The number of independent movements a robot or mechanism can make. Each degree of freedom represents one axis of motion, either rotational or translational.
Count how many different ways a robot can move. Your arm has 7 degrees of freedom (shoulder: 3, elbow: 1, wrist: 3). More DoF means more flexibility, but also more complexity and cost.
Why It Matters
Degrees of freedom determine what a robot can physically do. A 3-DoF robot can position its tool in 3D space but can't rotate it. A 6-DoF robot can reach any position from any angle, making it suitable for complex tasks like welding or surgery. Humanoid robots often have 30+ DoF to mimic human movement.
Real-World Examples
- A 4-DoF SCARA robot picking and placing components on a PCB assembly line
- A 6-DoF industrial arm performing arc welding with full orientation control
- UBTECH's Walker S humanoid robot with 41 degrees of freedom for human-like locomotion
Chinese humanoid robot companies are pushing DoF boundaries. Unitree's H1 has 26 DoF, UBTECH's Walker S has 41 DoF, and Fourier Intelligence's GR-2 features 53 DoF. More DoF enables more human-like movement, which is critical for China's strategy of deploying humanoids in manufacturing.
