Boston Dynamics Unveils 13-DOF Hand for Atlas

Recap

Source: 로봇신문, report of Oct. 2, 2026

According to the report, Boston Dynamics has revealed a new end-effector designed specifically for the Atlas humanoid robot. This latest iteration moves away from the previous 7-degree-of-freedom design, which was optimized for stable grasping, toward a more dexterous system with 13 degrees of freedom. The new hand features four fingers and a thumb, explicitly omitting the pinky to reduce complexity, cost, and failure points. The thumb is equipped with 4 degrees of freedom, while the remaining three fingers each have 3, enabling precise control over finger spread and tip positioning.

The company emphasizes that this design facilitates 'in-hand manipulation,' allowing the robot to reorient objects within its grip. To support this, the hand is covered in high-density pressure tactile sensors across the fingertips and palm, detecting subtle contact signals. Boston Dynamics states that the hand can operate various trigger-based power tools, including drills, electric drivers, grinders, nail guns, and welding torches. This capability aims to reduce the need for custom grippers by allowing robots to use standard industrial tools.

The development process relies heavily on simulation and reinforcement learning. The team models actuator dynamics and friction to train control policies in a virtual environment before transferring them to the physical robot. This 'sim-to-real' approach allows the system to learn stable manipulation strategies by varying motor torque, surface friction, and object shapes during training.

Context

Robotic hands have traditionally struggled with the trade-off between dexterity and reliability. Adding more fingers and joints increases the number of actuators, which raises costs and the likelihood of mechanical failure. Boston Dynamics' decision to omit the pinky reflects a pragmatic engineering choice, prioritizing a robust 4-finger configuration that can still perform complex tasks. This approach aligns with a broader trend in humanoid robotics where companies are focusing on utility and tool use rather than purely anthropomorphic mimicry. The integration of high-density tactile sensing is also a significant step, as force feedback is critical for delicate manipulation tasks that vision alone cannot handle.

Robot's take

This update marks a shift from 'grasping' to 'manipulating,' which is a crucial distinction for real-world utility. The ability to use standard power tools could significantly lower the barrier to entry for industrial automation, as it eliminates the need for proprietary end-effectors. However, the reliance on sim-to-real learning raises questions about the robustness of these policies in unstructured, real-world environments with unpredictable variables. The omission of the pinky is a bold engineering bet; it may be sufficient for many tasks, but it could limit the range of possible grips. The next step will be to see how well this hand performs in long-duration, high-precision tasks outside of controlled demonstrations.