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Paintball Gun Questions

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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Paintball Gun Questions

Unread postAuthor: Yonderknight » Sat Sep 09, 2006 8:29 pm

Ok, I'm thinking of making a paintball rifle, but I have a couple of questions.

1) Would it be possible to hook up a regulated Co2 or HPA tank directly to some sort of diaphragm or piston valve without the need for another air chamber? If I were to use a standard barrel sealing Tee design, the only thing that seems wrong is that it would have to be chamber filling versus behind-diaphragm fillling, so you'd need a spring. Also, once the diaphragm is open, you'd have a constant flow of air from the chamber, so would it get stuck open? Or woudl the air equalize around the diaphragm eventually and close it?

2) I heard 3/4" CPVC is the best size for paintballs, shouldnl't 3/4" regular PVC be the same? What's the difference?

3) If I wanted to use Co2, I'd have to use copper or steel pipe, correct?

Thanks in advance
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Unread postAuthor: beebs111 » Sat Sep 09, 2006 8:55 pm

2) cpvc is pvc in a size slightly smaller than copper. go to the ardware store and ask for a length of both, youll see what i mean.

3) youll want to use steel if the co2 is unregulated, you can use unregulated co2 in galvinized steel up to 1.5 inch, but that will come with a pricetag
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Unread postAuthor: Yonderknight » Sat Sep 09, 2006 9:02 pm

Thanks. I usually buy my PVC stuff at Osh, I'm not sure if they have CPVC. Regular PVC seems to be pretty expensive over there too.

I was referring to the temperature issue in the Co2 question. I heard it gets too cold for regular PVC to withstand after a couple of shots. I don't really feel like making a copper air chamber though, and I heard HPA is more expensive than Co2 to get it hooked up to a spudgun.

So I thought I could make some Tee valve out of a copper fitting and not have a copper air chamber at all, and use Co2. I'm not sure how a diaphragm would do in cold temperatures either...
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Unread postAuthor: killagorrila99 » Sat Sep 09, 2006 9:13 pm

Why dont you build something like this?


http://www.spudfiles.com/forums/album_s ... ic_id=116&
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Unread postAuthor: carlbelcher » Sat Sep 09, 2006 9:55 pm

Running a regulator directly to the main valve is a bad idea, unless you like bad performance. Regulators have extremely low flow, it would be like having a main valve with a 1/16" orifice.
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Unread postAuthor: frankrede » Sat Sep 09, 2006 10:09 pm

carlbelcher wrote:Running a regulator directly to the main valve is a bad idea, unless you like bad performance. Regulators have extremely low flow, it would be like having a main valve with a 1/16" orifice.

Thats what I was thinking. You could remove the valve on teh co2 bottle and try to find a fitting that fits inside. But then you would have to install a shrader so its just a bad idea, o would just use a regulater
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Unread postAuthor: Yonderknight » Sun Sep 10, 2006 12:08 am

Ah ok, thanks a lot. I was worried about that, so it seems like it won't work. I guess I'll just go with a HPA tank then. I don't want to have a long copper pipe running under my barrel. So unless I can find a lightweight metal air tank to use, I won't be able to use Co2 =\.
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Unread postAuthor: mark.f » Sun Sep 10, 2006 6:58 am

HPA is more expensive than CO<sub>2</sub> in the short term, but over the long run it is much cheaper to maintain and fill an HPA tank than a CO<sub>2</sub> tank. Many places I have seen so far, (mainly SCUBA shops and a little (african-ingenuity) foundry I went to), have an HP compressor hooked up to a cascade tank system that can fill your tank in half a second, for only a few cents, (or free).
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Unread postAuthor: Benny » Sun Sep 10, 2006 7:06 am

2) I heard 3/4" CPVC is the best size for paintballs, shouldnl't 3/4" regular PVC be the same? What's the difference?



Normal PVC is mesured in OD and cpvc is measured in ID.

(inside diameter outside diameter)
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Unread postAuthor: schmanman » Sun Sep 10, 2006 7:10 am

go with hpa, like markfh11q said
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Unread postAuthor: noname » Sun Sep 10, 2006 11:35 am

The best size ipie for paintballs is actually 1/2" SR 13.5, with an ID of .696". And it uses regular 1/2" PVC fittings so you don't have to get adapters from CPVC to PVC.
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Unread postAuthor: Benny » Sun Sep 10, 2006 9:55 pm

Just use some normal pipe with wadding, jeez.
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Unread postAuthor: mark.f » Mon Sep 11, 2006 5:04 am

Gosh... but a perfect fit is WAY sexier. :D

Go get somebody to cut you some paintball barrel threads inside a 3/4" coupler or something.
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Unread postAuthor: MrCrowley » Mon Sep 11, 2006 4:47 pm

and wadding slows down the fps and power and accuracy
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Unread postAuthor: SpudStuff » Mon Sep 11, 2006 5:37 pm

All this Cpvc and Pvc crap.

Nominal Cpvc is by outter diameter. add 1/8" to the nominal size to get the outter diameter.
Sch 40 PVC is all fucked up size wise.

The PVC is 0.810 INCH ID
The CPVC is 0.690 INCH ID
The Paint Balls Are 0.68 INCH OD
The CPVC is your best choice.
OSH does carry it.
BTY where you live?
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