In a robot there is a joint where ever you put a motor that will move the metal/plastic "bones" of the robot so you can have as many joints as you like.
Source:
My Brain
It depends on what kind of robot you are talking about.
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Study which deals with the construction and components of a robot. (It deals with the components such as wrist, arm, joints and body).
However many the designer wants it to have.
The work envelope of a polar robot, also known as a spherical robot, is defined by its two rotational joints, which allow for movement in a spherical coordinate system. This design enables the robot to reach points within a spherical area, characterized by a certain radius from the base. The work envelope is typically limited by the robot's arm length and the range of motion of its joints. Consequently, polar robots are particularly effective for tasks that require reaching around obstacles or manipulating objects in a three-dimensional space.
Stationary Robots. These are robot that are fixed in position. They tend to have robot arms that can move about. The diagram below shows a large-scale stationary robot arm. It has mobile joints called 'the wrist', 'the elbow', 'the waist' and 'the shoulder'.
elbow neck shoulder feet knee finger nose
sliding joints hinged joints fixed joints
The three main types of joints in the body are: ball-and-socket joints (hip and shoulder), hinge joints (knee and elbow), and pivot joints (neck).
The future of robot joints is likely to focus on bio-inspired designs, utilizing soft robotics for greater flexibility and adaptability. Advances in materials science, such as smart materials and soft actuators, will enable joints that mimic human movement more closely. Furthermore, the integration of artificial intelligence will enhance the coordination and functionality of these joints, allowing robots to perform complex tasks in dynamic environments. Overall, the future of robot joints will emphasize agility, efficiency, and collaboration with humans.
The three joints that make up the elbow are the radiohumeral, proximal radioulnar and the ulnohumeral.
click on all three of the window to free the robot