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Re: Cause of chain ratcheting issues
Brian,
Couldn't tell from the close up shots, but looking at your robot picture on the BlueAlliance it definitely looks like your frame could easily flex under load and change c-to-c distance.
The idler sprocket at the top of the lower stage appears to be mounted on u-frame bolted to the sides of the base stage. It only has to pivot a fraction of an inch under load to cause issues.
David
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