Controlling Rotation Around a Point 17 April 2018, 21:00 Sorry, your browser doesn't support embedded videos, but don't worry, you can download it and watch it with your favorite video player! Inputs: green shaft driven by grey motor and yellow shaft driven by green motor. Cylindrical bar fixed to blue gear moves around a point at various angles. The bar point moves on a sphere. This mechanism is used for moving the welding head. « previous mechanism Scroll Compressor next mechanism » Scott-Russel Straight Line Mechanism load comments Please enable JavaScript to view the comments.