which two things did the idler made for the girl?
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its because there is bi-directional (2 direction) force loading vs driving gears having one directional force loading. the load of an idler gear changes direction on the tooth face when it is being driven, meaning the strain reverses, leading to significantly more wear.
its like bending a metal rod one direction then the opposite direction. it will cause failure faster than bending it one direction.
Hope you Understand..
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