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Originally Posted by Ben Piecuch
J...If you can engineer a way to fit two sprockets on the end of the output shaft, I'd be happy to hear about it. That would cancel out the side loading on the shaft...
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At first blush this seems to be true but in practice it is not. Basically, the load on the tires are not uniform so the traction forces are not equal.
Think of it this way, imagine a 4WD robot with its CG in the middle pushing against a wall. As the robot slowly hits the wall, the load on the tires is equal but the harder the robot pushes on the wall, the more load shifts to the rear wheels until the front wheels are effectively off the ground and the rear wheels take all the load.
There are good reason to put 2 sprockets on the output shaft of the drive more, but I think that cancelling out the side load on the shaft is not as strong of a reason as one might think.
Joe J.