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2. Driven/ Driver30/10 = 315/30 = .5Multiple the two gear ratios in the system to get the overall gear ratio.3 * .5 = 1.5 Exercise I: A. Part NumberGear TypeNumber of Teeth Pitch diameterDiametral PitchGear Ratio H2472Spur723243:4H2496Spur96424L112YMiter241.5161:1L112YMiter241.516H1616RHelical161161:2H1632LHelical32216SpeedGear Pair 1Actual Velocity RatioTheoretical velocity ratioN1N256.03.751.601.33126.96.36.1991.3399.757.61.281.33
SpeedGear Pair 2Actual Velocity RatioTheoretical velocity ratioN1N254.004.001.001.0075.505.501.001.0097.257.251.001.00SpeedGear Pair 3Actual Velocity RatioTheoretical velocity ratioN1N254.002.002.002.0075.503.001.832.0097.253.801.912.00B.1. What is the service factor for the given application?1.25 2. What is the overall drive ratio?RPM Driver/ RPM driven1750/47= 37.23:1 3. If a belt drive is used for secondary reduction, what should be the ratio of the worm gear reducer? Belt drive ratio is 1.24.Overall Drive Ratio/ Belt drive ratio37.23/1.24 = 30.024. What is the actual torque at the reducer output shaft?Torque at head shaft/ Belt drive ratio2000/1.24= 1612.9 5. What is the normal torque? Actual Torque * Service Factor1612.9 * 1.25 = 2016.136. What is the selected size of the reducer based on the mechanical rating?