Basic Formulas for Multi-turn gearbox and Part-turn gearbox

Basic Formulas

MA(Mechanical Advantage)=Output torque/Input torque

Overall mechanical efficiency=MA of spur gear ×MA of worm gear

Input torque= Output torque/MA

Output torque=Input torque ×MA

Efficiency%= (Output torque ×100)/(Input torque ×Gear Ratio)

Overall Efficiency%=(Spur efficiency ×worm efficiency)/100

Ratio= Number of turns of input/Number of turns of output

Overall ratio=Spur gear ratio×Worm gear ratio

Number of turns to close =Gear ratio/4

Closing time(min)=Number of turn to close/Input speed(RPM)

Closing time(sec)=Number of turns to close×60/Input speed(RPM)

Input Speed(RPM)=Number of turns to close/Closing time(min)

Number of turns to close=Input speed(RPM) ×Closing time(min)

Input torque=(hand wheel rim effort×hand wheel diameter)/2

Hand wheel rim effort =(Input torque×2/Hand wheel diameter

Hand wheel diameter=(Input torque×2)/Hand wheel rim effort