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Never weld it.....
If you know you have enough time to make extra parts then I would say weld it but.... If not use a keyway and a key. We welded our two gears together and really sucked when half the teeth broke off of one of the gears. We had to sacrafice another transmission off the robot and lose that other transmission's arm function.
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The influence of many leads to the individuality of one. - E.C.C. (That's me!!)
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