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Just dropped my 4-axis robot arm! NEMA 23 + custom 5:1 planetary
gearbox at the shoulder, three NEMA 17s for base/elbow/wrist,
parallel gripper. Controlled live in Chrome over USB (WebSerial)
— full 3D sim, webcam hand tracking, iPhone LiDAR bridge.
~420mm reach, ±140° elbow.
Full source (app + firmware):
github.com/cambue12/Nema-motor-arm-controller
Heads up: Second Link and Link to Wrist are the latest revisions
but haven't been printed yet. The rest is built and running. 🤖
Robotic Arm
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