chain transmission without tensioning

[ajlapp]

We run #25 chain on theoretical center distance without tensioners all the time. Alignment is key. The chain wants to jump when the sprockets aren't axially aligned properly.

Placing these holes can be done with a manual mill. No particularly high tolerance process is required. +-0.005" will work all day long.

Example Chassis with untensioned #25 chain runs.

FRC118 ran this setup for 2013 with zero maintenance issues or chain failures.

[yash101]

Can't you spring-load a sprocket to do automatic tensioning? (or am I missing the point here?)

[EricH]

Originally Posted by yash101

Can't you spring-load a sprocket to do automatic tensioning? (or am I missing the point here?)

You're missing it--the point is that they don't want to use ANY tensioning if at all possible.


That said, I've seen folks just put a loose sprocket into their chain runs that need tensioning--best one I saw was a rubber one in the drive chain; ran back and forth as needed to get a good tension. Though I do second the Delrin recommendation. If you happen to be running the chain over structural members, stretch the chain over a block of Delrin on one of them, and let the chain dig in a bit until it finds its happy zone.