First stage ratio
$$ i_{gr1} = {z_2 \over z_1} $$
This calculation calculates the gear ration of two gear wheels using the number of teeth.
- z1 - number of theeth of first gear
- z2 - number of teeth of the second gear
This calculation is for 3 stage gearbox:
- i_{gr1} - first stage reduction
- i_{gr2} - second stage reduction
- i_{gr3} - third stage reduction
Three stage gearbox ratio
$$ i_{gb3} = {i_{gr1} . i_{gr2} . i_{gr3}} $$
