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strange ideà

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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Unread postAuthor: SpudFarm » Tue Feb 19, 2008 10:51 am

i am thinking of cutting the endcap of my marble gun and solder on a 180 degree elbow then a piece of the same pipe as the chamber just as long and solder on under the main chamber then a piston so the main chamber volume wouldn't get smaller.

but if i do it that way and compress it all the way to the elbows would i get about 300psi out of primary 150psi?
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 3:28 pm

I just did this up on paint and do you think this would work?
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Unread postAuthor: subterranean » Tue Feb 19, 2008 4:14 pm

hotwied-
ITs like a syringe. Block the end and squeeze the pressure increases
thats the analogy i was goin for. If the bike pump is the pressure chamber, then pumping it one time would increase pressure, but since there will be a very small volume left over it might not be worth the trouble.. thats basically what what the drawing shows.

The new drawing looks good. I think with a small barrel it would work nicely. i might look a little disproportioned though
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 4:23 pm

I know it wasn't good I was rushing so that the tread wouldn't be lost before I could post to it.
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Unread postAuthor: subterranean » Tue Feb 19, 2008 4:27 pm

I know it wasn't good I was rushing so that the tread wouldn't be lost before I could post to it.


lost? You mean not on the recent topics list? you can always just go to the forum section and clickon pneumatic discussion.
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Unread postAuthor: iknowmy3tables » Tue Feb 19, 2008 4:36 pm

this is just like a bbgun, the efficiency isn't so great after compresing the thing to half the volume you only produce like 14psi right?

I'd defiantly prefer the caulking gun solution over a screw
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 4:36 pm

I know that's what I meant off the rescent topics list but anyway :roll:
I have a bb gun that with one stroke of the piston the gun is charged and it shoots about 411 fps range so I think this design would work.
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 4:49 pm

I would say it's like exsponencial growth probably spelled that wrong and what that is is if you compress the chamber .50 way and the pressure doubles .75 pressure quadruples .87.5 the pressure is then 6 times as large

15psi atmsphere start of stroke
30psi .50
200psi .75
600 psi .87.5

I don't think it would go to 600 psi but maybe.
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Unread postAuthor: SpudFarm » Tue Feb 19, 2008 6:03 pm

it has potential if i do as i told in my last post. but i think spudchuckers numbres are of :shock: if i charge it to 150 psi then compress it i would get 6000psi :shock:
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 6:04 pm

Oh yes you would also use a larger diameter pump pipe.
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 6:08 pm

what are my numbres of?
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Unread postAuthor: SpudFarm » Tue Feb 19, 2008 6:15 pm

look at file comment
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this is what i have thinked to by this point. i probably make a ball vale between the pump and main chamber so the piston get a rest when shot.
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 6:21 pm

you contridicted yourself there it says o psi until screw screwa in but then it says the space between piston and valve is precharged to 150 psi mmmmmmmmmm.
so what are my numbers of?
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Unread postAuthor: SpudFarm » Tue Feb 19, 2008 6:26 pm

sorry :oops: i was editing the last picture and wasent thinking of that:- P and it is going to be precharged to 150psi!

i think it is pretty far off to. it cant be 6000 psi of the drawing i just made :shock:
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 6:35 pm

well you wouldn't go that far to 600 psi you wouldn't be able to push the gun down with that pressure well I wouldn't but you could probably get to 300 maybe the piston foot strrips and the catch mechanism on a long threaded rod so the catch mechanism could be adjustable.
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