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Can I just say, as an engineering graduate, I have no idea why the idea of angle of engagement has gotten any traction in the airsoft community.
If the rack and pinion are involute profiles, then the line of action of the force transmitted is purely a function of the radius of your sector gear. "Angle of engagement" as a variable that will change pressure distribution or force direction does not exist. By shaving off teeth and having your gears mesh at the 12 oclock position, all you are doing is having your involute profiles smash together at 90 deg instead of sliding/rolling over one another like a proper gear mesh.
Maybe there's another thread on here somewhere related to AoE where I can get some insight on why people do it when the physics/mechanics are so wrong?
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