How to attach a metal hook to a timing belt.

[PyroKnight]

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.

[nnfuller]

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?

[PyroKnight]

Originally Posted by nnfuller

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.

[DonRotolo]

Perhaps a pop rivet would work

[Kevin Sevcik]

Originally Posted by DonRotolo

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.

[mdiradoorian]

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.

[Aroki]

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

[mdiradoorian]

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.

[Aroki]

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:
1. Conveyor belt under the magazine made from surgical tubing or timing belts (with the teeth pointing outwards).
2. A motor with a bar that rotates around and each time pushes out the bottom frisbee into the shooter
3. A piston behind the magazine that pushes the frisbees out into the shooter

[mdiradoorian]

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.

[DonRotolo]

Originally Posted by mdiradoorian

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.

Yes, of course, there is no way to modify the rivet head to make this work. Silly me.

[JesseK]

Originally Posted by Aroki

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

Silly silly silly. This paragraph is wrought with ill-conceived notions of this game.

A robot which sacrifices a complex hanger in lieu of a good autonomous which nets the 4 floor discs into the high goal is more valuable than a robot which sacrifices floor pickup for a 30-point hang. (24-pt auton from floor + 10-pt hang > 30-pt hang). That said, a 6-7 disc autonomous is just as hard (IMO) as a 30-point hang, and only one robot on an alliance is eligible to pickup 4 discs in a single auton. Yet the point is that there's a very good case for pickup from the floor for 2 robots on an alliance.

There's also good discussion about whether there will even BE any upside-down discs.

(edit -- sorry for the thread hijack -- the OP should keep trying with their floor pickup endeavors, IMO)

[RRLedford]

Originally Posted by PyroKnight

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.

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.

Example: glue mounted indoor speed skates -


-Dick Ledford

[mdiradoorian]

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?

[Jeffy]

Originally Posted by RRLedford

Shoe Goo urethane...

+1. Or I found a glue called "E6000". I think it might have a bit more strength, but stays flexible too.