https://www.youtube.com/watch?v=m1mPhCjeG-g Does anyone know how I can go about making these sort of joints for making a hoberman sphere.
Thanks!
Good ol’ google search has got your back 
Hoberman taught a course at MIT with Erik Demaine and Daniela Rus a few years ago, and the lecture slides are available here:
http://courses.csail.mit.edu/6.S080/lectures/
The geometric principles for these scissor mechanisms are shown in weeks 2,3 and 5.
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