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4" Piston Valve

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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4" Piston Valve

Unread postAuthor: Novacastrian » Mon Mar 17, 2008 4:51 am

This is a creation that i like to call "Boogaloo", It means fast in some giberish.(thanks Gipetto)
:D
That's right, a 4 inch "power house" with 33.7mm porting. It was designed to accept many calibres, from 33.7mm down to 6mm. It is around 1.5 litres.

I tried to pilot this with a 1/4" ball valve with no success, 1/2"ball valve does well though and makes it a loud mo-fo.
I operate this at around 95 psi.
Did i mention that it leaks? I could fix the leaks but i really can't be bothered with 10psi over 20 seconds. :roll:
Image
Boogaloo
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Front on- you can see the piston face...just.
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assortment of 33.7mm ammo.
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piston
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Bumper/endcap.
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Unread postAuthor: Cosmic Muffin » Mon Mar 17, 2008 5:13 am

OMG are you insane? :shock: that ammo looks like it could take out an elephant and im being serious there. that is soooo kool the bumper looks like ballistics gell what is it? :?. hehe i wish i had one of those :D how good is the range?
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Unread postAuthor: Novacastrian » Mon Mar 17, 2008 5:20 am

Hey Muff, the bumper is made from Polyurethane, as is the sealing face.
IDK about range, i lobbed a 400grm piece of metal today about 70metres at a 40degree angle, the recoil is really nice :P

The range of my similar sized combustion was around 100 metres max, i suspect with the right barrel and ammo i could achieve around 200 metres, a t 95 psi that is. :roll:
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Unread postAuthor: Cosmic Muffin » Mon Mar 17, 2008 5:46 am

Muff ay? lol nothing like a bit of humour amongst fellow Aussies
theat sounds pretty good do you rekon you could kill and elephant with that ?. nice gun it looks hell pro. onya buddy
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Unread postAuthor: psycix » Mon Mar 17, 2008 5:51 am

Whoa that is a clean construction!
And your ammo is even more nice!

Had some fun with a lathe?? :)
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Unread postAuthor: SpudFarm » Mon Mar 17, 2008 5:54 am

WOW i wonder what these bullets can do from a proper built hybrid :shock:
and 70m for a 400g protectile is AWESOME!!!
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 17, 2008 6:09 am

Very nice, though again, shame about the small chamber. where does it leak from, barrel or endcap? If it's from the barrel, why not just bolt on a neoprene disk to the piston the old fashioned way?
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Unread postAuthor: pizlo » Mon Mar 17, 2008 6:09 am

Damn could I convince you do make a tut on casting poly? please?
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Unread postAuthor: Mitchza89 » Mon Mar 17, 2008 7:22 am

:shock: .......................................................................

Yeah that says it all... God damn it dude... Well done.................
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Unread postAuthor: watto » Mon Mar 17, 2008 8:13 am

very impressive
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Unread postAuthor: Rokmonkey » Mon Mar 17, 2008 9:05 am

That....ammo....is....evil....


Great work, looks amazing!
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Unread postAuthor: Gippeto » Mon Mar 17, 2008 9:26 am

Once again Nova, Very nicely done. :)

I see you have LARGE caliber pimpin ammo too. :D

Leaking from the screws on the end-cap?
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Unread postAuthor: Novacastrian » Mon Mar 17, 2008 2:47 pm

Thanks for the comments guys. Pizlo i would make a tutorial, however i am not even sure that you can buy the same Poly as i use.
As for the leaking i don't think that the sealing face is leaking, i'll check today. The other leaks are from the endcaps and will be fixed when i can be bothered :P
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Unread postAuthor: pizlo » Mon Mar 17, 2008 2:56 pm

Even if you could make a tut on the molds, and casting process, I'm sure it would be appritiated. what polly do you use, and what type for the white parts?
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Unread postAuthor: Novacastrian » Mon Mar 17, 2008 5:39 pm

I use different hardness Poly for different applications
http://www.erapol.com.au/# There is a link with more info.
As for the white plastic it is Acetal, a hard plastic that is easy to machine.

JSR went to a great deal of trouble making a tutorial for casting Epoxy, the same methods can be used to cast the Poly. (And it gets me out of making a tutorial) :D
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Last edited by Novacastrian on Mon Mar 17, 2008 8:31 pm, edited 1 time in total.
America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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