This is a post about the process of creating the basic 3D CAD model of the Wankel Engine with pictures. This is meant as a reference and not a tutorial due to the lack of instructions; there are simple descriptions beside each picture describing what is happening.
The rotor orbits 3 times for every 1 revolution it makes. This compound motion defines the path that the rotor corners take, and the casing geometry.
The eccentricity / orbital motion was moved at 6 (originally 3) degree increments
The rotation of the rotor moved at 2 (originally 1) degree increments
A spline was made between the defined points. This is called an epitrochoid curve (for more information please look here and here)
Gear tooth was defined by an involute profile
Incomplete model – demonstrates curve geometry
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