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Small coaxial

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: rixth » Mon Oct 29, 2007 2:00 am

Negative
(msg to short)
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 29, 2007 2:12 am

that might be your problem then. Find a washer that is slightly smaller than the inner diameter of your barrel and fit in place, see if that helps.
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Unread postAuthor: rixth » Mon Oct 29, 2007 2:23 am

I'll see what I can do tomorrw (it's dark now).

What function does the washer hold?
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 29, 2007 2:51 am

Without the washer, air can get between the sealing face and the piston body, with the result that the face is "sucked in" to the barrel and starts to leak above a certain pressure.
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Unread postAuthor: MrCrowley » Mon Oct 29, 2007 1:35 pm

If it still leaks after that, air could be leaking through the piston and out where the bolt head holds the washer in place, epoxy that up if necassary.
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Unread postAuthor: rixth » Mon Oct 29, 2007 7:25 pm

I tried filing the piston to make it fit in the pipe, it does but the seal still ain't flash, plus I have to manually press the piston up against the barrel every time. I think I might sleeve a bit of PVC in there, just so I can get smooth sides then make the piston in that...
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