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Mounting a pressure gauge, NEED HELP!

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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Mounting a pressure gauge, NEED HELP!

Unread postAuthor: cash68 » Sun Apr 29, 2007 7:21 pm

Hi, I bought a 0-500PSi pressure gauge from American Science and Surplus for $2.75, it says "Cyl. Press." on it, black metal frame , looks very world war 2-ish. I like! However, it has 1/4 NPT threads on the back, and I'm wondering how the HELL I could hook this thing up to the chamber on my PVC sniper rifle. If I can't, I won't.... however, this project is DUE tuesday night, and so far I've checked home depot and lowe's with no luck. I'd prefer a 4-6" braided metal hose of some sort, and hook the hose up to the pressure chamber, and then ziptie the gauge where I want it, but I'm getting rather desperate now.

Please help me out, and tell me where I could get a hose with mounting ability to PVC pipe, or something!

Thanks!

- Rob

PS: I'll show off the gun when it's done. It's going to be sick. REALLY REALLY long sniper rifle, CPVC barrel for paintballs, bipod, laser, flashlight, and breech action loading. :)
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Unread postAuthor: deusXmachina » Sun Apr 29, 2007 7:49 pm

You can just tap a 1/4 NPT nipple or street elbow into the chamber, epoxy it, and then screw in the gauge right there. If you want it on a hose, use barb (compression) fittings with hose clamps.
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Unread postAuthor: cash68 » Sun Apr 29, 2007 7:51 pm

Please help. Standard NPT threads, and I'd like some sort of braided hose 4-6" long to screw onto the gauge, and then screw the hose into the chamber somehow. Please, PLEASE help. I can see that people are reading this topic. Please respond.
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Unread postAuthor: cash68 » Sun Apr 29, 2007 7:51 pm

I have to use hose clamps eh? There's no braided hose with NPT fittings avialable? That's kinda ghetto. Where do I get hose rated for 200PSI?
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Unread postAuthor: deusXmachina » Sun Apr 29, 2007 7:54 pm

Home depot sells vinyl braided hose (the clear kind with webbed look) in the plumbing/faucet section. You can just tap a 1/4 compression fitting into the chamber, and have 1/4 compression/threaded to attach to the gauge. The only other kind of hose I can think of you might be talking about is for gas line, which is just going to be a hell of a lot more complicated to install. And I personally like the look of compression fitting hoses.
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"On a scale from 1-10, I hope you fall in front of a bus."

:white stuff pours out of piston: "What is that? It looks like milk."
"....<i>Well...</i> it's not milk."

YAAAAAAAAYYYY WE'RE DOOMED!
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Unread postAuthor: cash68 » Sun Apr 29, 2007 8:51 pm

I like those hoses, but the threads on those hoses are WAY too coarse, plus I didn't see any pressure ratings.
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Unread postAuthor: cash68 » Tue May 01, 2007 3:57 am

I found a fitting that worked, it was an adaptor for a sink sprayer, and it went from the funky tiny little threads to pipe thread, which I then used another adaptor to use a braided stainless steel hose with compression fittings. Today I cut the grip using the table saw, which looks pretty trick, and got the gun generally together. Tomorrow I do final assembly, wiring, and testing, followed by a sweet paintjob. This gun is sick. It's HUGE, and really mean looking.
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Unread postAuthor: cash68 » Fri May 04, 2007 9:18 pm

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Unread postAuthor: wannabie » Fri May 04, 2007 9:33 pm

Sweet ass gun you got there where are you standing in the photo and whats with the funky drawings
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Unread postAuthor: Fnord » Fri May 04, 2007 9:51 pm

Looks like he was working in the concept art department of bungee. Is that master chief's helmet??
lol.
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Unread postAuthor: frankrede » Fri May 04, 2007 10:51 pm

cash68 wrote:I like those hoses, but the threads on those hoses are WAY too coarse, plus I didn't see any pressure ratings.

Not water hoses!
come on.
Be serious.
NPT means NPT.
That means NPT will work with NPT, that doesn't mean "garden hose threads.
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Unread postAuthor: wannabie » Fri May 04, 2007 10:59 pm

_Fnord wrote:Looks like he was working in the concept art department of bungee. Is that master chief's helmet??
lol.


thats what i thought those helmets look a little to famileir Halo 4 mabye? :D :D :D :D
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