Hi, our team is trying to attach a type of hook on to a timing belt without using glue (in our testing it proved too weak). It needs to be able to go around the belt as this will be constantly revolving around and pushing frisbees but it cannot be fastened from the bottom. We’d appreciate any suggestions, thank you.
Do you need to use timing belts? Have you considered alternatives? I know for a while my team was considering these and #35 chain http://www.mcmaster.com/#catalog/118/1036/=l08izr
heavier yes, but far more robust. Anyone else have any ideas?
This looks interesting, definitely a consideration, more ideas along these lines wouldn’t be bad. Thanks for the suggestion.
Perhaps a pop rivet would work
If all your pulleys are big enough that a pop rivet head won’t throw your belt, I can see that working. You definitely want the head on the toothed side of the belt, though.
Guys you can’t use a pop rivet on a timing belt considering that there are grooves on the inside of the belt to the pulleys. I like the idea with the chain because it does not break and is a rigid structure.
Could you explain what the timing belt-hook with be used for? It’s a bit challenging to suggest solutions without any idea of the constraints
It would be used for a floor pickup mechanism. It would be after the floor pickup to the magazine. Also it would be used from the magazine to the shooter.
I would avoid floor pickup, (in my opinion at least) the advantage of being able to pick up from the floor is less than the difficulty of designing a mechanism that picks up and can also orient the frisbees, and the time spent doing that would be better spent making a good climber and/or a reliable shooter/loader robot. This also removes the need for a floor pickup to magazine mechanism
In regards to the magazine to shooter, I’d suggest:
- Conveyor belt under the magazine made from surgical tubing or timing belts (with the teeth pointing outwards).
- A motor with a bar that rotates around and each time pushes out the bottom frisbee into the shooter
- A piston behind the magazine that pushes the frisbees out into the shooter
We actually do have a system on orienting the discs, however when still need to figure out how the discs will move with our system. The chain idea i so far the better option Thanks nnfuller.
Yes, of course, there is no way to modify the rivet head to make this work. Silly me.
Shoe Goo urethane adhesive will hold the hooks on, as long as you give it time to fully cure 48 hours. It has super tenacious grip and very high peel strength.
It also remains flexible after curing. so it can handle the flex of going around the pulleys, as long as they aren’t super small dia.
If you want a thick coat, put it on in two applications, allowing 1st one 24 hours cure time before applying the second. If laid on too thickly. lowest level curing gets delayed from so much more piled on top of it. It cures by out-gassing volatiles, so keep in a well ventilated area during curing.
To check if it’s done curing, just smell it. Stink means not done yet.
Sticks to most everything, as long as surface is fully cleaned.
Best all around glue you can buy.
I build custom roller skates gluing the skate plates onto carbonfibre reinforced soles of athletic shoes (no screws), and have skated one outdoor pair for 13 years with no glue joint separation.
By having this glue on the timing belt wouldn’t it break off the belt considering the repetitious bend when it comes to the pulley?
+1. Or I found a glue called “E6000”. I think it might have a bit more strength, but stays flexible too.
If you still like belts, what’s stopping you from grooving the pulley to allow a fastener to pass through? All it takes is a lathe and a little patience. You shouldn’t need the full width of the pulley to grip the belt if it is just lifting the weight of a frisbee.
Here is the link for the glue and thank you http://www.michaels.com/E-6000®/gc0181,default,pd.html
that is true, however I want a system to be simple, easy to make and easy to repair if it breaks.
What isn’t simple to make? If you have access to a lathe, simply chuck up a pulley and turn a groove. If you don’t, a student can achieve the same results (although a little less pretty) with a file and some spare time.
What isn’t simple to repair? You would effectively cut the teeth off the pulley in the center. So if you used a fastener with a .25 head on it, cut a quarter inch groove in the middle of the pulley teeth. The only thing that might fail would be a fastener and those are pretty easy to come by.
Oh by the way putting a fastener in the middle of a timing belt would increase the chances of of the belt breaking even if i were to make a groove in the middle of the pulley. The reason how I know is that I have tried. By having a belt you need tension and tension stretches to belt and when you stretch the belt with a hole in the middle of it increases the chances of it tearing.
A belt tearing is very dependent on the stress levels we are talking about. I’d hope hat there aren’t a lot of forces involved in a frisbee conveyor, otherwise I would question the overall design.
An alternative to lathing a slot in the pulley would be to obtain a non-flanged pulley whose width is smaller than the belt width. You could then fasten the hooks to the edges of the belts. You would, however, have to consider how to keep the belt centered on that non-flanged pulley.