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Re: polyurethane tubing
We welded the solid orange polychord with a standard propane torch.
Just melt both ends that you want to connect
Place them in a piece of Angle Aluminum, with the two ends in contact.
Hold for 5-10 minutes till cool.
This resulted in a weld that was strong enough that two people doing tug-of-war could not rip it.
The welds might not be the prettiest, but they work amazingly, and don't jump off of our pulley's
If I remember correctly, the polychord on our bot had a tension of somewhere more than 30%. (I think I remember it being 35%, but I might be wrong.)
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