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Addendum
Gear term index
    
The height of the tooth above the pitch circle or the radial distance between the Tip Diameter (1) and the Pitch Diameter (2)
Whereas:
From Gear Data
Mn = normal module pitch (8)
DPn = normal diametral pitch (3.175)
x = profile shift coefficient (0)
Formula:
Addendum Module Pitch:
= Mn*(1+x)
= 8mm

Addendum Diametral Pitch:
= 1/(DPn*(1+x))
= 1/3.175
= 0.315inches
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