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new gun. new a little advice

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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new gun. new a little advice

Unread postAuthor: carter » Sat Dec 22, 2007 6:21 am

hey dudes im building a new gun. thanks to Bunnings building a new store where i live i can finally get my hands on a sprinkler valve. but i wanted something different. a gun where i can get 2 shots without pumping up again so i will be putting 2 cambers on it that will be regulated using ball valves. just wondering if anyone has done this before and how well it worked.
i want it to be like a rifle shooting marbles. bout 125 psi.
does anyone no the weight of 1/2inch marbles. ive searched but gotten lost in the 30 or so pages
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Unread postAuthor: cerberus » Sat Dec 22, 2007 6:31 am

I know 16mm (0.62") marbles are approx 5g each if that helps.
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Unread postAuthor: carter » Sat Dec 22, 2007 6:33 am

cheers man. i'll be looking at something like 600fps with a 3ft barrel which will be cool
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Unread postAuthor: MrCrowley » Sat Dec 22, 2007 3:07 pm

Yes people have done it before, waste of time, space, money and a comfortable design in my opinion.
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Re: new gun. new a little advice

Unread postAuthor: Ragnarok » Sat Dec 22, 2007 3:13 pm

carter wrote:does anyone no the weight of 1/2inch marbles. ive searched but gotten lost in the 30 or so pages

Easy. Density of glass * volume of marble... about 2.5 to 3 grams.

Double chambers is nothing new, nor is it that useful. I'd still use a single chamber any day.
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Unread postAuthor: homedepotpro » Sat Dec 22, 2007 3:44 pm

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Unread postAuthor: carter » Sat Dec 22, 2007 5:06 pm

i'm thinking something hand held so i can understand when you say its bulky. but i was thinking bout having one camber under the barrel and the other in th stock
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Unread postAuthor: Novacastrian » Sat Dec 22, 2007 5:14 pm

MrCrowley wrote:Yes people have done it before, waste of time, space, money and a comfortable design in my opinion.


Hehehehehehe, way to go MrC!

http://www.spudfiles.com/forums/download,id,2768.html , Now that would be uncomfortable to hold :lol:

You could just arrange the chambers end to end, i don't see how it would change the overall shape of the cannon.
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Unread postAuthor: carter » Sat Dec 22, 2007 5:19 pm

do you mean have an inline barrel with a valve in the middle? and to mc i'm looking for something out of the norm. and its bout time i made a cannon thats not ghetto. money really isn't a problem
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Unread postAuthor: MrCrowley » Sat Dec 22, 2007 5:49 pm

carter wrote:and its bout time i made a cannon thats not ghetto.


Well who said a one chambered gun is ghetto?

It's really not worth it, if you use a sprinkler valve as long as it's hooked up to a continous supply of air like CO2 or an air compressor it can be semi-auto.

It's just really pointless unless there is a reason to have two chambers.

Just build something like <A HREF="http://www.spudfiles.com/forums/viewtopic,p,123690.html#123690">This</a> if you're shooting marbles
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Unread postAuthor: carter » Sat Dec 22, 2007 6:19 pm

all my other guns have been a little dodgey. this gun i'm going to bondo the stock etc... make it look sweet. but a lot of people have done the same sort of thing i just want it different. thats why i'm thinking dual chambers. also with the compressor i want portability so thats out of the question but i may use the co2.
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Unread postAuthor: Ragnarok » Sat Dec 22, 2007 6:50 pm

carter wrote:and its bout time i made a cannon thats not ghetto.

I quite agree with MrC - since when has a single chambered launcher been a ghetto design? (Unless JSR is making it :P - jk)
If you take an experienced member, they are unlikely to make a double chamber cannon.

Regulated CO<sub>2</sub> is indeed a nice option, but it will depend on chamber size. A large chamber at high pressures will use up CO2 quite quickly, so be a bit sparing on how much you use.
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