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.25 Air rifle, Breech loaded, rifled barrel

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: ansen6606 » Tue Jul 19, 2011 11:21 pm

ok thx man
:P
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Unread postAuthor: jazzman56 » Wed Jul 20, 2011 1:02 am

What's is a slide valve, and how does it work in relation with a QEV. What type of slide valve do i get to work with this: http://www.ebay.com.au/itm/Pneumatic-3-4-Screw-Type-Air-Quick-Exhaust-Valve-/150633359512?pt=AU_Business_Industrial_Industrial_Supply_MRO&hash=item231272a898

My air supply will come from a 50mm galvanized steel pipe (as a stock)
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 20, 2011 1:25 am

jazzman56 wrote:What's is a slide valve, and how does it work in relation with a QEV.


Basically something like this:

Image

When the valve is in the forward position, it allows air to flow from the main supply to the QEV and fill the pilot and firing chamber.

When the valve is in the rear position, two things happen:

- main supply is cut off

- QEV pilot chamber is open to the atmosphere, emptying it and firing the launcher

The valve goes back to the forward position (you need to add a spring or do it manually) and the cycle can be repeated.

Here's a nice 3/4" slide valve: http://cgi.ebay.com/Deltrol-SL35-3-4-Sl ... 2eb4b3739c

You could also get a cheaper 1/8" one and use an adapter: http://cgi.ebay.com/New-Paintball-Gun-S ... 2c5cefe367
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Unread postAuthor: cacob_jlarke » Tue Oct 18, 2011 9:46 pm

hey mate, love the design on it
I'm from Australia too, got myself a soda stream canister and I machined a hammer valve too, but what I wanna ask is where the heck do you get .25 steel tubing?
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Unread postAuthor: Zeus » Tue Oct 18, 2011 9:56 pm

cacob_jlarke wrote:But what I wanna ask is where the heck do you get .25 steel tubing?


I don't know about steel, a steel supplier would be the way I'd go, but for brass and aluminium tubing I'd go to a hobby shop or Toyworld. I won't be buying 4.5mm ID aluminium for a while since I picked up 15 meters for $15.

Can I ask what state you're in?
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/sarcasm, /hyperbole
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Unread postAuthor: jazzman56 » Wed Oct 19, 2011 12:56 am

Zeus, any chance of getting some of that 4.5mm Aluminium off you?
I have looked everywhere to find 4.5mm ID but still haven't found anything suitable yet.:(
N.S.W
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Unread postAuthor: cacob_jlarke » Wed Oct 19, 2011 1:43 am

yeah there isn't too much to offer here
N.S.W Newcastle
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Unread postAuthor: POLAND_SPUD » Wed Oct 19, 2011 3:36 pm

ImageWhy not add a loading mechanism there ??

w8 a sec. got to use MSpaint
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Attachments
valve&loadingmech.PNG
I didn't have patience to modify that one i made a new one:
a coaxial pnuematic
valve&loadingmech.PNG (8.12 KiB) Viewed 1688 times
Children are the future

unless we stop them now
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