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Ryan Moulton's profile photoManuel Gonzalez-Rivero's profile photo
If anyone else got nerd-sniped like me trying to figure out how the thompson joint works, I think I've cracked it. It's basically a double-cardan

but with the two joints inside of eachother. The figure-eight shaped structure is designed to ensure that the central joint takes half of the angle when the joint bends.
ah but... the problem with the thompson joint is that operating it at zero degrees causes excess wear and tear. Its not recommended for use in such cases and requires a minimum of 2 degrees for continuous operation.
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