Quote:
Originally Posted by TV Engineer
This is completely incorrect. The diameter of the idler is critical to correct rotational speed.
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This is true only in the case of a compound idler, ie., two different-sized wheels affixed to a common shaft. The diameter of a non-compound (single wheel) idler does not affect rotational speed, since the rim of the wheel is only a motion-transfer agent between the driving and driven surfaces (analogous to a fan belt). The length of the belt does not affect the speed relationship between the driving and driven pulleys.