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Originally Posted by GeeTwo
While it's not a real answer, you can see that there are four screw heads around each wheel shaft. This implies that there are actual bearing blocks on the other side of each plate, which may be adjustable.
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Except the same four bolt pattern is present at the stationary, center wheel, implying a stationary block of some sort.
Quote:
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Every bearing is (or should be) mounted in a block, not a plate. There is no need for a bearing where the main drive shaft passes through the inner plate, as it is supported by a bearing in the motor mount plate at one end and a bearing block screwed to the outer plate at the other end.
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You don't need a bearing there (and having more than two bearings per shaft can be a pretty bad idea in general), but I don't see how this has much of anything to do with whether or not an integral versus separable gearbox is a good idea.