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Originally Posted by Crazy
...One thing I'm unlcear on is how are the idle gears kept in place? It seems to me that you could only put spacers on the outside of the gears beacuse the dog in between would make retaining them on the inside impossible...If the red is hex shaft, how is it inserted into the bearings in the middle of the shaft? I'm assuming even if those sections are lathed, it would be impossible to move the part of the shaft that is still hexagonal through the bearing.
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Look at the cutaway view and notice that the output shaft only has the hexagonal shape where the dog rides on it. The rest of the shaft on either side is a standard cylinder. That answers both your questions. The bearings are put on the normal cylindrical sections, and the thicker hexagonal section keeps the gears from sliding toward the middle.