diaghram wont seal

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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jon_89
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i just finished my coaxial and the air goes right through the barrel. what is the problem?
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Novacastrian
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The barrel is not sealing. What are you using for the sealing face?
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jon_89
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it is diaghram valve. i am using sheet rubber
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mopherman
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Are you filling from behind the 'phram? how far is your barrel from the 'phram when uncharged?
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MrCrowley
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Hmm, PM a member called 'noname', he is somewhat of a diaphragm expert. Though I can't see why it wouldn't work.
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spudgunnerwryyyyy
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How thick is the rubber, noname should help, umm how much pressure did you apply? Is the barrel perfectly flat.
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MrCrowley
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What are you pumping the gun with? How big is the chamber? How is the 'phragm held in place? Is it flexible enough? Is it a good sealing material?
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jon_89
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filling from behind, tried different distances, no pressure cause it leaks through the barrel.
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knappengineering
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What are you using to fill it, it sounds like it may not be getting the air it needs to seal quickly enough, or your equalization hole could be too big.
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SpudUke5
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What do you fill it with and via? CO2? Schrader? HPA tank? Compressor?

And how abour Pics?
Last edited by SpudUke5 on Mon Nov 05, 2007 11:12 pm, edited 1 time in total.
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spudgunnerwryyyyy
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You need lots of air flow to get it to seal. like a continuous flow of 25psi from a compressor.
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knappengineering
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In addition to what spudgunner said, a bike pump probably wouldn't cut it for this gun, you need a compressor or CO2 or something similar. :wink:
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spudgunnerwryyyyy
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spudgunnerwryyyyy wrote:You need lots of air flow to get it to seal. like a continuous flow of 25psi from a compressor.
I already said compressor.

How close is the phram in size to the id of the pipe. Get the gap really small. like under a millimeter
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SpudUke5
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I have that problem with sealing my piston valve because there is not enough flow ever since i added that bumper to my piston. What i do now to seal it is begin to fill via schrader, i have to shut the ball valve between the schrader and the brass tee connected to the back of the tee. I have to shut the ball valve and build up pressure, then release it causing that burst of pressure to seal the piston to the barrel. So it still works which i am happy with for now. :D
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Fix up copper cannon
Fix up 4SPC
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Start Toolies piston bazooka
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Tom
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From what kind of rubber is the diaghram made?
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