WristWristFigure 2-10 shows how the wrist is attached to a jointed arm. The wrist is similar to a human wrist and can be designed with a wide range of motion, including extension, rotation, and twisting. This aids the robot in reaching places that are hard to reach by a human arm. It comes in handy especially when spray painting the interior of an automobile on the assembly line. It is also helpful in welding inside a pipe. This type of flexibility will improve the manufactured products we now enjoy and add others we were unable to fabricate earlier.
Mark R. Miller; Rex Miller: Robots and Robotics: Principles, Systems, and Industrial Applications. Wrist, Chapter (McGraw-Hill Professional, 2017), AccessEngineering