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bolt/breech pnue rifle, multi shot

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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bolt/breech pnue rifle, multi shot

Unread postAuthor: tarmann_90 » Tue Apr 03, 2007 12:22 am

ive been trying to make a new rifle but i cant figure out a good way to get more than one shot out of a chamber(without halving the presure each time). The only way i can figure out how to do that is by having multiple tanks. Ive already made a new way of breech loading. It uses a slide repair coupling and slides through a 1.5 " pice of pipe. The good thing about this is it doesnt leak! decided gumballs will work perfectly in a 1" barrel. Is there a way to fit dual sprinkler valves into a single rifle?
blue- moded sprinkler valve
red- 1.5 inch pipe where the barell slides through
cyan-chamber
yellow- 1 " slide coupling
when its finnaly built with all its upcoming changes ill post pics
any help would be appreciated
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Unread postAuthor: hi » Tue Apr 03, 2007 1:10 am

Why don't you make a three shot tank and wear it on your back? you could have a hose run from that to the gun. have ball valves between the tanks. This would give you 4 shots because one extra chamber is on the gun. Also, for the "bolt", you should use a 1.5 inch coupling and sand out the ring in the middle, it would give a little more flow of air and would be just as tight. I would also be easier to load.

Yes, you can rig up duel sprinkler valves. you need to connect them with a tee and two elbows on one side and do the same on the other. (one for the chamber and one for the barrel. so in total you need two tees and 4 elbows. I dont think it would really help much though. it might give you a little more flow, but not much.

EDIT- just FYI, 1'' couplers don't fit in 1.5 inch, they are to small.
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Last edited by hi on Tue Apr 03, 2007 1:12 am, edited 1 time in total.
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Unread postAuthor: pyrogeek » Tue Apr 03, 2007 1:12 am

The bend will reduce the performance since it's just dead space. If you make the bend out of larger diameter pipe, and put the valve right before where the projectile will be, it will be more powerful.

To make a multishot gun, you either need multiple chambers, or a portable air supply like a CO2 cylinder.
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Unread postAuthor: joannaardway » Tue Apr 03, 2007 4:45 am

Use a regulator - this will give you the same pressure each time.

Basically, you have one cylinder at over the pressure you intend to use, the regulator sits in between this and your "firing chamber", and by virtue of a ball valve you just happened to put in between the regulator and chamber (by pure chance), everytime you open the valve, the regulator lets the same amount of pressure into your "firing chamber" each time (until your high pressure cylinder falls below the pressure you are regulating out).

Regulators aren't expensive. I think about $20 US, but I don't know for certain (because I lives elsewhere like)
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Unread postAuthor: tarmann_90 » Tue Apr 03, 2007 10:45 am

i know i didnt explain i tright but the 1" pipe should slide through a shaved 1.5" to 1" coupling. the 1.5" pipe is just to hold it there. i guess its not a real bolt since the barrel will actually move. the 1' repair coupling isnt supposed to go into the 1.5" inch pipe, just kinda slide between...
dont know why i didnt think of the tee, but thanks. i might use the backpack idea but separarate chambers whould prob be on the ground or somethin
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Unread postAuthor: SPG » Tue Apr 03, 2007 2:16 pm

Regulator, simple as that. There's been plans before for a chamber with a plunger in it acted on by a spring so that the pressure remains constant inside the chamber but the volume is reduced. At first people said "where are you ever going to get a spring strong enough" but there's plenty of springs out there if you think laterally that could do it.
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Unread postAuthor: Hawkeye » Tue Apr 03, 2007 6:04 pm

One way of figuring it out is to use any one of a number of plans that other people have thought out and either made or posted detailed plans for.....
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Unread postAuthor: Kronnkk » Tue Apr 03, 2007 6:13 pm

i dont know about a reapeater out of one barrel but i was thinking about a revolver type that has a bunch of barrels
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Unread postAuthor: integral » Tue Apr 03, 2007 9:02 pm

it would be harder to seal each "breach" of the revolver barrel... just go a gravity fed hopper via a tee. as for ur multishot chamber, the only real option is an on board air supply. the multiple chamber idea would be impractical and bulky, and at most 4 shots. u could also use a compressor+regulator via a qd to have a constant supply of air.
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Unread postAuthor: Kronnkk » Wed Apr 04, 2007 12:47 pm

thank you for the ideas . i was realy thinking about making a wooden sproket type peice for the front ,and back of a 55gal drum and rotating it on a axle and when it reached 11:00 or 12:00 having each barrel toch a charged electrode that wold spark that barrel what do you tink bro ?
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Unread postAuthor: A-98 » Wed Apr 04, 2007 1:39 pm

joannaardway wrote:Use a regulator ...Regulators aren't expensive. I think about $20 US, but I don't know for certain (because I lives elsewhere like)


i beg to differ. i got mine from palmers pursuit, its really good quality, but the entire rig (reg, pressure hose, guge, ball valve, lube) cost me $145. its worth it tho.
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Unread postAuthor: Hawkeye » Wed Apr 04, 2007 4:44 pm

She means a regulator that isn't designed for paintball I think. Something like you get at HD for use with a compressor.. They are about 25$.
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Unread postAuthor: tarmann_90 » Wed Apr 04, 2007 11:02 pm

actually i would love to be able to fire this thing like a paintball gun, if there is any way to replicate that
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Unread postAuthor: tarmann_90 » Tue Apr 10, 2007 10:03 pm

thanks spg, but ive got another idea. what if i were to place a plunger into the tank, and have it regulate the pressure as the pressure in one side increases, the plunger will move to prssurize the other side.
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Unread postAuthor: tarmann_90 » Tue Apr 10, 2007 10:14 pm

this way it could be like a spring, but you can change its resistance, and its cheaper. also you could take air from both sides
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