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Woodstock marble cannon

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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Are wooden stocks the way to go, or is raw beatiful?

I get wood over wooden stocks!
13
59%
I love seeing a gun naked, I want see all its "bits"!
9
41%
 
Total votes : 22
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Woodstock marble cannon

Unread postAuthor: SleekZ » Mon Apr 30, 2007 8:56 am

Me and my friend put this "together" about 6 months ago, over a couple of weekends, back when we had little-to-no knowledge on what we were doing! :roll:
It's about as basic as it gets, but I reckon it looks somewhat like a rifle, and is stacks of fun to shoot! :wink:
<a href="http://photobucket.com" target="_blank"><img src="http://i134.photobucket.com/albums/q99/sleekz_1989/DSC09989-1.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
Basically it consists of;
Barrel; approx 55cm long, 17mm I/D copper pipe.
Chamber; 45cm 3/4" galv. riser pipe.
Valve; 3/4" ball valve
Firing mechanism; spring loaded leaver-release bolt lock....if that means anything to anyone!
Valve; shrader valve from a bike tube.

The firing mechanism is a piece of bar which replaces the original ball valve handle (the spring attaches to this), and a piece of rod joining it to another piece of shorter bar, with a hole drilled in it. This hole lines up with a small piece of metal pipe going directly through the wood, which a cuphead bolt slides into when the gun is cocked.
The bolt butts against the bent section of the original ball valve handle, which acts as a lever and pulls the bolt out of the hole in the bar, allowing it to turn, due to the tension of the spring, opening the valve.
<a href="http://photobucket.com" target="_blank"><img src="http://i134.photobucket.com/albums/q99/sleekz_1989/DSC09990.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

<a href="http://photobucket.com" target="_blank"><img src="http://i134.photobucket.com/albums/q99/sleekz_1989/DSC09993.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
This is the gun when cocked; to fire you just push down (horizontally/towards the gun) on the red lever which pulls the bolt out from the "custom-built" ball valve opening handle.

As I said it's a pretty simple design, but it's comfortable and easy to aim, as you can look straight along the top of the barrel. We've found it's pretty accurate from about 20m; using trees with approx. 50cmx50cm targets scratched on them, we managed to get like 16/17 inside the target (most near the middle!), with he only exception being when I shot 5 marbles, and only one of them just missing the target!
Generally we've just shot at trees and beer bottles, but the accuracy is very surprising and it's easy to nail even pieces of the broken bottles!
When shooting at trees, the marbles more often then not stick in more then half. One particular tree we often shoot at has about 20 marbles lodged in!
Generally we pump it up to about 160psi, but it quite happily takes 230psi when we feel patient enough for the compressor to get it that high!

Anyway let me know what you think of it, or feel free to ask questions! :wink:
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Unread postAuthor: Billy Bob » Mon Apr 30, 2007 1:54 pm

Thats the first time i see a feather ball valve solution.
I remember my friend and i wanted to do the same because its more comfortable ( like you say ) and you can aim better if you shoot.

One question: how far will it open ? Video ?
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Unread postAuthor: iknowmy3tables » Mon Apr 30, 2007 2:07 pm

that reminds me of a bumpersticker that said "this was the only woodstock back in my day" and it had a picture of a rifle :lol:
spring loaded ball valves are pretty neat, but not as good as sprinkler valves
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Unread postAuthor: frankrede » Mon Apr 30, 2007 5:52 pm

nasty!
But it looks liek it will be fun to shoot!
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Unread postAuthor: chaos » Fri May 11, 2007 7:56 am

looks like phun*... i love wood stocks, im planning to make one for my s400 soon.

i also think you should buy a shock pump, seeing as your chamber isnt too* big, you could easily wind 300psi into that sucka.

peace
chaos
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Unread postAuthor: spudthug » Fri May 11, 2007 9:55 am

chaos i like ur stainless look of the cannon u should keep it metal..but its ur cannon so i cant influence u hehe
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: SleekZ » Fri May 11, 2007 11:21 am

is a shock pump the one you told me about, which you get from motorbike shops?
yeah 300psi would be rather fun! even at 230 she's not bad....not bad at all! As I said I tend to put a few marbles in at a time, so at 300 it would be pretty destructive! :twisted:
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Unread postAuthor: chaos » Fri May 11, 2007 7:13 pm

SleekZ wrote:is a shock pump the one you told me about, which you get from motorbike shops?
yeah 300psi would be rather fun! even at 230 she's not bad....not bad at all! As I said I tend to put a few marbles in at a time, so at 300 it would be pretty destructive! :twisted:


ya want to be careful using more than one marble at a time they can shatter in the barrel throwing razor-like shrapnel out of the barrel.

spudthug i changed my mind a lil, instead of the "wood", might plasma cut a stock out of some 6mm plate to give it the "tactical" look. eventually ill get CO2 for it then somehow make a spring loaded magazine for marbles/sinkers, then ill be happy with it.

EDIT: one last note by looking at your cannon it could probably hold a bit more than 300, pobably 400 considering the weakest component is the copper
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Unread postAuthor: ammosmoke » Fri May 11, 2007 7:26 pm

You have a PLASMA cutter!?!?! NO FAIR!!! I think that making out of a plate would be very cool! Is it the kind that you can program? I want one so bad.... Although, wouldn't such a thin plate be uncomfortable and hurt when you shot the gun? You would prob want to make it have a flat piece on the end so you dont hurt your shoulder.
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Unread postAuthor: chaos » Fri May 11, 2007 7:36 pm

Yer i was thinking about welding a piece of tube where the butt of it contacts with your shoulder (i think plate would be uncomfortable), then ill padd it with something soft like insulation hose or somthink.

peace
chaos
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