A robot dog servo set needs torque consistency, current headroom and replacements you can actually buy again.
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Robot dogs punish weak servos because many joints load at once. A servo that works in a static arm may sag in a quadruped where legs need continuous support.
Buy a few spare servos from the same source. Mixed servo batches can have different center points, speeds and torque behavior.
Pulling current matching products on AliExpress…
12 affordable metal gear servos and slow gait.
Upgrade hips first, then knees.
Avoid it. Matched servos simplify gait tuning.
They are holding load continuously or fighting poor geometry.
Hip servos and the power rail.
Start with this prompt prefilled, then let RoboHub generate the live parts list, wiring plan, CAD and firmware.