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Active Profile
Gear term index
   
This is a portion of the surface of the gear tooth which at some phase of the meshing cycle contacts the active profile of the mating gear tooth. In other words, it is the part of the gear tooth profile which actually comes in contact with the profile of its mating gear tooth along the line of action.
It extends from the limit diameter or SAP (start of active profile) (2) to the effective outside diameter (1) or EAP (end of active profile) near the tip of the tooth.
Whereas:
From Gear data


Calculated

Formula:

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