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Please Help! pneumatic gun

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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Please Help! pneumatic gun

Unread postAuthor: pat123 » Thu Jun 28, 2007 3:25 pm

I just made my first pneumatic gun. I tried using a valve from my moms old car tire to fill up the chamber i used silicone sealant and i tried teflon tape and air still leaks around it. when i pump up the chamber the modded sprinkler honks while air is leaking around the schrader valve

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I was thinking about going to buy a new schrader valve instead of using the old one. could the sprinkler valve be honking because the air is coming in to slow?
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Unread postAuthor: potatoflinger » Thu Jun 28, 2007 4:01 pm

The valve is probably honking because the air is coming in too slow, so you can add a cheap ball valve between the sprinkler valve and the air chamber, that way you can fill up the chamber with the ball valve closed, then open the ball valve to let the air into the valve.
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Unread postAuthor: pat123 » Thu Jun 28, 2007 4:06 pm

thanks
I will see if my mom will bring me to get one tonight how do you seal the schrader valve in the gun?
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sorry it is blurry
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Unread postAuthor: praetorian91 » Thu Jun 28, 2007 4:08 pm

Just drill a hole, and pop it in. Add some epoxy if you so desire.
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Unread postAuthor: pat123 » Thu Jun 28, 2007 4:10 pm

i tried but it still leaks around it
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Unread postAuthor: praetorian91 » Thu Jun 28, 2007 4:13 pm

Hmmm... I had the same problem on my first cannon. Did you epoxy it or just pop it in? Is your hole perfectly round?
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Unread postAuthor: pat123 » Thu Jun 28, 2007 4:22 pm

i tried epoxy and just popping it in. I just looked at the gun and the hole is not completly round. I am about to go to lowes to get a ball valve and a new schrader and endcap
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Unread postAuthor: spudbud101 » Thu Jun 28, 2007 6:26 pm

Go to Pepboy's Auto and they have valves in a 3 pack for 5 dollars. The valves don't need to be glued, just drill a hole and tighten the nut. It comes with rubber disks to seal. :)
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Unread postAuthor: Kenny_McCormic » Thu Jun 28, 2007 6:59 pm

that valve isnt all there its supposed to have a big fat end
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Unread postAuthor: Flying_Salt » Thu Jun 28, 2007 7:05 pm

That valve looks like it's missing the fat rubber part that goes on the end. Auto repair shops that specialize in tires, such as pep boys should have those for sale cheaply. They're very easy to mount if you know what you're doing.

The one you can can be used, just drill a hole slightly smaller than the rubber neck and pull it though (it should be a really tight fit). It will pretty much make a seal around itself, but you can reinforce it with blue tac or something.
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Unread postAuthor: jrrdw » Thu Jun 28, 2007 9:21 pm

In simple terms:

It's sapossed to be a 11/64ths" diameter hole. Look at a new tire valve stem, theres a big thick round bottem, a grove, then a taper to a neck with a shreader valve/valve core on the inside, with threads on the outside for the cap. It gets installed from the inside out. Pull the valve stem through the hole untill the grove then stop. No sealent needed, drill a clean straight hole, litely sand off any burs/twistys.
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Unread postAuthor: From_Hamsterdam » Thu Jun 28, 2007 10:22 pm

If it is only a small leak you could use super glue.
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Unread postAuthor: Flying_Salt » Thu Jun 28, 2007 10:32 pm

From_Hamsterdam wrote:If it is only a small leak you could use super glue.


Or you could just JB Weld it.
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Unread postAuthor: PVC Arsenal 17 » Thu Jun 28, 2007 10:35 pm

No super glue. Yes JB Weld.
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Unread postAuthor: spud yeti » Fri Jun 29, 2007 2:07 pm

Ja, JB weld it. And next time leave so of the tube at the bottom because it helps seal it.
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