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ball valve gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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ball valve gun

Unread postAuthor: cambot339 » Sat Nov 10, 2007 4:19 pm

I know all you punks be hating ball valves but this is my first gun, future projects might have piston. Here are some pics. A 3/4" cpvc barrel, 2" chamber, a valve for loading air and one for firing, bad primer job what more can i say?

and yes i plan on painting

My ammo is navy beans in place of airsoft BBs thats about a 300% price difference. Also a pvc bolt. And one dart that i made thanks to someones post on here (no, i'm not making a link I'm LAZY)

The chamber is DWV but it said 280psi so i assume its ok, it was water tested to 120psi by me.

Yes, i put the pictures on backwards, so sue me.
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Attachments
air gun 002.jpg
my gun and ammo
air gun 004.jpg
My dart.
air gun 006.jpg
Before.
air gun 007.jpg
after.
air gun 010.jpg
good old fort cambot.
air gun 009.jpg
What my bolt did to fort cambot.
air gun 008.jpg
My bolts last shot it broke but did lots of damage.
barr 001.jpg
longer barrel. 50". i dont have a support brace so i cant put it on yet.
Last edited by cambot339 on Sat Nov 10, 2007 6:41 pm, edited 4 times in total.

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Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 4:21 pm

I dont see pics!! Im blind!!! :lol:
No really you gotta fix that :D
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Unread postAuthor: DYI » Sat Nov 10, 2007 4:41 pm

Dude... You need a barrel with like, 10x as much volume as that one. What's the C:B on this thing?
Spring loading the ball valve would be simple and would increase performance.
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Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 4:48 pm

Well now that you have pics i can critique you :D
Its not bad at all but DYI is definately right, you can increase the barrel by alot, but i do like to have my chamber have somewhat more volume than my chamber but not as much as you have in your pic, by alot. But besides that, you could mod the ball valve too. But make sure you have adequite information about piston valves b4 you go prancing on and making one because you dont want to mess up 2 guns like i did and spend 150. Remember, you can never have too much info. :P
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Unread postAuthor: cambot339 » Sat Nov 10, 2007 4:50 pm

yah, I have a non cpvc one drying now but ill need a biger bolt for that and its about 1:2 the one on the gun is like 1:0.9
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Last edited by cambot339 on Sat Nov 10, 2007 4:56 pm, edited 2 times in total.

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Unread postAuthor: DYI » Sat Nov 10, 2007 4:53 pm

yah, I have a non cpvc one drying now and its about 1:2 the one on the gun is like 1:1.2

What? A little description of what you are talking about would be nice.
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Unread postAuthor: cambot339 » Sat Nov 10, 2007 4:56 pm

that was met to be after yours...

how do i mod my valves? is it hard?
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Unread postAuthor: DYI » Sat Nov 10, 2007 5:02 pm

How could the C:B on that be 1:1.2?
From what I can see, it is closer to 15:1.
How long is the barrel and how long is the chamber?
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Unread postAuthor: cambot339 » Sat Nov 10, 2007 5:06 pm

the barrel is only about an inch longer than the chamber i dont have the measurements on hand, or the gun, or a ruler i would say about a foot on both maby.

how do i mod the valves?
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Unread postAuthor: MrCrowley » Sat Nov 10, 2007 5:27 pm

cambot339 wrote:that was met to be after yours...

how do i mod my valves? is it hard?



You mean mod your sprinkler valve? Or spring load your ball valve?

For sprinkler valve mods go here:
http://www.spudfiles.com/forums/modding ... -t305.html

Next time search, we have loads of topics on modding sprinkler valves.
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Unread postAuthor: DYI » Sat Nov 10, 2007 5:28 pm

If the chamber and barrel are both 12" long, with the barrel 3/4" in diameter and the chamber 2" in diameter, then the C:B ratio is 7.1:1.
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Unread postAuthor: MaxuS » Sat Nov 10, 2007 5:59 pm

That is more than 12", maybe 24" atleast.
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Unread postAuthor: cambot339 » Sat Nov 10, 2007 6:41 pm

ok the new barrel is up now its 50" long and still 3/4" wide

its a ball valve and i cant find any thing on the search
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Unread postAuthor: LikimysCrotchus5 » Sat Nov 10, 2007 7:04 pm

try Advanced search and remember not to double post :)

But i would have to say i think we dont have too much info on spring loaded ball valves but for everything else pertaining to spud gun creation, shooting and everthing else under this topic, we have alot of. :D
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Unread postAuthor: MrCrowley » Sat Nov 10, 2007 9:24 pm

cambot339 wrote:ok the new barrel is up now its 50" long and still 3/4" wide

its a ball valve and i cant find any thing on the search



We do have a fair amount on spring loading ball valves, but since ball valves aren't very powerful as primary valves, not many people need to mod them.

All you do is hook a spring up to a ball valve, it's very simple to do, if you built this cannon you should be able to just use your head and you'll come up with how to do it. Very simple.
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