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Coaxial with breech-loading?

Posted: Mon Feb 25, 2008 2:41 pm
by PinHead
I was day-dreaming at work today about a bazooka-style launcher for paintball play, and I started thinking about a coax design just because they look the part so well. I then realized that I had never seen one built that had a true breech-loading system.

Has it been done? Yes, I did a search, but I didn't find much - closest thing I saw was PVC Arsenal's Fish Killer 2. It seems like every other design is either loaded by removing the rear cap and piston/diaphragm, or thru the muzzle.

I had an idea in mind, but I want to know if it's been attempted before.

Posted: Mon Feb 25, 2008 3:02 pm
by Jared Haehnel
I've seen it pretty sweet too.

heres the link...

http://www.advancedspuds.com/pneumatic.htm

Posted: Mon Feb 25, 2008 3:12 pm
by SpudUke5
That design is similar to the bergeles cannon, if i recall correctly, and mega_swordsman is making a bergeles cannon.

I cant seem to find the link to a website that talks about this cannon, but you can give mega_swordsman a pm about this if interested.

Posted: Mon Feb 25, 2008 3:19 pm
by bluerussetboy

Posted: Mon Feb 25, 2008 3:21 pm
by PinHead
That's very nifty, indeed. But it still looks like it takes quite a bit of effort to get it loaded. I wonder if there is a simpler solution?

Has anybody been able to create a design that allows for a magazine or anything else that would allow multiple shots? I had the idea to use a T on the end of the barrel, with the top end exiting out the chamber, and I found another member on here who had the same idea before me (forgive me, I didn't see who it was). The only problem is that the magazine would have to be completely sealed, as it doesn't provide any kind of a cutoff for the rest of the ammo falling in.

Hmm... I just had another crazy idea in the works... :idea: let me see if I can get a concept drawing made. This one's pretty wild.

Posted: Mon Feb 25, 2008 3:27 pm
by bluerussetboy
a ball valve with a hole drilled on the side. maybe epoxy a magazine onto it with a removable endcap.

Posted: Mon Feb 25, 2008 3:27 pm
by ShowNoMercy
You could make a coax with the tee to load it inside the main air chamber and if you make a paddle interrupter you could have a nice semi auto marble gun.

Posted: Mon Feb 25, 2008 9:32 pm
by mega_swordman
LikimysCrotchus5 wrote:That design is similar to the bergeles cannon, if i recall correctly, and mega_swordsman is making a bergeles cannon.

I cant seem to find the link to a website that talks about this cannon, but you can give mega_swordsman a pm about this if interested.
In response to that, it is technically done, however, I had a very large problem gluing the barrel so that it would fit. The way I did it was such that I had to quickly glue three different areas (One to the T and two others to the chamber) such that the barrel didn't extend all the way to the T and now everything is off by about a centimeter. I am also trying to fix mondo leaks due to my "solution" by shortening the street elbows as well as general leaks between fittings. All in all, it will be a while before I work out this problem.

I do have one very good piece of advice for it know. Plan out where and when you are going to glue things together. i spend a while figuring it out and still got it wrong, so be sure to consider everything before gluing.

Posted: Mon Feb 25, 2008 11:54 pm
by keep_it_real
How about this?

I know Hi drew the T inside the coax a long time ago. I just added the loader on top.

Posted: Tue Feb 26, 2008 1:57 am
by Lentamentalisk
has anyone ever thought of just moding a normal coaxial like this?
Image
edit: click on it to see the zoomed view, the resizeing kills it... next time ill use thicker lines.

Posted: Tue Feb 26, 2008 8:27 am
by grumpy
i built mine with a bolt action, very simple and easy to do.
http://www.spudfiles.com/forums/my-pain ... 10804.html

Posted: Tue Feb 26, 2008 9:58 pm
by PinHead
@Lentamentalisk: If I'm looking at that correctly, is it just a T fitting on the end of the barrel, sticking out of the chamber? We've been discussing that one, but the problem is sealing off the T, unless it gets capped airtight between every shot.

@keep_it_real: That looks interesting, but I'm kind of confused by it and need more details. What exactly is that white piece in there, and what does it do?

Part of my wild idea was to make a bolt that actually attached to the piston, so when the piston went back, it could load a round/seal off the T magazine. I'm still working on that one.

Posted: Tue Feb 26, 2008 10:13 pm
by keep_it_real
the white thing is just a bolt. when the bolt is back, ammo drops into the bolt. Push the bolt forward and it drops into the barrel.

Posted: Tue Feb 26, 2008 10:46 pm
by Lentamentalisk
It doesnt have to be sealed airtight, only fairly well sealed. All of the other models require a 1" barrel or less, due to the sprinkler valve restrictions, and a union of sorts with a gigantic ramrod. This way only takes a screw in end cap, or if you want to get all fancy you could use a nice union too.