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Re: Dual CIMs and #25 Chain
The dual CIM's didn't fail... your chain and sprocket failed.
Had you switched to #35 chain and sprockets... well... who knows what could have happened. We used #35 chain and aluminum sprockets for years and never had a problem. In fact our Breakaway 'bot, with dual cims and a 14:1 gear ratio, just spent two days of continuous driving doing demonstrations, has given "robot rides" to people weighing well in excess of 200 lbs, and can still climb ramps in excess of 45 degrees. The chain and sprockets show no signs of wear.
However... looking forward... use the largest sprockets that you can. The larger the sprocket the less the load in the chain, and the more teeth on the sprocket to transfer the load.
Also consider always having one wheel on each side direct drive. Get the extended shaft for the toughbox, and the keyed mounts for a wheel, and bolt that wheel to your gearbox's output shaft. No matter what happens to your chains you'll still be able to move. Our drivetrains have been 100% reliable since we shifted to direct drive.
Jason
P.S. Our drivetrains have been 100% reliable... but during Lunacy we had an unexplained control system breakdown in the quarter finals at Seattle... which adversely affected our alliance, captained by a then rookie team 2898. It was an awful way to end the weekend... little did I know what it would take to get someone to investigate FMS reliability issues.....
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