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My very first piston cannon :)

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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Is this a decent result for a first pneumatic?

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My very first piston cannon :)

Unread postAuthor: hyldgaard » Mon Oct 22, 2007 6:29 am

So, basicly i was inspired by the spudfiles coinchallenge to make a smaller diameter gun than i had tried before, with enough power to punch a dart through a coin. With some help on this forum i got pointed in the right direction and decided to go for a copper cannon with a 110cm 15mm barrel, with an ID of 13mm. My plan was to use a 1/2" or 3/4" qev, but due to the circumstances, i had to go with a homemade piston valve.
My thoughts on chamber was also copper, in a over/under construction, but the largest diamter copper i could get my hand on was 15mm, same as the barrel. And as i wanted a CB ratio a bit higher than 1:1 I had to figure something else out. The pop bottle is temporary till i get some 1" nipple pipe and the right fittings.
I use a blowgun for piloting, and i usually fire it at 85-90psi as thats the highest my dads compressor would go.
The unusual plug on the pilot tee is a replacement till i get a pressure gauge (borrowed one, but had to give it back after two days).
All in all not exactly the "final version" of this gun, but since i could only use my dads shop for one week, I had to put the parts together that I had :)
As a final note, this is my first pneumatic launcher so go easy on me :wink:
Well, enough talking, if you have any questions just ask.
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Attachments
IMG_1730.JPG
The cannon
IMG_1734.JPG
The darts I'm using.
IMG_1735.JPG
A better view of the darts
IMG_1736.JPG
The point of this gun ;) used a slightly different dart, but quickly found some larger nails as these ones tend to bend a lot on impact.
IMG_1738.JPG
Some breech-loading thing i didnt have time to finish. Will probably be finished and added to the gun next time i visit my parents.
IMG_1749.JPG
IMG_1751.JPG
IMG_1757.JPG
half-done piston
DSC02666.JPG
one of the large darts lodged in the "backstop"
DSC02663.JPG
made som large darts just for the fun of it
DSC02679.JPG
spud- wax-and epoxy-slugs shot at a sheet of thin chipboard-like material at different pressures
DSC02680.JPG
spud- wax-and epoxy-slugs shot at a sheet of thin chipboard-like material at different pressures
DSC02683.JPG
shot at about 5m, or 16,4 feet without any sights mounted.. yet.
Last edited by hyldgaard on Mon Oct 22, 2007 1:47 pm, edited 2 times in total.
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 6:41 am

That looks like a good clean construction. Thats very nice gun i like it alot. Any chance of getting some pictures of the piston?
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 6:48 am

sure thing, will be added to the original post in a couple of secs :wink: it's made from 18mm copper pipe, wich is a perfect fit inside a special fitting i put inside the valve tee (i dont know the name, but its the same as i used for the breech loading)
The picture however is not the piston in its final stage, but without the sealing face. The sealis made from a layer of very thick and double side sticky tape, and a layer of some other kind of very durable tape my dad had laying around :)
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 6:51 am

Thats a nice looking piston, it will look great when it is complete.
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 6:54 am

Yea i hope so, but unfortunately I wont be able to finish it before im visiting my parents again, which will be around christmas :? but hey, that gives me a lot of time to think about what i want done :wink:
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 6:58 am

Oh ok thats unfortunate. Do you have the gun with you know? or is it left at your parents.
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 7:02 am

Left at my parents. as you have probably noticed, i have no filling valve mounted except for the back of the blowgun, so it can only be filled with a compressor. But as a lot of other things, thats just a matter of time ;)
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Unread postAuthor: Marco321 » Mon Oct 22, 2007 7:05 am

hyldgaard wrote:Left at my parents. as you have probably noticed, i have no filling valve mounted except for the back of the blowgun, so it can only be filled with a compressor. But as a lot of other things, thats just a matter of time ;)


Oh ok i see. I'm looking forward to seeing it finished and many more of your guns :P
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 7:09 am

I probably wont be doing a lot of guns, as i dont have the time or the tools/space myself. But i will keep you updated when i complete/add things to this gun. :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 22, 2007 7:18 am

Nicely done and after only limited advice, great stuff :) damage pics!
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 9:45 am

Thank you very much :) i dont really get whats the big deal about the making of these piston valves, but maybe i was just lucky :lol:
i have a couple of damage pics on my mobile, will upload them later when i find my mobile>computer cable.
found a great way of making those darts btw, but i dont feel like using a lot of my time describing it if people doesnt care, youre welcome to ask for details ;)
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Unread postAuthor: ALIHISGREAT » Mon Oct 22, 2007 9:56 am

very nice darts and cannon but i would switch the coke bottle chamber for copper and pump it up to 200psi :twisted:
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 10:03 am

As said earlier, the camber will be changed next time i have acces to the gun. Though not to a copper one, as 15mm is the largest diameter pipe i have acces to.
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 22, 2007 12:20 pm

i dont really get whats the big deal about the making of these piston valves


It really isn't that hard if you had the right materials, but many people seem to find the prospect of making your own valve as opposed to screwing in an off-the-shelf item to be rather daunting. Glad you weren't put off :)

How do you keep your darts stable in the barrel, as they're not supported from the front? Or do you just let them scrape along the sides of the barrel?
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Unread postAuthor: hyldgaard » Mon Oct 22, 2007 12:44 pm

I just let them scrape along the side of the barrel. My intention was to make some test darts with two sets of "fins" but never found the time.
Even though i just let them scrape, accuracy seems to bee fine. i didnt get to test it at distance due to lack of proper backstop, but at about 5 meters i was able to put 5 darts within a circle of 5 cm, with the very accurate "point and shoot" technique :lol:
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