Diametral Pitch

on . Posted in Gear

gear pressure angle 1Diametral pitch, abbreviated as DP, is the ratio of the number of teeth to the pitch circle diameter.

 

Diametral Pitch formula

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

 

Diametral Pitch formula

\(\large{ DP = \frac{\pi}{CP} }\) 
Symbol English Metric
\(\large{ DP }\) = dimetrical pitch \(\large{dimensionless}\)
\(\large{ CP }\) = circular pitch \(\large{in}\) \(\large{mm}\)
\(\large{ \pi }\) = Pi \(\large{3.141 592 653 ...}\)

 

Diametral Pitch formula

\(\large{ DP = \frac{n_p \; \left( GR \;+\;1 \right)  }{2 \; CD} }\) 
Symbol English Metric
\(\large{ DP }\) = dimetrical pitch \(\large{dimensionless}\)
\(\large{ CD }\) = center distance \(\large{in}\) \(\large{mm}\)
\(\large{ GR }\) = gear ratio \(\large{dimensionless}\)
\(\large{ n_p }\) = number of teeth on the pinion \(\large{dimensionless}\)

 

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Tags: Gear Equations