Industrial robotic arm wrist mechanism.
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Previously:
https://www.homemadetools.net/forum/...873#post183568
https://www.homemadetools.net/forum/...007#post221071
https://www.homemadetools.net/forum/...848#post220534
https://www.homemadetools.net/forum/...659#post118276
https://www.homemadetools.net/forum/...898#post129369
