1X Tendon Drive Revo2

The 1X Tendon Drive is a proprietary actuation system developed by 1X Technologies that uses tendon-driven transmission instead of classic harmonic or cycloidal gearboxes. Motors and transmissions are moved off the joint axis and force is delivered through tendons to the end link, drastically reducing limb inertia and enabling 95% backdrivability. This forms the safety foundation for human-collaborative operation in home environments.

The system actuates the 1X NEO humanoid (declared total DoF: 22×2 in hands, 7×2 in arms, 6×2 in legs, 3 in neck, 2 in spine). Key vendor-declared parameters from the NEO product page: 2% torque accuracy, 0.1 mm repeatability, 1 mm positional accuracy, 2,000,000 nominal load cycles and 22 dB audible noise. Calibration is performed continuously by an AI-based adaptation loop.

The motor core is sometimes informally referred to in media and community discussion as Myofiber — a popular unofficial alias rooted in earlier communication about muscle-inspired tendon actuation; 1X uses the term 1X Tendon Drive consistently in current product materials. „Revo2” refers to the second generation of the motor core.

The product is not sold as a standalone component — it ships exclusively as an integral part of the 1X NEO humanoid (class: prototype / OEM-only).