One of the best posts I’ve seen in a while. I’m a powersports development engineer and my internet rage was soothed by this gem.

A few folks here I can tell have gear design or mfg experience and have made good points. I just want to add that there are a ton of things that can go wrong with gears in addition to profile error. Including but not limited to: improper heat treat, burning the metal during grinding, violating case depth in the roots…