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4" Piston Valve

Posted: Mon Mar 17, 2008 4:51 am
by Novacastrian
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:
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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.

Posted: Mon Mar 17, 2008 5:13 am
by Cosmic Muffin
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?

Posted: Mon Mar 17, 2008 5:20 am
by Novacastrian
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:

Posted: Mon Mar 17, 2008 5:46 am
by Cosmic Muffin
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

Posted: Mon Mar 17, 2008 5:51 am
by psycix
Whoa that is a clean construction!
And your ammo is even more nice!

Had some fun with a lathe?? :)

Posted: Mon Mar 17, 2008 5:54 am
by SpudFarm
WOW i wonder what these bullets can do from a proper built hybrid :shock:
and 70m for a 400g protectile is AWESOME!!!

Posted: Mon Mar 17, 2008 6:09 am
by jackssmirkingrevenge
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?

Posted: Mon Mar 17, 2008 6:09 am
by pizlo
Damn could I convince you do make a tut on casting poly? please?

Posted: Mon Mar 17, 2008 7:22 am
by Mitchza89
:shock: .......................................................................

Yeah that says it all... God damn it dude... Well done.................

Posted: Mon Mar 17, 2008 8:13 am
by watto
very impressive

Posted: Mon Mar 17, 2008 9:05 am
by Rokmonkey
That....ammo....is....evil....


Great work, looks amazing!

Posted: Mon Mar 17, 2008 9:26 am
by Gippeto
Once again Nova, Very nicely done. :)

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

Leaking from the screws on the end-cap?

Posted: Mon Mar 17, 2008 2:47 pm
by Novacastrian
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

Posted: Mon Mar 17, 2008 2:56 pm
by pizlo
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?

Posted: Mon Mar 17, 2008 5:39 pm
by Novacastrian
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