Chain Tensioning

[thefro526]

Originally Posted by artdutra04

Even simpler than spring-loaded tensioners: floating idler sprockets.

Back in 2008 we had problems with the drive chain slipping for our elevator under load. It was in such a weird spot that any conventional tensioner would've either hit our frame or rubbed on the ground. So, I figured, what the heck, let's try a floating idler. And it worked, it make it the entire season without any issues. (Except once - we almost tipped the robot over pushing the limit in some pre-ship practice and the force must've popped the sprocket out...)

Also, we used these guys on our '05 robot: http://www.mcmaster.com/#6233k33/=6iqpvw

I really don't like them because I don't feel that they tensioned the chain all that well, but it also wasn't the best chain routing, so these may work too.

Something else we use on 816 is adjustable transmission mounts. Every robot we've built since 2006 has had one in some form or another. This year, the transmissions are mounted on 1/4-20 threaded rod which allows them to move up and down to tension if needed.