ball joint for prosthetic elbow
thingiverse
This is the key component for the Enable France project, creating a mechanical Arm to adapt the Hackberry Hand. Work on this part remains in progress as of December 2019. I utilize a tension spring measuring 5mm x 20mm with 0.8mm wire. Still under development, I'm working on deploying the command in the forearm using string within a PTFE tube. The elbow is comprised of a joint ball that can be locked with inner small 6.35mm balls. Parts E1 and E2 are the external rotula. Parts I1, I2, and I3 are internal rotula. The Arm part can be found at https://www.thingiverse.com/thing:4009877. The Hackberry Hand is available on GitHub. The anchor and base were specifically designed for a 12-year-old boy without a left arm.
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