Feeling like an idiot because I was trying to work out the shape of bevel gears and got stuck on an assumption that now seems very obviously false and had to look up how to proceed 
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(Basically, the gear operates on a sphere, I was trying to make it work with cones, but you can’t intersect two cones in the right orientation to get a surface)
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Thinking about bevel gears in terms of spheres is actually remarkably beautiful
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