After drawing several parts of a mechanical device, it is possible to bring them together as an assembly in Inventor and show how the parts move in relation to each other. The most important features to understand are the Constrain and Assemble tools. Constraints can force the faces of two objects to stay on the same plane or remain at a certain angle in relation to each other. They can also force parts to move at a given rate when when another part is moved. For example, a set of gears can have rotational constraints at a set ration so that when a small gear turns, a bigger gear will also turn so that the teeth will move at the same speed.
Assemblies can show people how a mechanism will move in the real world.
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