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Aluminium bottles

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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Aluminium bottles

Unread postAuthor: flamerz14 » Sat Jul 21, 2007 9:39 pm

I want to make an inline marble gun with a chamber of 2 aluminium bottles.Barrel will be 15mm(?) pvc. The bottles have a total volume of 1500cm2.

1.What is the effective barrell length?
2.Is just using epoxy to hold a mle adapter to the mouth of the bottle safe? (the botle's opening has too female many threads.I cant fit in a 18mm copper adapter.)
3.What presure can I take it up to?
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Unread postAuthor: DYI » Sat Jul 21, 2007 9:45 pm

A 424cm barrel would give you a 2:1 ratio, although that could be impractical...
The info you gave is to vague to give us any idea of safe working pressure.
The safety of holding it together with epoxy depends on the intended working pressure, which cannot be known until you give us more specs.
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Unread postAuthor: flamerz14 » Sat Jul 21, 2007 9:54 pm

Lets see... :idea: I know of this high pressure epoxy(1500 psi). I intend to work it somewhere at its maximum pressure..wow.4m.thats long.What if I just used one bottle?(750cm2)
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Unread postAuthor: iPaintball » Sat Jul 21, 2007 10:32 pm

JB weld works great for that appllication, but not at such high pressures. If yuo intend to operate at such high pressures, what will you use to fill you chamber? What would you use as a valve?
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Unread postAuthor: flamerz14 » Sat Jul 21, 2007 10:52 pm

nono :lol: epoxy rated to 1500 psi.I'm bringing it to only ard 200 psi..maybe a shock pump? idk i don't have a copressor..
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Unread postAuthor: shud_b_rite » Sun Jul 22, 2007 1:11 am

Where do you get these aluminum barrels you speak of? And if this bottle is what I think it is, it should be safe to about the same pressures of a fire extinguisher (120-200) psi.
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Unread postAuthor: mike1010 » Sun Jul 22, 2007 2:25 pm

shud_b_rite wrote:Where do you get these aluminum barrels you speak of? And if this bottle is what I think it is, it should be safe to about the same pressures of a fire extinguisher (120-200) psi.

you must mean bottles
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 23, 2007 1:39 am

Some useful refernce, thebud gun on spudtech ;)
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Unread postAuthor: flamerz14 » Wed Jul 25, 2007 8:09 am

Sadly my bottle's quite different...no taper justa botle with a ~18mm i.d. mouth..and about the effective barrel length?? i can put a 4m barrell on a sniper..
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 25, 2007 9:45 am

Any data on the wall thickness of the aluminum, what the bottle was originally used for? Some pictures would be helpful.

A 4 metre barrel is a bit much, it needs to be less than 2 metres to be managable.
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Unread postAuthor: flamerz14 » Thu Jul 26, 2007 5:40 am

wall thinkness is around 3mm on thickest.Bottle is drinkng bottle(duh) yea 4m is load much, any other C:B i should use?
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 26, 2007 6:24 am

3mm sounds like it will hold 100 psi safely, if it was originally made for carbonated drinks then it should be rated to at least 150 psi anyway.

For a 1.5 litre volume (and presumably 3/4" barrel if it's a marble gun) you can have the longest barrel you're comfortable with managing.
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Unread postAuthor: flamerz14 » Sun Jul 29, 2007 3:09 am

i'm sticking with one bottle (750ml) and thinking of using a C:B of 0.7:1 watcha think?
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Unread postAuthor: spud yeti » Sun Jul 29, 2007 4:09 am

For lower chamber pressures, a bigger ratio is generally better as far as I know.
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really good quote/phrase here
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