What do you understand by degree of freedom in a robot? Explain with an example.

In robotics, the degree of freedom (DoF) refers to the number of independent parameters that define the movement of a robot or position in its workspace. It defines how freely a robot can move in its environment, typically in terms of translation (linear motion) and rotation (angular motion). The DoF of a joint indicates the number of independent axes along which motion is allowed. The more DoF means greater flexibility and adaptability, allowing the robot to perform complex tasks. However, higher DoF also increases cost, complexity and control challenges.

Example: A simple robotic arm with three revolute joints has three degrees of freedom, meaning it can rotate in three different directions. Similarly, an industrial robot with 6 degrees of freedom (DoF) consists of six joints that allow it to move in three linear directions (X, Y, Z axes) and three rotational axes (pitch, yaw, roll). This range of motion enables the robot to reach different positions and orientations, making it ideal for tasks like welding, painting, assembly and material handling.