Gears are fascinating mechanical components and they have different size, shape, function and forms. It is sometimes to difficult or time consuming to make animations of a gear or mechanical component composed of gears, yet I wanted to show demonstration of these kind mechanism without any user interface. The best place to do this was to use good YouTube videos for this purposes. I will add a collection of such mechanism whenever I find a good one. I will appreciate if you direct me to a good mechanism so that I can add them to my collections.

In the video above we can see very clever device where a full planetary gear is in between half geared sun and half geared ring gears. Notice also that the gear almost makes half revolution when it engaged to the sun gear and almost two revolution when it engaged to thering gear. I do not know what would be the application of this system be, but it is an interesting concept.