Quote:
Originally Posted by Wildcats1378
Hey great video series guys. It was really informative and well done
I do have one design question though. We struggled last year with a somewhat similar roller system, but we used rubber bands. They would constantly move left and right and get all messed up. What is poly cord and how do you keep them from floating all over the place?
Thanks 
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Poly cord is sold on mcmaster by the name urethane belt. Some teams use the round belt and some use the flat belt. Basically, you buy the polycord and install by cutting the belting to length(a little short so that you get tension on your belts) and weld the two sides together with heat(we have a polycord welding set, but it's really not needed. I've heard of a flame or a soldering iron working well). Our team used the round belt for 2012. We machined pulleys out of ABS to make sure that the belt wouldn't move. Many other teams have similar or the same way of keeping it in place. I've also heard good things about flat belt from teams like 341. Apparently if you wrap your shafts in electrical tape where you want your belts to stay the belts will actually walk back to their places if they get moved.