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The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear. › blog › steps-to-calculate-a-gear-ratio. In this section we focus on the most commonly used machine element, gears. affected by a number of factors: motor power, gear ratio, mass, and friction. Tutorial on how to calculate the gear ratio for two spur gears. the motor torque with a factor of 3 then you need a gear reducer with a gear ratio. Gearbox service factor is the ratio of the gearbox rated horsepower or torque to the application's required horsepower or torque. Transmission ratio factor ki The overall ratio of the gearbox. torque multiplied by the gearbox ratio, if the absorbed torque is unknown. Gearbox Service Factors. What is a service factor exactly? It's the ratio of horsepower your gear reducer can mechanically handle compared to the horsepower. We calculate the gear ratio between two gears by dividing the greatest common factor. a decimal number - expressing the gear ratio as a. When first diving into the gears' world, you may come across several terms: gear ratio and contact ratio. You do not have to know how to. 3) Determine the gearbox ratio as well as any reduction outside the gearbox (pulleys, gears, etc.). 4) Determine the applicable service factor and overhung.