thread408-278533
Butterfly valve linkage calculation
Follow up response
This is a classic function generator problem. Input and output specified angular relationships. Define the input angles you want and the corresponding output angles you want. Your mechanism kinematics textbook will show...
construction instructionshttp://files.engineering.com/getfile.aspx?folder=8d1f23b5-847e-4e14-a777-7a6f569ed356&file=DETC2015-47118_remote_center_of_motion.pdf
Having a rigid body rotate around a point is not possible with a 4 bar linkage if you cannot use the center point as a pivot. However this can be done with a 6 bar linkage. It is called a remote center mechanism. I'll attach a video to illustrate and a paper describing the construction...
