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Chamber placement.

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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Unread postAuthor: warhead052 » Thu Mar 24, 2011 10:33 am

@Ilovefire That looks like an ok design, I would just need alot of time and patience... Also guys, correct me if this wouldent work, but what if I cut the wrench grips off of a bushing, and cut holes into it as a support for a coax? That way I know its perfectly centered...
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Unread postAuthor: mark.f » Thu Mar 24, 2011 10:40 am

I've seen people do it before. Some PVC bushings usually have a bunch of ribs up front and a thin wall at the back, so you could cut the bushing from the back and leave just the ribs, outside edge, and inside coupling. Of course, smaller bushings like this are harder to find, so you'll probably wind up having to drill holes anyway. I have been building many a valve and accidentally grabbed these types of bushings (you can't trim them to length since the back wall is pretty thin), and had to make another trip to another store to get the solid type.

Find a bushing to fit your pipe is another matter. You could hammer a piece of dowel into the inside part of the bushing and use a 2" hole saw to trim the bushing to fit the 2" pipe, or you could use a 1.25" coupling and 1.25"x(your barrel size) bushing inside which will fit inside 2" pipe quite well.
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Unread postAuthor: warhead052 » Thu Mar 24, 2011 10:52 am

Ok. Well my idea was to make a qev Paintball/dart/aa battery sniper with a old rifle stock, but I was then thinking it could look like a giant internally surpressed sniper. Hence the ideas from Gun Freak for the Coax.
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Unread postAuthor: warhead052 » Thu Mar 24, 2011 11:00 am

Heres something I found on youtube by the way.

http://www.youtube.com/watch?v=Qo0SKiXI ... re=related

(I dont know how to make it appear on the forum, sorry...)
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Unread postAuthor: mark.f » Thu Mar 24, 2011 11:04 am

Have you seen the Bergles Cannon? I think all the talk of Klein Bottles has slightly muddied the concept, which is rather simple.

Are you going to be using metal or PVC? Sorry if I read you wrong, but plastic spacers can still be used in a steel cannon.
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Unread postAuthor: warhead052 » Thu Mar 24, 2011 11:09 am

I will probably use PVC just as a start off, since I have one valveless cannon made, I will try and upload a picture. But I think I will use pvc just to start, but I need to figure out how I could make interchangeable barrels. I might pull up MS Paint and sketch something up, and see what you guys think, but other wise I am gonna try to do what my gut tells me... I am a very good mental designer, and I have made stuff like knife proof vests before out of only chicken wire and a couple old shirts, and I helped a friend build a hairspray potato cannon so I think I can figure out the barrels...
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Unread postAuthor: mark.f » Thu Mar 24, 2011 11:18 am

Alright then. Good luck!
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Unread postAuthor: warhead052 » Thu Mar 24, 2011 11:19 am

Ok. I will get the MS Paint sketch up in about an hour or so...
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Unread postAuthor: Gun Freak » Thu Mar 24, 2011 4:50 pm

Good god, with a 2" chamber your gun will be ugly as crap :lol:
If you're using a rifle stock, you need a smaller chamber so it will look good, otherwise you're wasting the stock. You can use copper and high pressure...
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Unread postAuthor: warhead052 » Thu Mar 24, 2011 7:30 pm

Hey gun freak, I dont think I will use a co ax, because I found I could get a 1/2" sprinkler valve, which I am going to modify instead. I will use a 1/2" barrel with a coupling on the end for ajustable barrel size's and silencers. Sound good?
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Unread postAuthor: Gun Freak » Fri Mar 25, 2011 5:33 pm

Sounds good, but once again, sprinkler valves are rather large to be putting on a gun stock... and where did you find a 1/2" sprinkler valve? Is it metal?
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Unread postAuthor: warhead052 » Fri Mar 25, 2011 7:48 pm

No, its a plastic 1/2" and I think you can even get them down to 1/4". I found them on the Lowes website, just type in rainbird in the search bar, and it pops up a few. In between $10 and $25.
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Unread postAuthor: Gun Freak » Fri Mar 25, 2011 8:07 pm

Ain't no 1/2" sprinkler valves on Lowes.com lol :lol:
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Unread postAuthor: warhead052 » Fri Mar 25, 2011 8:08 pm

There were for me! Or was it home depot? I think it was lowes, but I know I saw them!
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Unread postAuthor: Gun Freak » Fri Mar 25, 2011 8:09 pm

Home Depot definitely doesn't have them :D
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