Algodoo

This is actually really cool! Ive never figured out a way to make a perfect wankel rotor before. I just kind of eyeball them.

@lethalsquirrel I will post a scene on how to make them without this machine. Also this machine makes the sides odd. The curves are not perfectly symmetrical although this would actually improve the sealing in a Wankel due to the asymmetrical motion of well-tuned rotors.

Its all due to the way the crank moves that lifts the laser cutter. If you removed the laser bar thing and replaced it with a piston, and then showed the plot for its positions, the motion is not a true sine wave. Instead the wave would have smaller crests. The piston stays at the bottom of the cylinder longer than it does at the top, but only very slightly. Which is why the lever makes the rotors odd.

In laser pen:

postStep := (e)=>{
fadeDist == 0 ? {
fadeDist = 10
} : {
fadeDist = 0
}
};

cuts faster

@s_noonan thanks