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Allmost Done! [Updated with damage pics]

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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Allmost Done! [Updated with damage pics]

Unread postAuthor: jrrdw » Tue Sep 12, 2006 8:45 pm

Chambers are 3" diameter 5' long. Everything else is 2", barrel is 8' long. Easy to figure out from here. The story board of pics are a little mixed up, bare with me, i'm a amature!

Pics here:
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Last edited by jrrdw on Mon Oct 09, 2006 6:57 pm, edited 1 time in total.
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Unread postAuthor: ProfessorAmadeus » Tue Sep 12, 2006 8:49 pm

Looking good! That is one good sealing piston it looks like. Does it slide smooth on its own or do you have to lube it.
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Unread postAuthor: jrrdw » Tue Sep 12, 2006 8:51 pm

Slides just rite, very little drag on the o-rings. I'm painting it gloss black.
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Unread postAuthor: ProfessorAmadeus » Tue Sep 12, 2006 9:02 pm

Has this type piston gun been made before? I think this is a very original cannon and should have some great results!
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Insomniac wrote:Hey why am I a goose???? Why not somthing a little more awe inspireing, like an eagle or something? LOL

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Unread postAuthor: jrrdw » Tue Sep 12, 2006 9:06 pm

I don't know if anybody else has made one from wood before me or not, it's what i had around to use.
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Unread postAuthor: SpudStuff » Tue Sep 12, 2006 9:45 pm

OH NO. The bell reducers you used are not pressure rated. But nice work.
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Unread postAuthor: Shrimphead » Tue Sep 12, 2006 10:13 pm

SpudStuff is right. If I were you, I would cut those out now and replace them with couplers and reducing bushings.
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Unread postAuthor: SpudStuff » Tue Sep 12, 2006 10:21 pm

YAH. . . . . . . .
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Unread postAuthor: MrCrowley » Tue Sep 12, 2006 10:41 pm

you will have alot more fun with it taking it to 100psi without being skeptical of it blowing and if you ever want to sell it its best to have pressure rated parts.
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Unread postAuthor: jrrdw » Wed Sep 13, 2006 5:33 am

A 35 year retired plumber working at Home Depot told me if it's that thick it's sch40, and pressure rated. I ask him about those reducers spacificly, and he said yes, pressure rated. If they blow, i'll cut them off, go back up, make my case for him to wear them as earrings for the rest of the day, sound cool?
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Unread postAuthor: CS » Wed Sep 13, 2006 4:20 pm

Frick'! Everyone just goes around blabbing what they heard the last person saying without any backing, except so-and-so told me. Bell reducers are relativly the same thickness. The concern lyes in the shorter socket depth, not the thickness of the fitting. You could have 1' thick walls and have a low surface area of a short socket depth resulting in a failure.
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Unread postAuthor: schmanman » Wed Sep 13, 2006 4:34 pm

nice cannon. very clean, nice piston valve. the piston is cool, Is that shaft bolted to the clean out cap a guide rod for the piston?
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Unread postAuthor: jrrdw » Wed Sep 13, 2006 6:30 pm

No, it is what i used to chuck it in my drill press so i could sand it down to size quickly, worked like a champ, (champs work really really good!).

The man i'm repeating has 35 years experance, told me they are good to 120psi, if they are good for that, i aint gonna sweat about it, besides, i'm useing 1/4" cage wire to protect from gernadeing.

They will eather hold, or they won't. I'll bet you your pay check i'm gonna find out!
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Unread postAuthor: SpudStuff » Wed Sep 13, 2006 7:00 pm

Okay if you feel safe but i think $10 is a fair price for peace of mind. :?
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Unread postAuthor: jrrdw » Wed Sep 13, 2006 7:21 pm

I was looking to go the other way, (reducers), but they didn't have any that went from 3" to 2", i coundn't get it to go into the 3" chamber, the reducers that said 3 to 2" wouldn't fit inside the 3" pipe i'm useing for chambers, and i looked all around, nobody had them, got tired of wasting my gas!

Like i said, i bet i find out!
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