From Tinkernology: http://tinkernology.blogspot.com/2011/06/spring-forming-machine.html
I have never seen something like this before, but CNC machines and the like continue to impress me. I've seen "extruding" or extending machines before that do work on pipes, but this is a bit more unique. I find it interesting that the arms are extended by cams (as seen towards the end of the video) instead of a rack and pinion or screw advance. Cams will work just fine, but I assume that sometimes they take extra work to implement because they need to efficiently exert force in the right direction on the object they're linked to (or the other way around). Often there's a lot of sideways motion or resistance to friction.
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