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pressurizing my pneumatic

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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pressurizing my pneumatic

Unread postAuthor: pizlo » Tue Dec 26, 2006 6:00 pm

Well i got my first pneumatic gun glued a couple of days ago, i have a design mostly like killas tutorial. the first thing i did was try to get some pressure with my hand bike pump... and my gauge showed nothing, I knew i had pressure because i could get a 1in core of a spud about 30 ft. after trying a 12 volt car tire inflater for about 2 minutes i got the same results. after i checked for a leak and found one around my valve. i sealed this up with some gorilla glue witch is now airtight. but I cannot seem to get my psi above 10 or it would show on my gauge. what should i use to get the psi to at least 60? thanks.
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Unread postAuthor: Pete Zaria » Tue Dec 26, 2006 6:03 pm

Assuming you don't have any electronics (Such as a solenoid) on your gun, I say pump it up as high as you can currently get it, and leak test it underwater in your bath tub. I'm suspecting you have a leak somewhere.

What kind of valve do you have? If you have a diaphragm or piston, you may need to check the seal and/or lubricate it.

Give us more info.

Peace,
Pete Zaria.
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Unread postAuthor: jrrdw » Tue Dec 26, 2006 6:36 pm

I think you should pump it up again, and tap on your pressure guage with your finger. Your probly getting a false reading.
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Unread postAuthor: pizlo » Tue Dec 26, 2006 9:36 pm

yea i tried tapping the gauge and nothing, i am using a pvc ball valve any ideas on what i should use to inflate it my bike pump is not great but it does my bike tires just fine
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Unread postAuthor: Bluetooth » Tue Dec 26, 2006 9:38 pm

Your either very very weak or your bike pump is messed up. Go buy a compressor and rebuild you cannon so you can use it :lol: .
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Unread postAuthor: Insomniac » Tue Dec 26, 2006 9:46 pm

Maybe your gauge is busted????
Buy a cheap guage that you just fit on the schrader to get the pressure ( you can get them at bike shops) and see if the gun is holding pressure.
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Unread postAuthor: frankrede » Wed Dec 27, 2006 2:41 am

yest your guage on your bike tire, if it shows no pressure then your pump is fine.
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Unread postAuthor: experament-u2 » Wed Dec 27, 2006 3:23 am

i think ure psi guage is buggered just by a hole new pump or borow one and test it
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Unread postAuthor: killagorrila99 » Wed Dec 27, 2006 3:30 am

like killas tutorial


Can I see some pics. I'm proud of my tut.
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Unread postAuthor: mark.f » Wed Dec 27, 2006 7:13 am

Sounds to me like it's a problem with your Schrader, (tire), valve. They do that to me occasionally. They get up to a certain pressure and then disconnect. I don't know for sure, but you may want to check that.
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Unread postAuthor: pizlo » Wed Dec 27, 2006 10:23 am

i can post some pics later (by the way killer i liked your tut, i used 1 in pipe for the barrel instead of 3/4.) the gauge is 0-300 psi, and is 1/4 in thread, its screwed into a a threaded metal reducer,which is screwed into a 1/2 in threaded pvc reducer, all these i screwed in with Teflon tape the correct way. I know i had a little leak around my tire valve,(i got it up to pressure then painted all the joints with soppy water.) I "fixed" this by pushing the valve part way in a applying some gorilla glue, i also put some around the outside. once this dried it stopped the leak , i also put some duct tape over it in case there was a very minor leak. my uncle told me that a gauge that goes in ticks of 10 psi might not move unless it reaches 10psi, i might have not reached 10 for some reason, because i could only get the spud core about 30 ft.
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