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Compound Gear Ratios

Compound Gear Ratios. Teacher Professional Development Spring, 2002. Robotics Academy 2002. All Rights Reserved. Simple Gear Ratio. You know how to compute the gear ratio of a single pair of gears. 40 teeth. 8 teeth. Gear ratio = 40 to 8 or, simplifying, 5 to 1. Compound Gear Ratio.

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Compound Gear Ratios

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  1. Compound Gear Ratios Teacher Professional Development Spring, 2002 Robotics Academy 2002. All Rights Reserved.

  2. Simple Gear Ratio You know how to compute the gear ratio of a single pair of gears. 40 teeth 8 teeth Gear ratio = 40 to 8 or, simplifying, 5 to 1.

  3. Compound Gear Ratio A gear box with more than one pair of gears is called a compound gear box. A compound gear ratio is the overall gear ratio of the compound gear box.

  4. Compound Gear Ratio To compute a compound gear ratio, we must first find the gear ratios of each individual pair of gears. What is the gear ratio of this pair of gears? Answer: 3 to 1

  5. Compound Gear Ratio What is the gear ratio of this pair of gears? Answer: 3 to 1

  6. Compound Gear Ratio If this axle were to make 90 rotations, how many rotations would this axle make? Answer: 30

  7. Compound Gear Ratio And if this axle were to make 30 rotations, how many rotations would this axle make? Answer: 10

  8. Compound Gear Ratio 90 30 10 What does that imply about what the overall gear ratio is?

  9. Compound Gear Ratio Answer: 9 to 1 To compute the compound gear ratio, we multiply the gear ratios of each pair of gears in the gear box. (3 to 1) x (3 to 1) = 9 to 1

  10. Compound Gear Ratio What is the compound gear ratio of this gear box going from bottom to top? Gear ratio 3: 3 to 1 Gear ratio 2: 3 to 1 Gear ratio 1: 5 to 1 Answer: 45 to 1

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