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However many the designer wants it to have.
It depends on what kind of robot you are talking about.
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
Entertainment robots apparently have 7 flexible joints.
50
4
P. Th. L. M. van Woerkom has written: 'Accuracy of modal frequency set with fictitious joints modelling' -- subject- s -: Flexible bodies, Joints, Modal response, Manipulators 'On fictitious joints modelling of manipulator link flexibility for the HERA simulation facility pilot' -- subject- s -: Joints, Hermes manned spaceplane, Manipulators 'Synthesis of local control for a robotic manipulator joint' -- subject- s -: Actuators, Joints, Robotic manipulators 'Equivalent flexibility modelling for the recursive simulation of robot manipulator dynamics' -- subject- s -: Flexible bodies, Many body problem, Manipulators 'Quasi-recursive dynamics equations for spacecraft-based flexible robotic manipulators' -- subject- s -: Flexible bodies, Many body problem, Dynamic models, Manipulators
A robotic vacuum cleaner typically has two flexible joints: one at the base where the vacuum head connects to the main body, and another at the point where the main body connects to the wheels for maneuverability.
Many bones have many joints, hence, great flexibility.
No, not all joints in the body are involved in movement. Some joints, like those in the skull, are immovable and serve to protect vital structures. Other joints, like those in the spine, are designed for stability rather than a wide range of motion.
There are typically four common sizes of U-joints used in cars and trucks: 1310, 1330, 1350, and 1410. These sizes refer to the series or dimensions of the U-joint.