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Re: Gear pitch
The addendum mods on the VP are to avoid undercut on the sun gears. The remaining mods are to make sure each ratio combination can work with the same ring gear and can be assembled.
I urge you to research the different ways one can screw up a planetary design. Things like assembly, vibration, and interference are all valid considerations that are equally important. Some combinations of valid tooth counts can't actually be assembled. The information is easy to find.
Paul
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In full disclosure I am the President of VEX Robotics, a division of Innovation First International.
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