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Blowbackwards Bolt?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Blowbackwards Bolt?

Unread postAuthor: sagthegreat » Sun Jul 15, 2012 6:28 pm

Here is a concept that i was dreaming up in math class a few months back. Please give me some feedback, thanks :D


The gun is supposed to work in full auto but i figured that making it work will be a challenge
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srry for bad quality
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Unread postAuthor: Goats spudz » Sun Jul 15, 2012 7:02 pm

It Probably won't cycle in Full auto, semi is Possible but it may need some tweaking, Most likely scenario is that it jams.
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Unread postAuthor: sagthegreat » Sun Jul 15, 2012 8:05 pm

I figure that the back o-ring has to be weaker then the front one because the back has the spring force too, and because you need them both to blow at the same millisecond to cycle properly.
The beauty of this is that you can use a needle valve and make the flow small for a smaller rof, without sacrificing power
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its based of this in JSR's insanely cool cartridge fed gun thread
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 16, 2012 12:31 am

It should work but you will need HPA, I gave this a go with compressor pressures and there wasn't enough force to overcome the o-ring friction.
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Unread postAuthor: sagthegreat » Mon Jul 16, 2012 7:55 am

so we are talking about like 450 psi, and how would i be able to change the spring force if adjustments are needed
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Unread postAuthor: beastmode986 » Mon Jul 16, 2012 11:58 am

LOL at my school i had my notebook confiscated and the principle called me to his office for drawing a hammer valve! just the valve too. I told him he was overreacting and that its used in my pneumatic projects and demanded my notebook back.
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 16, 2012 12:32 pm

sagthegreat wrote:so we are talking about like 450 psi, and how would i be able to change the spring force if adjustments are needed


450 psi should be enough. as to an adjustable spring, you can either have a threaded endcap, or one with multiple holes that would allow you to insert a holding pin at various stages to adjust travel and tension.
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Unread postAuthor: sagthegreat » Mon Jul 16, 2012 12:39 pm

Now im wondering if anyone has even attempted this mechanism or have any tips on construction?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 17, 2012 12:28 am

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Unread postAuthor: sagthegreat » Tue Jul 17, 2012 11:38 am

JSR, you said you tried it, did it have any significant power?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 17, 2012 3:13 pm

sagthegreat wrote:JSR, you said you tried it, did it have any significant power?


Enough to punch through a soup tin but not incredible, but then again unless you're using HPA any small calibre launcher is going to be marginal.
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Unread postAuthor: sagthegreat » Tue Jul 17, 2012 5:02 pm

Do u happen to have a video, some motivation would be helpful, cuz mine wont work :roll:
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 17, 2012 11:47 pm

There are some target videos in the valveless cartridge thread ;)
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