Quote:
Originally Posted by Alan Anderson
. Usually it's the two right side motors that need to be inverted.
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Which ones need to be inverted depends on the number of stages in your gearbox; each stage reverses the rotation direction.
The reason that only one side needs to be inverted is that the motors themselves have opposite orientations. A clockwise shaft rotation (viewed from the motor side) is forward on the left and reverse on the right for no gearbox or a spur gearbox with an even number of stages.