THIRD ARM

The structure of a third arm is usually mostly mechanical and can be called a kinematic chain. The chain is formed of links, actuators, and joints which can allow one or more degrees of freedom. Most contemporary third arm use open serial chains in which each link connects the one before to the one after it. These third arm are often resemble the human arm. Third arm used as manipulators have an end effector mounted on the last link. This end effector can be anything from a welding device to a mechanical hand used to manipulate the environment.