Quote:
Originally Posted by Joey Milia
What literature are you reading where you're seeing slightly larger pressure angles? I'm not super familiar with mating shifted gear profiles and non shifted profiles so not sure whether thats the case or not.
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Whenever you use shifted profiles, the manufactured pressure angle and the working pressure angle diverge. They are still labeled and sold by their manufactured pressure angle, but since the base diameter has changed, the pressure angle will change as well.
https://sdp-si.com/D805/D805_PDFS/Te...l/8050T034.pdf
http://khkgears.net/gear-knowledge/g...ar-dimensions/
http://khkgears.net/wp-content/uploa...n-to-Gears.pdf
https://www.bostongear.com/pdf/gear_theory.pdf
Welp, as I've typed this, I realize I may have gotten my signs crossed. At first I just went off the fact that positive profile shifting causes the profile to resemble larger pressure angles, what with the wider tooth thickness and narrower top land. But now that I think about it, this might have been incorrect. I know the working pressure angle changes, but I can't remember whether the change is positive or negative. I'll try and give you a definitive answer on this within the weekend, but right now it's almost 5 in the morning and I'm supposed to be studying for finals.
Or sleeping. That too.
EDIT - I forgot one of my better sources.
http://www.geartechnology.com/issues...file-shift.pdf
Interestingly enough, this source only adds to my confusion. I'll sleep on it, and get back to you.