Pitch Diameter

on . Posted in Gear

gear diameter 1Pitch diameter, abbreviated as PD, is the diameter of a gear pitch circle.  The pitch diameter is used to generate the pitch circle.

 

Pitch Diameter formula

\(\large{ PD = \frac{n}{DP} }\) 
Symbol English Metric
\(\large{ PD }\) = pitch diameter (diameter of pitch circle) \(\large{in}\) \(\large{mm}\)
\(\large{ DP }\) = dimetrical pitch \(\large{in}\) \(\large{mm}\)
\(\large{ n }\) = number of teeth on the diameter \(\large{dimensionless}\)

 

Pitch Diameter formula

\(\large{ PD = \frac{n \; CP }{\pi} }\) 
Symbol English Metric
\(\large{ PD }\) = pitch diameter (diameter of pitch circle) \(\large{in}\) \(\large{mm}\)
\(\large{ CP }\) = circular pitch \(\large{in}\) \(\large{mm}\)
\(\large{ n }\) = number of teeth on the diameter \(\large{dimensionless}\)
\(\large{ \pi }\) = Pi \(\large{3.141 592 653 ...}\)

 

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Tags: Gear Equations