Quote:
Originally Posted by Joe G.
Another consideration is, you don't necessarily have to support your shaft with your chassis rail. If your gearbox provides adequate support for your shaft by itself, you can just drill a clearance hole into the chassis, and let the gearbox's bearings do the work for you. It is almost never a good idea to support a shaft with more than two bearings, as this can cause binding.
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It is also almost never a good idea to place the load on an axle far away from its supports. This is just another trade off to be considered, depending on the width of you chassis rails, this might not be an issue. If the rails are wide enough, it might be worth your time to try to align the bearings so the shaft can be supported. In situations where machining capabilities are minimal, narrower rails without additional axle supports might be the best option.