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Building a new cannon

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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Building a new cannon

Unread postAuthor: maggotman » Tue Dec 23, 2008 6:56 pm

ok im sure if you seen my last cannon it was a bit getto and looked crap

so heres the start of the new one

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the valve


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modified reducer left standard one right

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modified reducer fits nicely in the 2inch bit

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please comment
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Unread postAuthor: starman » Tue Dec 23, 2008 7:05 pm

That's a really beastly setup you have there. If you have the piston dialed in, it should be a very good performer as well.

What plans do you have for ammo, barrel length etc?
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Unread postAuthor: psycix » Tue Dec 23, 2008 7:06 pm

Looking good! Complete the black paint job on the chamber.
I like the shiny new fittings!

-What are you going to use as piston?
-Do you trust your welding job enough for high pressures?
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Unread postAuthor: Cosmic Muffin » Tue Dec 23, 2008 8:02 pm

that thing looks like it could put a fair hole in someone...
you could get a whole lot of power for it too, cos your using a high pressure bottle, could take it up to around 400 psi?
Starman would know, haha hes like a bloody walking encyclopedia.
but yeh looks good. pilot the piston with a modded solenoid valve and she'll be a beauty.
:wink:
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Unread postAuthor: maggotman » Tue Dec 23, 2008 8:23 pm

psycix wrote:
-What are you going to use as piston?
-Do you trust your welding job enough for high pressures?


the paint was just to stop it going rusty will paint it when finished

unsure of the piston i did have an old bike piston out of my bike but it is f**ked from slamming into the end cap

i have filled it with water and pumped it up to 350 with a shock pump
and it did not fail i got good penetration wen i welded it and went over it 3 times

i plan to vent the valve with another one like this
Image
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Unread postAuthor: psycix » Thu Dec 25, 2008 7:06 am

What will the operating pressure be?
You should test it to at least 150% the operating pressure if you want to be safe. 200% or higher would even be better

but it is f**ked from slamming into the end cap

You had a bumper?
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Unread postAuthor: SP00K » Thu Dec 25, 2008 2:39 pm

Lol, looks good, but still looks pretty ghetto.
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Unread postAuthor: maggotman » Thu Dec 25, 2008 3:02 pm

i did not have a bumper
i have now got a fridge compressor so can it up to 600psi

providing the welds are stronger than the material what would any of you say it would take the brass fittings the tank? i could fill it up to 600psi if i wanted
but i think the police would be around my house pity darn fast if i let it off and
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Unread postAuthor: maggotman » Fri Dec 26, 2008 7:10 am

fired it today it was crap i think the culprit is the piston valve ?
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Unread postAuthor: ALIHISGREAT » Fri Dec 26, 2008 10:52 am

maggotman wrote:fired it today it was crap i think the culprit is the piston valve ?


we'll need pics of the piston, it could be the pilot too, i reckon to get good performance, you'll need a 1/2" QEV to pilot.
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Unread postAuthor: maggotman » Fri Dec 26, 2008 1:57 pm

found the culprit air was leaking around the piston
washes and nuts and bolts i ditched that idea ive cast a piston out of 2017 arodite should i fill any dead space behind the piston or not bother ?
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Unread postAuthor: Moonbogg » Fri Dec 26, 2008 2:15 pm

LOL thats a friggin total beast. Awesome. Also, I wish I was good at welding. I know how as I took classes, but...
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Unread postAuthor: ALIHISGREAT » Fri Dec 26, 2008 2:48 pm

maggotman wrote:found the culprit air was leaking around the piston
washes and nuts and bolts i ditched that idea ive cast a piston out of 2017 arodite should i fill any dead space behind the piston or not bother ?


you could fill some excess pilot volume with a bumper.
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Unread postAuthor: maggotman » Fri Dec 26, 2008 5:51 pm

Moonbogg wrote:LOL thats a friggin total beast. Awesome. Also, I wish I was good at welding. I know how as I took classes, but...


i got a stick welder when i was 16 my mum wouldn't let me have one before ive just turned 17 but i still find it hard if ime not in the right mood or it turns out ugly and loads of slag inclusions

i think ive found the perfect bumper

has any one got any ideas what the max pressure the brass fittings would take
the gass tank its good up to 35 bar 500psi ish so it says and is in good condition no rust

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i will probably have the trigger on a hose or use a solenoid valve and incorporate one for filling aswell

one of my pices of ammo 25mm hot rolled bar it is about 0.5kg
some tape will be in order to achive a better fit in the barrel

Image
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Unread postAuthor: potatoflinger » Fri Dec 26, 2008 8:12 pm

I think your problem is the pilot, that blowgun is probably not a good enough pilot valve. As was already mentioned above, you should upgrade to a QEV or small piston valve as a pilot.
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