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Auto piston valve + realoading system (BB cannon example)

A place to ask general spud cannon related questions.
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Unread postAuthor: al-xg » Fri Oct 26, 2007 5:10 pm

There wouldn't be much left of the design if you take the autofire and autoloader off :)

And, I already have one of those ;)
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Unread postAuthor: Hawkeye » Fri Oct 26, 2007 5:10 pm

I'm not sure how well that piston will reset with air coming in the front chamber.
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Unread postAuthor: al-xg » Fri Oct 26, 2007 5:19 pm

That will have to be set, buy choosing the right spring or diametrer of the air inlet tube.
There are quite a few working chamber filling piston valves about, so it should be feasible.
I did have a system to shut off the air when the piston was back on the first diagram but it required a length of tube that fitted into the chamber...
If such a system is needed it could be done, but it would just be easier if it wasn't...
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Unread postAuthor: ALIHISGREAT » Fri Oct 26, 2007 5:21 pm

yes but pump actions are just so cool!
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Unread postAuthor: origin unknown » Sat Oct 27, 2007 12:17 am

This is like a compiltation of all the great pneumatic autoloaders. Nice drawings. What all do you like to draw?
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Unread postAuthor: al-xg » Sat Oct 27, 2007 6:50 am

Things with details :)
I have tried drawing a few otherthings too (people, things and places...) but not very often...
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 27, 2007 6:57 am

al-xg wrote:Things with details :)
I have tried drawing a few otherthings too (people, things and places...) but not very often...


same here, as a teenager i used to love drawing warhammer style drawings, like this space marine terminator armour:
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Unread postAuthor: dauphinoise potato » Sat Oct 27, 2007 7:21 am

Did you draw that jsr?

I have tryed to draw my dog, but he's allways on the bloody move...
I can draw birds pretty well though, haven't done so in a while now.
I remember in year4 at my primary school I went through a phase of drawing smoking animals (horses, dogs, pigs, birds and cows) the teachers must have been quite worried, lol.


Nice design btw :)
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 27, 2007 7:25 am

yep, I was studying art and theatre at uni before I decided "screw you guys, i'm getting a job" :D
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Unread postAuthor: Marco321 » Sat Oct 27, 2007 8:12 am

I couldn't draw, I'm not joking, i think it actually hurts people when i draw... I can draw diagrams of a spudgun or a valve concept or something on the computer though.
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Unread postAuthor: sandman » Sat Oct 27, 2007 8:35 am

i cant draw like marco, so i decided to 3D model :)
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Unread postAuthor: someguy411 » Fri Feb 13, 2009 1:20 pm

well, the only problem would be the barrel running inside the chamber, because it will have alot of force exerted upon it, and the failing point would be the seal around the barrel, because evrytime the piston actuates, it'll be like hitting the barrel with a hammer, and if it is not properly oversealed, one day, the thing will actuate the entire barrel, probably flying six feet, before hitting the ground.... that is, of course, if you use HPA, or those high-prerssure systems... this could be dissapated through using a lower pop off psi... but other than that, perfect all around.. 8)
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Unread postAuthor: jackssmirkingrevenge » Sat Feb 14, 2009 3:17 am

someguy411 wrote:well, the only problem would be the barrel running inside the chamber, because it will have alot of force exerted upon it


There have been countless pneumatic launchers built with the barrel inside the chamber, what we call co-axial designs, and I've never heard of barrel failure in the manner you described, so it should be quite safe ;)
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Unread postAuthor: someguy411 » Sun Feb 15, 2009 2:13 pm

a.k.a. having them explode on me... I have already made five coaxicals, and each and every one broke on me... so please, don't pull that one on me... :roll: I think I talk from expirence when I say this....
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Unread postAuthor: Gippeto » Sun Feb 15, 2009 4:14 pm

Having none of mine go "boom" in any way other than designed, (Six for six, so far anyway.) I THINK I do as well. :)

Calculate the forces/strengths involved, and adjust the joint to have an adequate level of safety.

I won't comment on your 5 out of 5 build/fails.

Or did I just do so? :wink:
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