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Re: Recomended Cots gear boxes
Those are both good gearboxes.
You should consider that side loads due to chain tension, and to the shock of sudden reversals, will be transmitted from your sprocket to internals of the gearbox. The arrangement of bearings inside the Toughbox make it more robust against side loads than the P80. If you go with the P80, you should provide an external bearing block to support the end of its shaft; i.e, your sprocket goes between the gearbox and the external bearing block.
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Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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