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The ISM, Piston Valved MB 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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The ISM, Piston Valved MB Gun

Unread postAuthor: bigbob12345 » Mon Apr 21, 2008 8:11 pm

Well I have been wanting to make this cannon for months. It was designed 3 months ago and I didnt get around to making it until now.
I name it the ISM or It Shoots Marbles

The gun
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Specs:

Chamber:42in of 1in sch40pvc.
Barrels:54in of 1/2in sch40 pvc(batteries), 60in of 1/2in sdr21(marbles, paintballs).
Valve:Barrel sealing piston valve in a 1in tee with a 1/2in porting.
Piston:Cast hot glue with a 1/4in neophrene sealing face and a small piece of a nerf ball for the bumper.
Pilot:3/4in modified orbit watermaster sprinkler valve exhausted by a blowgun.
Fill setup:1/8in threaded schrader valve
Pressures operated at:Normally 60-80psi as it is quite loud at higher pressures and would'nt want to disturb my neighbors. I have taken it up to 140psi but no higher than that until i can get to use it at some secluded place.
Ammo used:Mostly marbles and paintballs but I do shoot batteries and homemade heavyweight slugs every now and then.

In the making of this gun I cracked 2 different fittings from overtightening. One is the threaded adaptor that leads to the stock and the other is the threaded side of the tee the piston is housed in. Both were replaced rather quickly bacause I to shoot it, BAD.

GGDT says it is capable of 800fps(with light ammo)and over 200ftlb(with very heavy ammo. I dont know if that is very accurate because Im too lazy to go GGDT it again and I cant remember what it said very well.

I am very pleased with how this gun turned out. It works reliably, well, and packs a serious punch.
Also the pump up time isnt too bad which is very nice.

Here are a bunch of pics

The ISM from a couple different angles
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The piston valve
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The 3/4in sprinkler pilot
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The barrel support(tape will be replaced with a hose clamp)
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The "stock" for shoulder shooting
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I will give it a paint job tommorow(dark green) and possibly take a vid.

Ill have damage pics and pics of the piston up in a jiffy.
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Last edited by bigbob12345 on Tue Apr 22, 2008 9:19 am, edited 3 times in total.
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Unread postAuthor: ghostman01 » Mon Apr 21, 2008 8:38 pm

wow thats one big gun ! woooooo first post! very nicely made
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Unread postAuthor: STHORNE » Mon Apr 21, 2008 8:42 pm

nice job bigbob. damage pics? video?

don't be slackin' on such a nice gun bigbob....lol

job well done!
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Unread postAuthor: elitesniper » Mon Apr 21, 2008 8:53 pm

haha, nice plinker, but couldn't you just put a marble barrel on your other piston gun, saving you some money?
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Unread postAuthor: bigbob12345 » Mon Apr 21, 2008 9:07 pm

Thank you for the comments

wow thats one big gun

Im going to have to disagree with you there, the chamber volume is only 40ci :lol:
But it still very powerful

damage pics? video?
don't be slackin' on such a nice gun bigbob....lol


Well damage pics are going to have to wait, along with a the vid because my piston crapped itself(broke in half :roll: ) while I was shooting a few things for damage pics.

I wont get it fixed till the weekend :(

haha, nice plinker, but couldn't you just put a marble barrel on your other piston gun, saving you some money?


:roll:


Edit: Haha not to many veiws or comments, too bad :( I really like this gun
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Unread postAuthor: taytayswims » Sun May 04, 2008 10:04 pm

what is the size of the nipple used for the trigger system?
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Unread postAuthor: bigbob12345 » Sun May 04, 2008 11:22 pm

If I know what you mean, 3/4in
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Unread postAuthor: JDP12 » Mon May 05, 2008 7:25 am

seriously taytay?? You've gotta stop it, that's the second time you've asked that at least that i've seen.
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Unread postAuthor: taytayswims » Mon May 05, 2008 6:31 pm

ilovetoblowthingsup wrote:seriously taytay?? You've gotta stop it, that's the second time you've asked that at least that i've seen.


i have only asked once but my cousin has been using my account sometimes and he has been commenting people and posting all kinds of non-sense i got him to stop and im sorry for wasting peoples time
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Unread postAuthor: bigbob12345 » Mon May 05, 2008 6:36 pm

taytayswims wrote:
ilovetoblowthingsup wrote:seriously taytay?? You've gotta stop it, that's the second time you've asked that at least that i've seen.


i have only asked once but my cousin has been using my account sometimes and he has been commenting people and posting all kinds of non-sense i got him to stop and im sorry for wasting peoples time



just dont have your account automaticly come up and then he wont be able to mess up your account.
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