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First Pneumatic made by me and integral

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: chaos » Tue Apr 03, 2007 8:27 am

shotgun wads


oh yer good idea mate. then with them you could use just about anything that would go down your barrel.
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Unread postAuthor: locksmith » Tue Apr 03, 2007 11:12 am

nice weapon needs a good cleaning and paint job
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Unread postAuthor: joannaardway » Tue Apr 03, 2007 11:53 am

There is quite a difference between 12 gauge (.72") and 20mm (.79"). But I don't know exactly how big the wad is... so ignore me on that count
Actually, 20mm is close to what 9-gauge would be if it were used (I don't think it is).

The best wadding I've seen is cut up plastic bags. Non-porous, free (for you at least) and exceptionally lightweight. Scrunched up, it is nearly perfect for fairly small bores. (It might be usable up to 2" if you wanted).
Loo roll is usable too, but not quite as good, as it's heavier and porous.

Both are also good for firing at smaller siblings from a small distance away (not at close range though. I've seen bits of loo roll go 2 or 3 inches into bag of compost at point blank). Wait, we're not allowed to say that - crap.

Of course, using either in a combustion rather than a pneumatic is rather less convient as they both burn very freely.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: integral » Tue Apr 03, 2007 8:22 pm

glad everyone likes it. will set up a series of mics to record muzzle velocity for you viewing pleasure soon. we will even calculate it in fps for all ur imperialist spudders. lol will also post a vid at full pressure too. this thing is fast. dad didnt think it would work... till we shot it. now he doesnt want anything to do with it cause he thinks the cops will come round. such a party pooper.

@ 100psi... all we see is a big ruffle of grass behind the target. and yes chaos, we will shoot the solenoid (with a lead sinker) once we have some eproxy just for u. all u will see is probably a sudden spray of plastic and metal shrapnel though LoL.

EDIT:
Thunder Gnome wrote:Hey man I live in Tassie, where did u get the tire valve from, i've checked ebay and all the shops and can't find one, could you salvage one from a bike tire tube, and how much would i expect to pay for the blowgun?

Cheers.

P.S....... The button on your shorts is un-done. hauhauhaha. PEACE!


dude we picked up the neato scharader from the local bridgestone tire store. just check any of the tirefitting shops around u and they will sure to have em. u wouldnt have much luck getting em from an old bike tube since they are used for truck tires and such. ask for chrome schrader valves, and be sure to buy the one that is bolted from the outside (incase it gets loose). cost us $4.50AUD.

as for the blowgun... it was on sale from supercheap auto for round $5AUD. quick go now before the sale ends!
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 03, 2007 9:33 pm

joannaardway wrote:There is quite a difference between 12 gauge (.72") and 20mm (.79")


Granted, but nothing a little masking tape can't solve :wink:
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Unread postAuthor: Thunder Gnome » Wed Apr 04, 2007 4:37 am

It's Acorn season here in australia! I've found they fit awesome into my 20mm barrell (thats all i've got of my pneumatic at the moment) Collect them and shoot them :wink:. Thanks for your help man, theres a Bridgestone centre like 200 metres from my house!! Cheers.
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Unread postAuthor: integral » Wed Apr 04, 2007 6:50 am

acorn it is then :D GL hunting that shcrader d00d and keen to see ur cannon :p
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Unread postAuthor: Thunder Gnome » Wed Apr 04, 2007 7:35 pm

I found all the stuff today which is sick. :P
Do you loose any power with the breech loading mechanism?
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Unread postAuthor: Thunder Gnome » Wed Apr 04, 2007 8:36 pm

Hey guys, just went out and bought a sprinkler valve, theres a little pin that comes out of the lid and goes down into the valve ( when the lid is on). Is this going to be a problem? could i just drill a hole next to it? Any help appreciated.
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Unread postAuthor: mopherman » Wed Apr 04, 2007 8:51 pm

yes. just make sure you dont block any moving parts
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Unread postAuthor: pyrogeek » Wed Apr 04, 2007 9:10 pm

joannaardway wrote:There is quite a difference between 12 gauge (.72") and 20mm (.79"). But I don't know exactly how big the wad is... so ignore me on that count
Actually, 20mm is close to what 9-gauge would be if it were used (I don't think it is).

The best wadding I've seen is cut up plastic bags. Non-porous, free (for you at least) and exceptionally lightweight. Scrunched up, it is nearly perfect for fairly small bores. (It might be usable up to 2" if you wanted).
Loo roll is usable too, but not quite as good, as it's heavier and porous.

Both are also good for firing at smaller siblings from a small distance away (not at close range though. I've seen bits of loo roll go 2 or 3 inches into bag of compost at point blank). Wait, we're not allowed to say that - crap.

Of course, using either in a combustion rather than a pneumatic is rather less convient as they both burn very freely.

My cheap digital calipter (from Harbor Freight) is being a pain, but I measured an unused 12 gauge wad and it was about .711 inches. They run about $6US for a bag of 250, by the way. And the back of the wad could be cut off from the front, so you could really have two.
By the way, don't buy electronic stuff from Harbor Freight. It is really bad quality.
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Unread postAuthor: integral » Thu Apr 05, 2007 1:33 am

Thunder Gnome wrote:Hey guys, just went out and bought a sprinkler valve, theres a little pin that comes out of the lid and goes down into the valve ( when the lid is on). Is this going to be a problem? could i just drill a hole next to it? Any help appreciated.


i think ur talking about the guide rod. some say that are a pain in the ass but it is really not that much harder than other valves to mod. just offset the barb away from the rod, giving room for the barb to be inserted without touching any of the phram or rod. if like us, u will have to insert the barb on an angle, but some of the caps plastic gets in the way. best way around this is to drill the biggest pilot hole u can, and gradually increasing the bit size to ur barb, use a wrench or something to turn the bit by hand. this way u wont munt the cap by accidentally cracking it or taking out the rod.

when u drill the hole, think out where it should by with reference with ur configuration and trigger set up. and remember to use plenty of teflon!


ok now for another quick video:

[youtube]http://www.youtube.com/watch?v=nHn_nKEc-Lw[/youtube]

enjoy! sorry about the lame-o voice.

EDIT: i dont seem to notice any lack in power from the breech. its pretty tight, cept there is a little air escaping from it, u hardly notice :D but then again, how would i know, batteries just fly so fast :P
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Unread postAuthor: gattlinggun » Fri Apr 06, 2007 3:34 pm

wow great job! looks powerfull.
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Unread postAuthor: Thunder Gnome » Thu Apr 12, 2007 9:44 pm

Hey again dudes, Could you have the sprinkler valve right after the chamber instead of on top before the barrel? would that decrease performance at all?
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Unread postAuthor: integral » Thu Apr 12, 2007 10:14 pm

it would only decrease the volume of the chamber. it would only decrease performance if the volume of the pipe leading from the valve to the barrel is large, other than that it should be fine.
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