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Pistonsss

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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Pistonsss

Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 9:03 pm

Im gonna make a barrel sealing piston gun, vent it with a blowgun.

THe piston will only be 40mm so that would be okay for venting.


My question is, what do i do with the T? do i put 40mm pvc in it so the piston has a smooth surface with no lumps in it?

what about the third socket? that would be covered from the pipe.

thanks
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Unread postAuthor: Rudesill Ballistics » Thu Sep 06, 2007 9:14 pm

One socket is the barrel/outlet, the opposite socket is the pilot (hook another valve to this part), the third socket is connected to your tank/chamber.

Your piston must seal against the barrel port if it is a barrel sealer.
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Re: Pistonsss

Unread postAuthor: MrCrowley » Thu Sep 06, 2007 9:26 pm

Mr.Russ wrote:Im gonna make a barrel sealing piston gun, vent it with a blowgun.

THe piston will only be 40mm so that would be okay for venting.


My question is, what do i do with the T? do i put 40mm pvc in it so the piston has a smooth surface with no lumps in it?

what about the third socket? that would be covered from the pipe.

thanks


I suggest you learn your piston valves a bit better before starting out.
Read <A HREF="http://www.spudfiles.com/forums/how-to-make-a-pneumatic-cannon-with-a-2-piston-valve-t10381.html">This</a>
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 10:31 pm

thanks mrcrowley that helped alot.

im going to make one like that but with a marble barrel and a 2" chamber.

My deodorant can has about 2mm difference to the ID of my 2" pipe. could i just wrap it in tape to make the difference?
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 10:39 pm

You could, but it could jam up after awhile, do you have Lynx over there? My can is actually from some foot spray stuff, I figured it fit slightly better then a Lynx can.

Lynx is a pretty good fit, it slides so well it builds up pressure and when you let it go, it flys out the pipe...Good times :P
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 10:41 pm

yehh we have lynx over here. i think this gap is to big. i can get a photo for you if ya want..
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 10:50 pm

Hmm thats weird, what pipe ya using? Im used 50mm PVC PN12, maybe your has a different pressure rating.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 10:57 pm

i wouldnt have a clue what the pressure rating is, bought it at bunnings they just said it was pressure pipe.

after i think about it its not that much of a difference. heres the can pushed completely to one side of the pipe
Image



also - about the sealing face. do you know if the material underneath mouse pads are alright? if they seal? someone on here said they used that.
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:02 pm

The mouse pads can be to porus, in other words, to foamy, they can leak air into the barrel. Just go to bunnings and pick up a rubber gasket(usually black or orange) and get the thickets one you can find.

Check the pipe, it should have PNXX on it, the XX is where a number will be, like mine is PN12, PN12 = Pressure Number 12 BAR, which is around 175psi.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:15 pm

okay. i only have 25cm of the pipe left.. was going to use that as the chamber is that enough?


ill check the other part of it on my gun too.
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Last edited by Mr.Russ on Thu Sep 06, 2007 11:20 pm, edited 2 times in total.
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:18 pm

Yeah it should be fine for marbles.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:21 pm

I checked it, this part of the pipe has no writing on it.

Image

Thats my design.. pretty similer to yours but its a basic version.
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:22 pm

Yeah that should be fine, You may have a bit of trouble piloting with a blow gun, but you can try, I recommend at least a 10mm ball valve.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:29 pm

alright. i wanted the blowgun there because its more trigger like, when i twist a ball valve i seem to move the cannon, and sometimes miss a target(uh-oh)

Do you know what brand your pipe fittings are?
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:31 pm

Yeah I know what you mean, hook it up with a spring maybe, or mod your blow gun, but it may not be enough.

I think marley, can't remember , it shouldn't matter.
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