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I model gears all the time In I-Deas that have true involute curve teeth. I use function splines in I-Deas. I think they have what they call law curves in NX that would do the same thing. I do not know for sure about this.
Of course I can model gears with sketch within NX (already made a sketch for it where I only need to give the number of teeth, modulus and pressure angle...).
But I was wondering if there was a module available within NX to do this for me..