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Re: Dual CIMs and #25 Chain
I would bet that your problem is chain tension, either too tight or too loose. Many many teams use 2 cims and #25 chain on each side with no issue.
Story time: In the past, we used to build H frame modules that consisted of an H shaped piece of welded aluminum (with 2 cross pieces), a gearbox, and 3 dead axles wheels. They were a nightmare for a couple of reasons. One was that they were warped severely during welding, bent outwards, and then occasionally cut up and rewelded. It was awful. Our chain wasn't even remotely close to tight due to incorrect center to center distancing, made worse by warping and horizontal misalignment, and compounded by chain stretching. We put delrin blocks all over the place to tension the chain, but it ended up following a serpentine path, tight on one side of the sprocket and loose on the other, was really inefficient from all the rubbing, and liked to break. We did this for years and years, with the same results, more or less. So in planning for this year, you wouldn't believe how hard it was to get the drivetrain crew to build a fairly standard west coast drive. They were absolutely terrified of the chain breaking every match, citing the H frames breaking chain in the past. But we pressed on, built the WCD, and we didn't have a single problem with it.
We also managed to break 9 drive axles one year (which we solved by removing a CIM), but that's a different issue.
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