Which does your team use polycord or eurathane belts?

[OccamzRazor]

To answer your question, we used probably 60 ft of urethane belting from McMaster Carr and used a heat gun to mesh them together. After that we used a belt sander(disk type) to remove the lip where they were joined which really helps them to last longer on the robot. We use them to transmit power as well as pick up balls and have had no failures recorded with them.

[pfreivald]

We used .25" surgical tubing for our belts. To connect the ends we used about two inches of very small round urethane belting (solid) that barely fit inside the tubing (you had to roll it on to get it to stay). That and some superglue = we "broke" two very cheap belts over the course of two regionals, and can fix them in a matter of (literally) seconds.

[Billfred]

I'll avoid beating the dead horse (glue is too cheap), and say this:

We used 3/16" solid-core round belts, clear (because orange would be mild heresy thanks to our USC sponsorship), welded with a lighter in a jig made from scraps. We've had some jump their pulleys (not unexpected due to the nature of our robot), but none have broken.