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Originally Posted by Lil' Lavery
How close are those top CIM mounting screws to the upper wall of the tubing? Are you having to remove wall material to thread those screws in? Would you if you increased to 1/8" wall tubing?
What's the clearance between those same CIM mounting screws and the cluster gear?
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There's 2 sets of answers, for the 2x1 gearbox and the newer 3x1 gearbox. For the 3x1 gearbox, the clearances are huge (more than the diameter of the screw) and there is definitely no problem. For the 2x1 gearbox, it's a lot tighter. The CIM mounting screws are .01" from the wall, and in theory no wall material will be removed. The CIM mounting screws are .0125" from the gear. The tight spaces are another reason to use 3x1.
If I use 2x1x1/8, the CIM mounting holes and the output bearing hole will cut the wall there down to 1/16 anyways, so I figured there wasn't much of a difference. Using a 3x1 is much safer all around anyways.
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It appears to me the hole on the CIM side of the tubing is sized to pilot the boss, and the 14T pinions are to be installed via the hole on the opposite side of the tubing once the CIMs are already screwed in.
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Correct, except that I am using 11t pinions, so there is no problem anyhow.
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What retains the output shaft from shifting?
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The output shaft is turned down to a circle on the back end to prevent it from moving backwards. The circle extends past the bearing and a shaft collar holds it on the other side. It's shown in the render in the link in my previous post. This setup allows me to remove the output shaft by removing only a shaft collar.