Whitworth with Pendulums

grabcad

Original project made with Autodesk Inventor 2014 as a Dynamic Simulation. Besides the gravity force, the action is due to a imposed motion applied to the Crank - 4 rot/min (240 deg/s). The simulation does not include any friction. The Whitworth mechanism is special because, during one entire rotation of the driven Lever, one half is more speedy from the other. This is obvious if you look to Video. While the crank is rotating uniformly the pendulums are rotating by abiding the dynamics laws. The Output Grapher.jpg presents the peripheral speeds of the two pendulums, with a maximum of 4500 mm/s = 4.5 m/s = 16.2 km/h. If you use Inventor, you have to download all the files in a single directory, then open the .iam file with Inventor 2014, 2015..., enter Environments/Dynamic Simulation and click on Play button. Instead of 10000 images you can apply 1000 images if you have to wait too much for the simulation. Enjoy!