Chain Tension-er?

[MisterG]

We found that flexible sprocket device too and I was wondering if something like that could be 3D printed out of some material that would give a similar effect. Anyone have thoughts about this?

Also from my reading it seems like tensioning addresses at least two separate factors. The first is making the chain the correct length for the application. This can also be solved with careful design and manufacturing. The second is compensating for chain stretch. Which of these sounds like the bigger factor for an application like a drive train?

[Breadbocks]

I suspect if you could get it to print right with the proper spacing, ABS would have enough flex without being too squishy or too rigid. The trick is getting it right.

As far as spacing, the only actual problem is length, which chain stretch contributes to. The three options are 1. ignore it, 2. tension it, 3. have some way to move a sprocket around so you can move it back when chain stretch.

[Nirnaeth]

We've used this product from McMaster every year.

Expensive, but totally worth it.

http://www.mcmaster.com/#chain-tensioners/=10yrv27

[Joe Johnson]

Originally Posted by Nirnaeth

We've used this product from McMaster every year.

Expensive, but totally worth it.

http://www.mcmaster.com/#chain-tensioners/=10yrv27

Counter point.

Build your own. It's not that hard and it is totally worth it. ;-)

Dr. Joe J.

P.S. Serious. Designing chain tensioning into your robot is just a skill that FIRST teams should acquire and then nurture and grow. It is a core skill that makes your robot SO MUCH more reliable if you do it right. Learn it. Love it. Pass it on before you graduate. JJ

[artdutra04]

Originally Posted by Massako

lol thanks. i dont know how well this would work on a drive train but we can defiantly try it.

When I was on 228 in 2011, we used CNC milled polycarbonate floating idlers to tension the 25-pitch roller chain in the drive train. They never fell out, but had to be adjusted a few times early on as the chain 'stretched'.

I don't have any photos of the 2011 drive train usage, but I do have one available from when I first used them in 2009. We used the same style polycarbonate floating idlers in 2011.

[Taylor]

For a nice history lesson, research how WCP got its start. linky