# Compound gear-train sizing
# Scope: Two ideal external gear pairs; losses supplied as one efficiency.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

driverA = 20
drivenA = 60
driverB = 15
drivenB = 45
speed = 3000 rpm
efficiency = 0.9

ratio := drivenA*drivenB/(driverA*driverB)
output := speed/ratio [rpm]
torqueMultiplier := ratio*efficiency

check output speed target: output >= 300 rpm

scenario alternative: driverA = 16


# Diagram dimensions are illustrative; teeth are schematic, not manufacturing profiles.
module = 2 mm
check whole driverA: abs(driverA-round(driverA)) <= 0
check positive driverA: driverA >= 3
check whole drivenA: abs(drivenA-round(drivenA)) <= 0
check positive drivenA: drivenA >= 3
check whole driverB: abs(driverB-round(driverB)) <= 0
check positive driverB: driverB >= 3
check whole drivenB: abs(drivenB-round(drivenB)) <= 0
check positive drivenB: drivenB >= 3