university. He did also think about how to handle wood joints on a CNC.

I must admit I never really liked the joints they were using since they always left visible holes in the corner of the joints to work around the issue that when you cut a part with a router you will always have a rounded corner in the size of the router bit diameter.

I wanted to find a solution which fits seamlessly. I ended up rounding the box joints with the same radius as the router bit I used for cutting the joints. This worked quite well.

I had a bit of an issue with the wood bending, especially on the side panels. I removed some material on the inner side – seems like if you do something like this, do it from both sides. Lessons learned…