Pneumatic Tubing

[kapolavery]

so i read the whole part about melting the polycord together with a lighter

and i was wondering whether it would work the same using pneumatic tubing

thanks!

[Anders Horn]

I do not think so, try testing.

[AdamHeard]

I know 1622 used pneumatic tubing as their belts, I suspect they connected with barbs that were inserted that hold the ends together, but may be wrong.

I'd send them a message.

[kapolavery]

how can i get a hold them?

[EricH]

Originally Posted by kapolavery

how can i get a hold them?

I can think of a couple of ways...

1) Go to the FIRST website. 1622 is based in Poway, CA and attended San Diego and Las Vegas. Searching through the map icon or going through the regional list will get you a team info page, with a link to their site. If they don't have contact info there, I will be extremely surprised.

2) Go to the CD member list and do an advanced search for team number 1622. With a little bit of care, you should be able to find the more active CD members and get a message to them.

[POWSpyder]

Yea we used barb fitting to connect our pneumatic tubing together for our conveyor, and they work great. I would recommend using this system over the poly cord because it is very easy to change/shorten if needed.

[MrForbes]

Originally Posted by EricH

I can think of a couple of ways...

3) wait a little while and they'll answer themselves

[kapolavery]

is it available say like at home depot or something that id have to order..
should i try plastic fittings or brass/metal fittings

and what size?



is this how they look like?

[kapolavery]

and btw
this is just for our side project.. being that our season is over..
our teacher wants us to build a robot with a "ball pick up" mechanism.
and improving our bot is what my grade depends on ahah
so itll be a fun last senior project

thanks guys for helping out!

[artdutra04]

Originally Posted by kapolavery

is it available say like at home depot or something that id have to order..
should i try plastic fittings or brass/metal fittings

and what size?



is this how they look like?

That's what a barbed fitting at Home Depot would look like if you were going to use the tubing to carry water or some other liquid. To get the barbs for making conveyor type belts, try someplace like McMaster:

http://www.mcmaster.com/#6567k22/=1a4azx or
http://www.mcmaster.com/#6567k65/=1a4b43

[kapolavery]

ok that helps..
but is it something that i have to order?

shipping stuff to hawaii takes a long time..
or is there a way to improvise using maybe.. short bolts..washers..glue even?
after all its not for competition but for my school project hehe
so just as long as the concept will work its fine.

[Daniel_LaFleur]

Originally Posted by Matt Howard

You cannot use heat to "weld" the pneumatic tubing, as the tubing actually expands with heat. But yes, we used barb fittings. The connection created is so strong, that another mentor and I pulled as hard as we could on a link we made, then gave had a student pull as well and only after about 2 minutes of straining we finally got it to pop open.

The joints created by the barbs are very strong.

Considering that I've heated polyurethane tubing to the point where it will bond with itself ... I'd say that you are incorrect here. I also agree with you that barbs are the way to go, for reasons I stated in my earlier post

Originally Posted by kapolavery

ok that helps..
but is it something that i have to order?

shipping stuff to hawaii takes a long time..
or is there a way to improvise using maybe.. short bolts..washers..glue even?
after all its not for competition but for my school project hehe
so just as long as the concept will work its fine.

If you want to experimant a bit:

Take a small piece of threadded rod (with the OD of the rod slightly larger than the ID of the tubing). Heat the tubing to get it soft enough to push over the ends of the rod. This should work, depending on the load you put on it. I'd also suggest you push the tubing so that the 2 ends meet in the center of the rod.

[Matt Howard]

Originally Posted by Daniel_LaFleur

Considering that I've heated polyurethane tubing to the point where it will bond with itself ... I'd say that you are incorrect here. I also agree with you that barbs are the way to go, for reasons I stated in my earlier post

We're going to have to agree to disagree on that point then, because when we did it the tube expanded and was unusable.

Originally Posted by kapolavery

ok that helps..
but is it something that i have to order?

shipping stuff to hawaii takes a long time..
or is there a way to improvise using maybe.. short bolts..washers..glue even?
after all its not for competition but for my school project hehe
so just as long as the concept will work its fine.

The barbs we used were from McMaster, and are brass. I cannot for the life of me remember the part # but I can find out for you.

Before we were using the barbs, to test the lift system we took #8's, cut the heads off and left about .5 inch, then pressed the ends of the tubes onto the remaining bit. We had pre-drilled the tubes about .70 inches away from where the #8 would be housed within the tube, and used small cable ties through the tubing to cinch it together.

It worked, but was really only a temporary solution in our eyes.

[Daniel_LaFleur]

Originally Posted by kapolavery

so i read the whole part about melting the polycord together with a lighter

and i was wondering whether it would work the same using pneumatic tubing

thanks!

If you are going to use it for pneumatics, the answer is NO. You will severely degrade the operating and burst pressure of the tube.

If you plan on using it for belting material, then yes it will work ... but the degraded strength of the joint may fail (IE when you melt polyurethane tubing it gets weaker but will bond together)

[Matt Howard]

Originally Posted by Daniel_LaFleur

If you are going to use it for pneumatics, the answer is NO. You will severely degrade the operating and burst pressure of the tube.

If you plan on using it for belting material, then yes it will work ... but the degraded strength of the joint may fail (IE when you melt polyurethane tubing it gets weaker but will bond together)

You cannot use heat to "weld" the pneumatic tubing, as the tubing actually expands with heat. But yes, we used barb fittings. The connection created is so strong, that another mentor and I pulled as hard as we could on a link we made, then gave had a student pull as well and only after about 2 minutes of straining we finally got it to pop open.

The joints created by the barbs are very strong.