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by jweather
3085 days ago
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This is a similar concept to the odd numbers of teeth used in gear chains. If you had an 8-tooth and a 16-tooth gear, they will wear unevenly as the same teeth (with potential manufacturing defects) always meet the same teeth. If you change that to 7-tooth and 17-tooth, they will only repeat pairings every 119 teeth and wear will be distributed evenly across all teeth. In general, tooth numbers that are relatively prime (sharing no divisors) are preferred. |
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