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After many failures, tears, and dreams shattered, I finally managed to complete a working copper pneumatic. Its not the best, nor is it even pretty, but I am really proud that I finally conquered copper .
Chamber: 1" x 60" Type L Copper Tubing
Barrel: .68" x 72" 6061-T6 Aluminum Tubing
Valve: Copper piston valve, 1" inlet and 3/4" outlet. Piston is constructed from UHMW; exhaust valve is 1/4" Detrol QEV piloted by a 1/4" blowgun.
<a href="http://www.spudfiles.com/uploader/uploadFiles/ValveCopperPneumatic.JPG">Valve Detail</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/CopperPneumaticDownView.JPG">Downrange View</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/BarrelSupportCopperPneumatic.JPG">Barrel Support</a>
This cannon was built strictly for performance. The long paintball barrel, combined with a decent 1.8:1 chamber to barrel ratio, provides a great amount of power. According to GGDT, at 125 PSI with compressed air, this gun should be able to break 800 FPS. If I pump it up to 250 PSI, which is feasible due to the high pressure construction of this pneumatic, it will be able to break 1000 FPS. If I can get my hands on some helium... then the real fun begins .
I am actually somewhat surprised at how low the velocity figures are; I have seen many paintball cannons on this sight that also can get 800 FPS at 125 PSI; this is using 24" or under barrels that have a diameter of over .7"! For some reason, I think the owners might be a little optimistic on their figures... I am probably a bit optimistic myself.
I find this cannon to have a nice weight, even though it is extremely long. I plan to add a laser scope to it sometime soon, to make aiming easier. I might also add a breech loader in, because muzzle-loading a .68" paintball down 72" of .68" barrel is NOT fun at all.
I don't think that this cannon is complicated, so I doubt that there will be too many questions. I hope to get up a video within a week or two; I have a tennis tournament and a 25 page paper due within the next week or so; luckily my AP exams are over, so that frees up some time. I'm going to see if I can break some PVC pipe with frozen paintballs; it is probably unfeasible, but I have never played around with this type of power before, so its worth a shot .
Though its far from the best copper cannon, I am still really proud of it (trust me, success after multiple failures spanning over a period of nearly eight months feels REALLY good). If you have any questions, feel free to ask.
Thanks for looking.
PS: And yes, I am calling it a sniper, and I am calling it a rifle... though it does not have a rifled barrel. DEAL WITH IT
I like it! I think you should go and get a laser site ASAP, because they are totally cool and convenient.
Well, Steyr call this monster an Anti-Material Rifle in spite of its smoothbore barrel, so I guess you have every right
Nice work, and with those dimensions, I expect some killer high-velocity performance, so damage pics/vids s'il vous plait
wow... that is huge!! where do u store that thing lol.. u should have made interchangeable abrrels so u could store it somewhere hehe.. nice job rmich
4" piston valved cannon-half done..( i spilt my cement...)
Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
Congradulations for sorting the copper issues. Should have interesting performance.
Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
Great job on the construction, rmich! I knew you'd figure it out sometime.
I was interested in that aluminum barrel. How did you attach it to the gun? It looks like some sort of epoxy?
Does a paintball stay inact in a barrel that long?
Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
Thats a great looking cannon mate. Getting pistons to work at that size are so so tricky, I spent days trying to get my 3/4in to work but I just gave up. A job well done, I hope to see damage pics soon.
Thanks for the comments guys. I had no problems with the piston whatsoever. I popped it in the piston seat, and it worked flawlessly, with no changes necessary.
Mark, I used metal epoxy to hold the barrel in place. Considering that it is not holding any pressure, I feel completely confident that it will hold up to all abuses.
Paintballs so far have not popped in the barrel; the interior is very smooth, and I suppose the sudden rushing of air doesn't damage them.
I did some very limited testing today. I shot at 60 PSI and 90 PSI (the most pressure that I have ever used, oh boy ); i am almost up to your 300 PSI Mark . The performance was pretty solid, but my laser sighting wasn't working properly so I didn't get to shoot too much. At 90 PSI, it ripped a hole in a 2-liter bottle; not sure whether that is good or not for a paintball.
I thought this gun would be pretty quiet; it is VERY loud. I guess I have never taken a gun to such high pressure, but I can't imagine how loud a 250 PSI shot would sound!
I took 3 crappy videos, with the gun shooting at approximately 70 PSI each time. I don't think that I will post them, just because they are nothing spectacular; you here the gun fire, and then you see plastic bottles filled with water topple off of the platform which they were standing on.
When I make the real video, I will probably pump the compressor up to 100 PSI and make a few shots then. I'll probably shoot my old old math textbook (way back from the days of Algebra I ), a few better shots at bottles, plywood/particle board, and perhaps a piece of 4" SCH 40, just to see what happens.
you said your piston is made of UHMW what is UHMW? i have to disagree with you saying its not pretty i think a copper piston gun is beautiful. think the QEV exhaust is a bit overkill but if it works for you thats cool. very nice door by the way.
"Those who are different change the world. Those who are the same keep it that way"
your asking if ripping a hole in a plastic bottle with a paintball is good. its AMAZING. i couldnt go all the way through a plastic bottle with my 1000fps pellet gun. [/b]
UHMW is a type of polyethylene plastic that is light, pretty cheap, and easy to machine (this is what I have heard; I didn't do any machining on my piston).
The QEV is overkill, but I do not mind; it is only on there temporarily to get maximum power; it will soon be transfered to my newest pneumatic when it approaches completion (not for a while).
Even though I just finished this project, I want to start another one . I just enjoy building things, seeing how they perform, and then immediately moving on to another project to continue the cycle.
Is that fitting near the end of the barrel a compression fitting?
“He who controls the present, controls the past. He who controls the past, controls the future.”
The fitting near the end of the barrel is actually a male adapter. This barrel was intended to be used on a coaxial, but plans changed and I decided to use this barrel on this gun. While I could probably remove the male adapter through the use of my propane torch, I don't think it really looks back and I don't want to risk messing up any of the soldered joints or leaving ugly burn marks or sticky epoxy residue.
The paintball didn't go entirely through the plastic 2-liter bottle. It pierced through the front, but it could not pierce through the back of the bottle. If I used higher pressure though (250 PSI), I bet that I could shoot a paintball all the way through.
By the way, does anyone have any suggestions for things that I could shoot at? Nothing expensive though; this gun cost enough
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