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Originally Posted by kiracofe8
Well, the easiest thing to do is to support the shaft by two bearings that are spaced a good distance apart. Then, instead of one bearing that has to take a large moment, you have two bearings that each have to take a small force. This is the principle behind why doors always have (at least) two hinges. If you only had one hinge, it would have to take a tremendous moment. But if you have two hinges about 6 feet apart, each only has to support a few pounds of radial load.
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Well, I should I have mentioned that I plan to support the shaft with two bearings. Despite that, because of its design and application, the load that the arm exerts (~200 ft.*lbf.) must be cantilevered off the shaft. I can't support the shaft above and below the arm, only in two places below the arm. The separation of the bearing was planned to be only about 4", but I can investigate increasing that distance to something larger; maybe as high as 12".
Kevin -- I'll look into angular contact bearings. I'd never heard of them until now, so I don't know what they're typically used for, nor do I understand how they work
Thanks for pointing out their existence.