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Connection Questions ... HURRY !!!

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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Connection Questions ... HURRY !!!

Unread postAuthor: Stifler69 » Wed Aug 13, 2008 1:54 am

Now i got a real problem, I'm in a sort of competition with a mate of mine to see who can come up with the best "Sniper Rifle".

I've got my design and everything but there's somethings that i need to know ....

1: I want to make the gun very portable so I'm proposing that i have two different Air Inlet Valves.
I already have a inlet valve for my Electric pump but if i want it to be portable i want to have a "Bike Pump or a Foot Pump" so if i don't have Electricity power around then i can manually do it ???
The problem is that I am working with metal so i don't know where or what to use for the other inlet valve ???
(Soz if that makes no sense at all haha)

Thanks for any help
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Unread postAuthor: trollhameran » Wed Aug 13, 2008 2:01 am

Use a shrader of a bike tyre, you ca get threaded ones that thread right in or just cut one of a tyre and glue it into a suitable size fitting with epoxy, that worked fine for me.
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Unread postAuthor: M.J.P. » Wed Aug 13, 2008 2:11 am

Yes a schrader valve is the way to go but if you want to get a threaded one you will probably have to get it off the net.

And your mate that your in competition with sounds like a real good bloke
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Unread postAuthor: Stifler69 » Wed Aug 13, 2008 2:12 am

ahhh thanks buddy, but all the normal car and bike tires that I've tried are either to small or like to hard to get all the rubber off ???
can u just like buy them out of a store or .....

cheers[/quote]
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Unread postAuthor: Stifler69 » Wed Aug 13, 2008 2:15 am

Mmmm know of any internet sites that sell them ???
(i really could find it myself lol)
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Unread postAuthor: trollhameran » Wed Aug 13, 2008 2:37 am

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Unread postAuthor: Killjoy » Wed Aug 13, 2008 2:55 am

Support bcarms if you can. But to be fair, [url]surpluscenter.com[/url] also sells them. Check the pneumatic section.

Ace hardware also has been reported to have them.
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Unread postAuthor: noob of noobs » Wed Aug 13, 2008 8:22 am

I confirm that my Ace has them. The come in sizes that thread onto 1/4" and 1/8" NPT fittings, and you can just connect those to a chamber using steel pipe fittings that will connect to your metal pieces.
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Unread postAuthor: Hubb » Wed Aug 13, 2008 8:46 am

They are located at most hardware stores near the air compressors and fittings. You won't find them near normal schrader valves.
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Unread postAuthor: stevenarroyo » Wed Aug 13, 2008 8:54 am

i just got back from ace hardware and they do have them (around $1.50 to $3.50)
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Unread postAuthor: TurboSuper » Wed Aug 13, 2008 9:33 am

They sell rubber ones for tubeless tires at almost any hardware/auto store, you can just pull the narrow end through the hole. They're self-sealing too.
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Unread postAuthor: mark.f » Wed Aug 13, 2008 4:49 pm

PROTIP: look in the "pump" section of your hardware store.
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Unread postAuthor: Stifler69 » Thu Aug 14, 2008 12:58 am

ahhh thanks so much to everyone,
Do they have an Ace hardware in Australia lol ???
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Unread postAuthor: starman » Thu Aug 14, 2008 1:05 am

Stifler69 wrote:ahhh thanks so much to everyone,
Do they have an Ace hardware in Australia lol ???


Just Google them and find out in seconds.
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Unread postAuthor: Hotwired » Thu Aug 14, 2008 8:29 am

Stifler69 wrote:ahhh thanks buddy, but all the normal car and bike tires that I've tried are either to small or like to hard to get all the rubber off ???
can u just like buy them out of a store or .....

cheers


I've used Presta valves to 240psi (limit of track pump) and Schrader valves to 400psi (limit of shock pump) using the same method:

You get a tyre and cut out the valve with a decent sized circle of rubber left around it.

You then get a compression fitting in a small size - 1/2" or 15mm down to 8mm is ok.

Get a steel washer with a hole that just allows the stem of the valve to pass through but stops the base and the circle of rubber from coming out too. The diameter of the washer has to be small enough to just fit into the NUT of the compression fitting, grind it down if it's a bit too big. If using a 8mm compression fitting you don't need a washer for Schrader valves.

Trim the rubber circle you left at the bottom of the valve until its the size of the washer.

Screw the compression fitting nut with the washer and valve onto the fitting.


There's other ways of doing it of course but that's the one I use.
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