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Reverse Gear
Line of Action
   
The path of contact in involute gears. It is the straight line passing through the pitch point and tangent to the base circles in mating gears.
In other words, its intersection with the centreline of the two base circles defines the pitch point, the line of action is the path the teeth follow while in contact.
Whereas:
From Gear Data

Formula:

 

 

 

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