Isme: Id love to know how you do this excel thingy in CAD, i use Solidworks but i cant get it working. I got the formulas, so thats not the problem. I got problems to get the epitrochoid house exact.
fyffe555: "The Housing shape is actually easily defined and drawn and so presumably turned into Gcode. It's an epitrochoid, or in english it's the shape produced by a point on a circle rolling around another circle twice the diameter of the first, much the same way as a spirograph works." - This isnt entirely correct because the wankel got the formula Y=e*COS(3a) + R*COS(a) , X=e*SIN(3a) + R*SIN(a). Where e is eccentricity, the amount of offset between the eccentric shaft; R which is generating radius, the distance between the rotor centerline and the rotor's apex. a is 0-360 degrees.
And those who dont know anything about Wankels, try this german page:
http://www.der-wankelmotor.de/Techni...km_vs_kkm.html and then use Babelfish:
http://babelfish.altavista.com/