HELICAL GEAR
CALCULATIONS 		PINION GEAR Description
No. Teeth =  N = Number of teeth
 (t = pinion  T = gear)
Normal Pitch (DP) =  DP = Normal Diametral Pitch
  (  pi/CP  or  [1/MOD] x 25.4  )
Transverse DP =  Trans DP = Norm DP * cos(HA)
Circular Pitch (Inch) = 
Circular Pitch (mm) = 
Module (Inch) = 
Module (mm) = 
Normal Pressure Angle = 
PA = Normal Pressure Angle
Transverse
 Pressure Angle =  		tan(TransPA)
 = tan(NormPA) / cos(HA)
Helix Angle =  HA = Helix Angle
Pitch Diameter
 (inch, mm) =  		Pitch Diameter
 = N / (Norm DP * cos(HA))
Outside Diameter
  (inch, mm) =  		OD
 = PCD + 2 * Corrected Addendum
Correction Factor =  Std. kp = 0.4 * (1 - (t / T))
Corr. Addendum = Corr. Add. = (1 ± kp) / Norm DP
Center Distance
 (inch, mm) =