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Reverse Gear
Base Circle Diameter
Gear term index
    
The base circle from which an involute tooth curve is generated or developed.  
Whereas:
From Gear Data
Mn = module normal (8)
z = number of teeth in the gear (61)
ß = helix angle (15º)
an = pressure angle normal (20º)

Calculated:
at = pressure angle transverse (20.6469º)
Formula:
= Mn*(z/cos(ß))*cos(at)
= 8*(61/cos(15))*cos(20.6469)
= 8*(61*0.965925)*0.935771
= 472.765mm

PAt (Pressure Angle Transverse)
= atan(tan(an)/cos(ß))
= atan(tan(20)/cos(15))
= atan(0.363970/0.965925)
= 20.6469º

 
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