Number of Teeth

Number of teeth, abbreviated as \(n_t\), is the number of teeth contained in a gear.

 

Number of Teeth formula
\(\large{ n_t = DP \; PD  }\)
Symbol	English	Metric
\(\large{ n_t }\) = number of teeth	\(\large{dimensionless}\)
\(\large{ DP }\) = dimetrical pitch	\(\large{in}\)	\(\large{mm}\)
\(\large{ PD }\) = pitch diameter	\(\large{in}\)	\(\large{mm}\)

 

Number of Teeth formula
\(\large{ n_t = \frac{ \pi \; PD }{ CP }  }\)
Symbol	English	Metric
\(\large{ n_t }\) = number of teeth	\(\large{dimensionless}\)
\(\large{ CP }\) = circular pitch	\(\large{in}\)	\(\large{mm}\)
\(\large{ PD }\) = pitch diameter	\(\large{in}\)	\(\large{mm}\)
\(\large{ \pi }\) = Pi	\(\large{3.141 592 653 ...}\)