Formula : Σ Ø = n/dp
n being the number of teeth of the set of two pinions
dp being the pitch diametral (number of teeth on the pinion diameter in inch).
180 Gear Ring 95/133 teeth
We know that the wheel of 133 teeth goes with a pinion of 19 teeth. Total = 152
ΣØ= 152/38
= 4 inches
Ø19 teeth = 0,5 inche
So Ø 133 teeth = 3.5 inches (primitive diameter) x 25.4 to have this measurement in mm.
3,5 x 25,4/133 = 0,66842105263 (module) en mm.
The wheel of 95 teeth goes with a pinion of 19 teeth. Total = 114
ΣØ = 114/38
= 3 inches
Ø 95 teeth = 2,5 inches (primitive diameter)
2,5 X 25,4/95 = 0,66842105263 (module) en mm
For wheel of 57 teeth, primitive diameter = 1,5 inche.
For wheel of 171 teeth, primitive diameter = 4,5 inches.