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Diaphragm vs. Piston

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Modderxtrordanare » Mon Jul 02, 2007 2:13 pm

chaos wrote:what about those flotation pool noodle thingies? they might be 3" tho


Those are porus and air will leak through them. (very slowly)
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Unread postAuthor: rednecktatertosser » Mon Jul 02, 2007 2:20 pm

I think he meant to fll the piston with foam, not to use as a piston
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Unread postAuthor: Gepard » Mon Jul 02, 2007 2:26 pm

I think he meant as a bumper.....

Michael
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Unread postAuthor: Modderxtrordanare » Mon Jul 02, 2007 2:26 pm

Then why not just use some of that expanding foam in a can? Like GreatStuff or something. :?:


Edit: For a bumper? You could fold over a short piece of hose and stick that in the back. It would work just as well. Or you could still use expanding foam. :lol:
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Unread postAuthor: rednecktatertosser » Mon Jul 02, 2007 2:28 pm

I brobably cause that expanding foam will be wasted by getting played with :D , not so much with the pool noodles.
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Unread postAuthor: schismatized » Mon Jul 02, 2007 3:02 pm

i think that expando foam would be great as a bumper. ill have to try that :)
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Unread postAuthor: Gepard » Mon Jul 02, 2007 3:28 pm

Not too sure. Generally once it's squashed it doesn't expand back and stays solid....

Michael
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Unread postAuthor: Pyro Ninja » Mon Jul 02, 2007 7:37 pm

Just one question: can I use bike tyre tube for a 15mm diaphragm coaxial?
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Unread postAuthor: hi » Mon Jul 02, 2007 7:55 pm

Pyro Ninja wrote:Just one question: can I use bike tyre tube for a 15mm diaphragm coaxial?




yes, but it would be better to find some thing thicker. if you do it would probably be best to put it between a union. thats my opinion.
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Unread postAuthor: schismatized » Mon Jul 02, 2007 8:15 pm

Gepard wrote:Not too sure. Generally once it's squashed it doesn't expand back and stays solid....

Michael


this occurred to me.. i guess my search for a bumper continues. :?
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Unread postAuthor: hi » Mon Jul 02, 2007 8:31 pm

i guess my search for a bumper continues.


just cut one off a car you idiot. just kidding :lol:

maybe a couple of half tennis balls would do, but im not sure.
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Unread postAuthor: noname » Mon Jul 02, 2007 11:02 pm

Pyro Ninja, it's very likely that it will pop. Use some thick sheet rubber.
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Unread postAuthor: Modderxtrordanare » Tue Jul 03, 2007 12:51 am

schismatized wrote:
Gepard wrote:Not too sure. Generally once it's squashed it doesn't expand back and stays solid....

Michael


this occurred to me.. i guess my search for a bumper continues. :?


If you "obtain" one that fits on a 1987 chevy pick-up, PM me. :wink:

kidding.


Edit: We filled up a bottle full of the GreatStuff foam, and when it cured completely, we could squish it and it would form back to its shape. I see no reason not to atleast try using it. It will still after all impart some of the forces contacting the piston's rear and still serve its purpose as a bumper just fine. :)
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Unread postAuthor: schismatized » Tue Jul 03, 2007 1:03 am

i actually found a chunk of gum rubber in my garage. i think once i cut it down it will work good.
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Unread postAuthor: chaos » Tue Jul 03, 2007 2:26 am

just to clear up my last post... yer i ment use a foam noodle as a bumper, they do compress and re-expand, and a whole noodle is like $3
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