Helical Gear and Pinion Calculator and Equations

Engineering & Design Gear Applications

This calculator will determine the following design variables for a gear and pinion:

 HELICAL GEAR CALCULATIONS PINION GEAR No. Teeth = N = Number of teeth (t = pinion  T = gear) Normal Pitch (DP) = DP = Normal Diametral Pitch  (  pi/CP  or  [1/MOD] x 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)) Center Distance (inch, mm) =

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