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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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Unread postAuthor: scottcrete » Thu Apr 03, 2008 7:17 am

great gun.. i was in fear for the fairlady sitting there.....
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CONTACT ME:

email= scottcrete@yahoo.com
myspace = http://www.myspace.com/mrfixithoffer

phone = email me and we will talk
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Unread postAuthor: WEEMAN » Thu Apr 03, 2008 1:25 pm

thats awesome!!!!!!!!!!!
but now the question comes can you make it better? :shock:
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Unread postAuthor: Tater Salad » Thu Apr 10, 2008 7:26 pm

i love the piston setup, but i bet you could reduce the recoil of the gun by having it flip up to parallel the chamber and barrel in over/under style, so the piston is firing the same direction as the golf ball, and by reducing recoil you can probably help preserve the life of the gun, and reduce potential risks and misfires.
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Unread postAuthor: Thunderbug » Wed Apr 16, 2008 8:17 pm

Clide, completely reworking and putting in linkages etc. may be the next step, but you sure took a H***uva first step.

I'm doing mindwork on a smaller steel version of the HEAR valve.
I like the o-rings, but in need of a lathe, I am going in the direction of more flappy valving. Something kitchentable-ish.

Aiming for a .177/.22 pellet chucker, I might start somewhere in the middle.
I've always liked the idea of self-stabilized projectiles (fins or weight differences). Lead-tipped cardboard tubes?

Anyway, first thing is the valve.

Good luck with your further projects!
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Unread postAuthor: mattyp » Thu May 08, 2008 1:14 am

outstanding gun
just one question how does the ball stop work
could someone please explain
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Unread postAuthor: Lentamentalisk » Thu May 08, 2008 2:47 am

It stops the ball. There is a little lip or bit of friction or something. Use your imagination.
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Unread postAuthor: clide » Thu May 08, 2008 10:35 pm

The ball stop is just a piece of hanger wire that extends into the barrel. It interferes with the ball so it can't roll forward. When the bolt moves forward the wedge shape allows the bolt to push it down and out of the way. That little red piece in the animation represents the actual ball stop fairly accurately.
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<a href="http://gbcannon.com" target="_blank"><img src="http://gbcannon.com/pics/misc/pixel.png" border="0"></a>latest update - debut of the cardapult

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Unread postAuthor: drunkii » Fri Jul 18, 2008 11:00 am

your sick dude
that gun owns!!!!
8)
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Unread postAuthor: The Engineer » Thu Nov 20, 2008 12:03 am

I've looked into this, and have come to realize that this is the most efficient valve on the website (so far as i can tell), at least for semi-automatic. I have been working on a design for a semi-auto airsoft gun for some time now. I know there are diagrams up, but I'm not sure I understand them.

Q1: If the trigger is held down, is it fully automatic?

Q2: How exactly does the trigger work?
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Unread postAuthor: MrCrowley » Thu Nov 20, 2008 12:53 am

The Engineer wrote:I've looked into this, and have come to realize that this is the most efficient valve on the website (so far as i can tell), at least for semi-automatic. I have been working on a design for a semi-auto airsoft gun for some time now. I know there are diagrams up, but I'm not sure I understand them.

Q1: If the trigger is held down, is it fully automatic?

Q2: How exactly does the trigger work?

A2: IIRC, the trigger is just a sear.
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Unread postAuthor: SEAKING9006 » Sat Nov 22, 2008 9:53 pm

Yeah, it is. He said the only thing keeping it semi-auto was trigger discipline. :lol:
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Completed projects:
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question

Unread postAuthor: lateral4 » Thu Mar 12, 2009 1:51 pm

do you have plans for your valve? I would love to make one.
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Re: question

Unread postAuthor: Hubb » Thu Mar 12, 2009 2:01 pm

lateral4 wrote:do you have plans for your valve? I would love to make one.


http://gbcannon.com/pics/GBSemi/gbsemi.gif

That's probably as good as it's gonna get.
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Unread postAuthor: Carlman » Thu Mar 12, 2009 2:09 pm

Every bloody time someone links to an old topic someone has to post in it.

Check the dates and spudfiles does not allow/condone asking for plans rather let you do your homework and find out for youself.

You would of found that site yourself had you of searched.
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Unread postAuthor: chrissilvermancs » Tue Mar 17, 2009 10:43 pm

i was looking at your animations and i cant figure out why the bottom bolt dose not want to go right (i am vary curious and im bacing a auto design on this but without springs) and i would think when the trigger is not down the piston shoot right through that little hole. please get back to me.
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