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Is this a good idea for my first?

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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Is this a good idea for my first?

Unread postAuthor: Jack_Hogg » Sat Mar 08, 2008 4:17 am

Well, i'm going to make my first pneumatic 8)
So, yea.. do guys think that this is a good idea??
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I'm worried about the trigger mechanism.. How should i make the trigger mechanism?

comments are welcome
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Unread postAuthor: Hubb » Sat Mar 08, 2008 4:23 am

It looks like a coaxial, correct? It can probably be piloted by a blowgun.
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Unread postAuthor: Jack_Hogg » Sat Mar 08, 2008 4:25 am

How? (i'm not experienced in pneumatics..)
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Unread postAuthor: MrCrowley » Sat Mar 08, 2008 4:28 am

Did you draw that? I just find it hard to believe that you drew that and your not experienced in pneumaitcs.
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 08, 2008 4:29 am

hubb017 wrote:It looks like a coaxial, correct? It can probably be piloted by a blowgun.


I don't think it's a piston valve, if I understood correctly the trigger directly "pulls the plug" from the barrel - in which case it would work nicely, if you could guarantee an airtight fit where the trigger bolt meets the endcap.
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Unread postAuthor: Hubb » Sat Mar 08, 2008 4:34 am

I see now.

Put more into it and add a stock and it should be easier to pull.
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Unread postAuthor: Jack_Hogg » Sat Mar 08, 2008 4:54 am

Allright, so.. when i seal the endcap where the trigger is, is it all fine?

(thnx all for helping me)
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Unread postAuthor: BigGrib » Sat Mar 08, 2008 5:59 am

Image

would you explain what the red piece in between the barrel/endcap and the trigger mechanism. it is labelled as a machined part so i'm assuming that it seal against the wall. is it just a guide for the trigger rod or what?

Also how would you access the trigger assembly for maintenece and adjustments?
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Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
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Unread postAuthor: Jack_Hogg » Sat Mar 08, 2008 6:49 am

BigGrib wrote:
would you explain what the red piece in between the barrel/endcap and the trigger mechanism. it is labelled as a machined part so i'm assuming that it seal against the wall. is it just a guide for the trigger rod or what?

Also how would you access the trigger assembly for maintenece and adjustments?


The right red part near the endcap is just a guide for the trigger rod. And if you assemble it all together, you probaly cant maintenece or adjust it. So, is it a good idea? or do you have other plans? (thnx for helping me)
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Unread postAuthor: lockmanslammin » Sat Mar 08, 2008 11:28 am

if you look around in here http://www.spudfiles.com/forums/viewforum.php?f=1&sid=8a02e512de08dae43800a994b8ec0a0a you will see that you are making something rather un-ordinary. Like JSR said it would work...it works on paper. But a barrel sealing piston or a sprinkler valve would probably be easier. If your making that small of a caliber I would say stay away from a sprinkler valve as you will need some serious pressure to get that small of a projectile to do anything impressive, and sprinkler valves just can't handle real high pressure. This design could handle some good pressure if you use metal for all the parts, and good strong connections. High psi air can be a bit dangerous so be careful.

another thing I noticed is that when you pull on the trigger you will be putting a sideways load on the spring and bolt mechanism. This part is going to be the biggest challenge so seal well. Maybe you could design a lever kind of like on a grease gun to link the trigger to the bolt, so that you would have a straight pull on the bolt. I drew a real quick drawing for the idea.


Good luck, Lock
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Unread postAuthor: BigGrib » Sat Mar 08, 2008 4:29 pm

I think that if you were to put everything together with screw together fittings i think you'd be good. maybe rework the trigger mechanism a little bit make it slide smoothly.
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: pizlo » Sat Mar 08, 2008 5:19 pm

I don't see why you would make this instead of a standard piston valve, but whatever.
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Unread postAuthor: Jack_Hogg » Sun Mar 09, 2008 10:59 am

Well, then i am going to make this as my first:
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