Instructables
Picture of Handy 5-second Belt Repair
This works really well on small toothed belts.

I built a roller for my maslab robot out of scrapped printer parts, but the belt went missing. I borrowed one from another team, but it was about an inch too long.

So what do you do?
 
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Step 1: The Answer!

Heat shrink tubing! Hooray!

I added a daub of hot glue to the smooth side of both belts first.
Then I slipped a bit of heat shrink around, and hair-blow-dried that belt like I was a stylist at a posh salon in New York.

It works really well! It acts just like a continuous belt, goes around the gears just fine, doesn't seem to have any elasticity or want to pull apart.

Also, the heat shrink tube goes all the way around the belt, and grabs the teeth, so it's better than any glue solution (and it's compatible).
zack2474 years ago
could this work on really small-ish gears? like in radio controlled car gearboxes?
zencoder5 years ago
Cool idea, my heat shrink never gets used up so now another way to use. Mostly I use it for quick change of polarities on AC to DC adapters, who needs solder.
Patrik6 years ago
Hey - what's on the rest of that Squid Labs T-shirt? Haven't seen those before... Cute idea on the belt splice. Not sure it would work with belts that are much smaller than that though. Hmm... since I called it a "splice" - I guess an alternative might be to cut the belt on a long diagonal, so you have a much larger gluing surface. That would sure be a lot more finicky than your solution though.
stasterisk (author)  Patrik6 years ago
That's a good idea, and many funkier cuts have been suggested. I did it in 5 seconds, as the title indicates, so I measured roughly with my fingers, cut so that a tooth and a groove would butt, and then heat shrunk them like I wanted them to be siamese twins. T3h_Muffinator posted images of the squid labs shirt a while ago. Man, you guys are observant! Here's the whole thing:
F42CZJBF5R8MRKS.jpg
Did the interns really get Glocks?
Any cutting of the belt will make it shorter. If it does not fit it id ng even if not broken. Plan ahead a shorter belt might work. Overall idea of using hs tube is great. I assume it has to shrink enough to form teeth?
8bit5 years ago
I wouldn't have thought that would work. I'll have to give it a try!
Cool! I like your Squid Labs shirt.