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square chamber?

A place to ask general spud cannon related questions.
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square chamber?

Unread postAuthor: pat123 » Thu Oct 04, 2007 4:35 pm

has anyone made a gun like this? I just thought that it would look kind of cool. I am about to go to lowes so i might get the stuff and make it. i already have the 2 inch piston and the 4inch pipe.
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Unread postAuthor: ShowNoMercy » Thu Oct 04, 2007 5:38 pm

It would work but I would be worried about the recoil from firing a heavy object all being directed against the one lone piece of pipe connecting the base to the barrel. I had a 2inch elbow blow up when I fired a heavy load of nails out of my cannon so thats my two cents.
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Unread postAuthor: PVC Arsenal 17 » Thu Oct 04, 2007 6:07 pm

ShowNoMercy wrote:It would work but I would be worried about the recoil from firing a heavy object all being directed against the one lone piece of pipe connecting the base to the barrel. I had a 2inch elbow blow up when I fired a heavy load of nails out of my cannon so thats my two cents.


On the money.

You should always make an effort to minimize stress on the pressurized parts. It would look good, but probably not the best thing to do.

When Eugene Stoner designed the m16, he first took note of the problems the m14 had due to its shape. The m14's stock was below the barrel to improve the ease of aiming, but at the same time, the recoil of the rifle then caused the whole thing to pivot because of how the stock would transfer the recoil. He took note of this and put the stock of the m16 inline with the barrel to directly transfer the recoil and prevent pivoting. He then just raised the sight to fix to put it line with the shooter's eye.

I believe this video describes that: http://youtube.com/watch?v=4weIh3Mc6kU

Apply this same concept to your spud gun. You want to try to eliminate the pivoting effect which would put stress on the elbow/tee connecting the chamber to the barrel. Make sure the recoil will be absorbed directly and there will be no stress that could lead to failure.
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Unread postAuthor: pat123 » Thu Oct 04, 2007 6:31 pm

ok thanks a lot. I looked at the parts for it today. and i didn't realize that a 4in elbow is 9 dollars. the only guns have have had to buy parts for were 2 inch and 1/2inch and they are pretty cheap.
I am going to redesign it a little.

thanks pat
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Unread postAuthor: Redcoat » Thu Oct 04, 2007 7:22 pm

If you give it a it more barrel support it should be fine.
What program are you using to draw those up?
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Unread postAuthor: Hailfire753 » Thu Oct 04, 2007 7:44 pm

Yeah, you are gona want to support the barrel better. BTW, what did you use to make the diagram?
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Unread postAuthor: pat123 » Fri Oct 05, 2007 4:54 pm

I got the program off of cannoncreators site in the downloads section
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Unread postAuthor: Infernal Maveric » Sun Oct 07, 2007 4:47 pm

My first copper pnuematic had a square chamber http://www.maj.com/gallery/Infernal-Maveric/Spudgun/spud3.jpg
But I have heard of the joining T exploding because of the stress. You would need some pretty heavy duty supports to the barrel to keep it in place when fireing
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Unread postAuthor: veginator » Sun Oct 07, 2007 4:57 pm

Nice bed spread Inernal maverick. how old are you?
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Unread postAuthor: pat123 » Mon Oct 08, 2007 6:27 pm

Why would this have any more stress then the mega launcher or the SWAT gun it is basically the same except for the chambers connect
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