Unitree G1 Humanoid Robot Teardown

Humanoid robotics development relies on balancing performance, cost, and scalability, as evidenced by the Unitree G1 teardown. Actuation strategies utilize either strain wave gears for high gear ratios and compactness or planetary gear sets for backdrivability and torque transparency. Thermal management remains a critical engineering challenge, addressed through innovative solutions like heat pipes—typically reserved for CPUs—and integrated fan-based air cooling systems. Design decisions, such as using CNC-machined billet parts instead of castings, prioritize rapid time-to-market and iterative development over mass-production efficiency. Complex mechanisms like the Rotary Spherical Universal (RSU) joint enable multi-degree-of-freedom movement, though they introduce challenges in torque sensing and environmental durability. Future advancements will likely involve adopting automotive-scale manufacturing approaches to reduce component costs, such as transitioning from traditional load cells to commoditized MEMS-based force sensors.