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Carbon fiber/fiber glass stock chambers

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Carbon fiber/fiber glass stock chambers

Unread postAuthor: john bunsenburner » Sat May 16, 2009 8:03 am

Well as some of you know i am building my gun's stock out of fibre glass(how to should be coming up as soon as I start building it) and that made me wonder: If I made the stock, which is hollow on the inside thick eanoth and maybe even out of carbon fiber then I could use it as a chamber too. Do you think that would be a good and feasable idea? how thick would the walls have to be for lets say 500psi? Any comments, questions or ideas about this idea?

Thank you in advance!

John Bunsen
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Unread postAuthor: ALIHISGREAT » Sat May 16, 2009 8:35 am

wrapping an existing container to make it stronger is plausible... but masking it just out of carbon fibre could be risky.
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Unread postAuthor: inonickname » Sat May 16, 2009 10:07 am

No, you can get scuba tanks made from carbon fiber which are stronger and lighter than their aluminum equivalents.

Not sure on the quality of your materials and your level of craftsmanship so unsure. Probably in your interests to do a mock up and pressure test it pre-use
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Unread postAuthor: MountainousDew » Sat May 16, 2009 11:26 am

inonickname wrote:Not sure on the quality of your materials and your level of craftsmanship so unsure. Probably in your interests to do a mock up and pressure test it pre-use

Just take a little block and cut out some of the inside, leaving a hole on one end and glue in a shrader or something to test the strengths at different thicknesses.
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Unread postAuthor: starman » Sat May 16, 2009 11:34 am

Take a gander at the Dragon Plate stuff. It ain't cheap.....
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Unread postAuthor: Biopyro » Sat May 16, 2009 12:30 pm

I think you'll find, that unless the stock will be cylindrical, it won't be worth the money. I wouldn't trust my own fibreing skills for something like that.
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Unread postAuthor: john bunsenburner » Sat May 16, 2009 5:17 pm

Well I would be making the actual stock from it that means it will neither be cylindrical nor will i be made form a tube. Instead I would use carbon/glass fibre web(i am not sure of the technical term) and then dip that into the according epoxy/glue and then use it like a kind of papaer machè and just wrap it round and round. Theoretically this *could* be done ina vacume and fairly professionally, but the feasability of the idea makes it a bit unlikely to be used. How ever alot of weight and problems could eb eliminated and the huge c:b ratio would allow for a mult shot gun using a hammer valve, all with a very realistic look.
Any more comments and ideas?
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Unread postAuthor: jonnyboy » Sat May 16, 2009 6:54 pm

I would just build a stock around the chamber, so it wouldn't be awkwardly thick use maybe .5 inch copper and run it through the stock then a 180 and go again and again.
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Unread postAuthor: Lentamentalisk » Sat May 16, 2009 7:50 pm

Unless you make it perfectly cylindrical, you are not going to get very good results with carbon fiber. Remember, it has amazing tinsel strength, but is not at all resistant to bend. when you have something nice and flat, like a stock, it will do its best to form a cylinder, exploding in your face.
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Unread postAuthor: Hawkeye » Sat May 16, 2009 8:23 pm

I don't believe any tanks are pure carbon and Epoxy. I think there is always at least a thin walled metal chamber that the carbon reinforces.
Most Carbon composite structures would be formed around a latex bladder in paper mache fashion and then the bladder is deflated and removed.
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Unread postAuthor: thedeathofall » Sat May 16, 2009 9:20 pm

Im pretty sure hawkeye is right about the tanks. I read somewhere (still looking for site) that most carbon fiber tanks, are simply normal aluminum ones wrapped in carbon fiber. This allows them to be filled to 4500 psi instead of 3000.
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Unread postAuthor: john bunsenburner » Sun May 17, 2009 2:05 am

Ok, so really doing this would be dangerous and pointless as the carbon fibre would deform and/or explode. Too bad really, would of been pretty cool. I persume I could line the indiside of the stock with sheet metal and then re inforce with carbonfibre, then again i doubt it is really worth it. Thanks fro the input guys!
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Unread postAuthor: daccel » Tue May 19, 2009 1:02 am

The sheet metal would still have the problem of being a weaker shape than a tube, though.

With the right tools and materials you could make a tie rod chamber like the one pictured below, something I've been meaning to try for a while. With aluminum tubing and stock for the bottom block and top manifold, it would be quite light. Then fiberglass around to give the desired shape.

Jonnyboy's suggestion would also work, but regular fittings won't let you get the tubing very close so there will be wasted volume.

Edit: would help if I attached the pic :roll:.
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