Spent some time milling some of the quarter inch bar I’m using for the
chamber steel cage. To build the cage, the pieces need to have half of the
dihedral angle of the cuboctahedron (125 degrees, 14 minutes). Getting a
28 degree angle was, shall we say, interesting. The required angle such
that two fit together correctly, is 27 degrees 46 minutes. I have this
interesting 2 axis rotating vice which worked fine to get the angle, but how on
earth do I clamp it? I ended up cutting a piece of an aluminum tube at the
correct height, and then using standard clamping at the end. I was worried
that it wouldn’t be secure, but turned out fine. Of course, the quarter
inch bars are a bit bent – it was cut from 12 foot lengths into 2 foot lengths.
As the guy from Allen Steel was carrying them around to cut, they were naturally
oscillating and bending. <sigh> Kinda makes it a pain in the ass.
Won’t have time tomorrow to do anything as I’m helping a friend with her
garage sale. Hopefully I’ll have enough time next week to get all 48 edges
cut out (2x per cuboctahedron edge) and ready to be welded.