| I bent all pipe ends, in order to make it easier to bolt them together. 20 pipes make up a circle, so two pipes meet at a 16 degree angle, which translates to 8 degrees per pipe end. I put the anvil/vise next to a table, clamped each end into it and bent the pipe to a mark I had made on the table's edge.
And here they are: the pipes after squashing, drilling and bending.
Drilling, de-burring and bending all 262 pipes took me about 8 hours today. In addition to the time spent flattening the pipes and buying/making tools and materials, I think I've spent about 20 hours in total on this project. That's excluding the design time, however...
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