Poly Cord

[Ian Curtis]

Originally Posted by Chris Fultz

We ordered ours from McMaster. It worked well. There are some guidelines on measurements and what to order and if you follow that it worked very well. (There is a recommended stretch).

The recommended stretch 10% is pretty overkill in my experience with the 3/8 solid. If you have more than three or four belts it takes a huge lever arm to get things to line up, and you take a huge performance hit from the all the friction in your bearings. We found 5% much easier to work with, and we even did 3% with no difficulties. (Though as a precaution we shipped the robot with the 3% belts removed so they didn't stretch over time)