More at auto-parts.quickfound.net “DEMONSTRATES PRINCIPLES OF OPERATION GOVERNING MULTIPLE SETS – SHORT REVIEW OF THE THREE PLANET CARRIER LAWS.” Public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied. The soundtrack was also processed with volume normalization, clipping reduction, and equalization. US Army training film TF9-1856 see also: starter motors: www.youtube.com power steering: www.youtube.com drum brakes: www.youtube.com en.wikipedia.org Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Planetary gears (or epicyclic gears) are typically classified as simple and compound planetary gears. Simple planetary gears have one sun, one ring, one carrier, and one planet set. Compound planetary gears involve one or more of the following three types of structures: meshed-planet (there are at least two more more planets in mesh with each other in each planet train), stepped-planet (there exists a shaft connection between two planets in each planet train), and multi-stage structures (the system contains two or more planet sets). Compared …