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Originally Posted by lukevanoort
What sort of bearings have your teams used? Has anybody used synthetic sapphire? Or, some of those crazy high rpm air bearings?
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No need for stuff that fancy. Conventional ball bearings will easily handle anything that a FIRST robot is likely to throw at them in terms of radial load; ABEC-3 precision ought to be more than enough. Also, consider conventional sleeve bearings for slow-running or low-precision mechanisms.
Though an air bearing might work, you'd want to be wary of the pneumatic system rules; it's very possible that those won't be allowed, since they're difficult to define as a "pneumatic fitting". In any case, they're not a good solution given the limited air capacity of the robots.