Gears and Gear Ratios

2 years ago

16 Replies

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Antony

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With this setup of gears, would they all move at the same speed, or would 'A' have a lower RPM as it is larger?

Thinking about the number of teeth they have, they'd all move at the same RPM, or is that incorrect because of the size difference?

16 Answers

Doug Green

Without counting the numbers of teeth, if for example A had twice as many teeth as B, B would need to turn twice for every rotation of A; B would have twice the RPM of A. A similar idea would apply between B & C, such that you only need to look at the ratio of teeth between A and C to find the RPM of C ( B effectively 'cancels' out)

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