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Worth it?

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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Worth it?

Unread postAuthor: schismatized » Sat Jun 23, 2007 7:12 pm

Would it be worth it to build a large coaxial, say, 10'x2" barrel and 9'x4" chamber? I was looking at fittings and it wouldnt be too expensive, but then i got to thinking, im gonna need a LONG ramrod. is there anyway i could make some sort of quick disconnect behind the piston to load spuds at the valve end? threads take an awful long time to screw on and off after each firing.
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Unread postAuthor: noname » Sat Jun 23, 2007 7:17 pm

You could hook up the plug to a drill, so you could spin it out, or you could use some HUGE cam locks.
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Unread postAuthor: Velocity » Sat Jun 23, 2007 7:20 pm

Well, heres what you do. Buy a regular 2" SCH 40 tee, and buy a 4" tee with the perpendicular leg only 2". Instead of putting a female adapter and then a plug at the end of the coaxial, put the 4" x 2" x 4" tee, then the female adapter, and then the plug. On the barrel portion, put the 2" tee at the end of the barrel. Sand out the stops in 2" leg of the 4" tee, and then pass a piece of 2" pipe through the hole. It'll be tricky, but solvent weld the 2" pipe in both the 2" tee socket and the 4" perpendicular leg (which is 2" as well) socket. Slap a female adapter and plug onto the end of this 2" pipe, and there you go.
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Unread postAuthor: schismatized » Sat Jun 23, 2007 7:38 pm

good idea rmich, but idk if i would be able to shoot spuds with it lol. wonder how much large cam locks cost...
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Unread postAuthor: Gepard » Sat Jun 23, 2007 7:42 pm

They're not that hard to make if you have the right tools.....

Michael
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Unread postAuthor: schismatized » Sat Jun 23, 2007 8:11 pm

yeah i dont have a lathe or mill... but i got most of the basic woodworking tools.. numerous hand drills, drill press, different types of saws, etc.. What did you have in mind gepard lol?
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Unread postAuthor: Gepard » Sat Jun 23, 2007 8:23 pm

Hang on, we're talking about barrels where you undone the clips and put another on without screwing it right?

Michael
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Unread postAuthor: VH_man » Sat Jun 23, 2007 8:33 pm

yes, we are.........
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Unread postAuthor: Gepard » Sat Jun 23, 2007 8:38 pm

Get a male to slip and a female to slip and take off the threads.

Bend some sheet metal into like a U shape and then pivot one end.

Bend some steel rod into a U shape but so it goes in at the top: (ignore the as I used them as spaces)

----aaaa ------
|aaaaaaaaaaa|
|aaaaaaaaaaa|
|aaaaaaaaaaa|
|aaaaaaaaaaa|
|aaaaaaaaaaa|
|__________|

And make it so the gap goes through the middle of the U sheet steel.

Attach the pivot at the end to the female-slip piece and then on the male make it so there are two bits pointing out that you can hook the loops around.

One one each side and you should be good to go without needing a lathe or mill :D

That make sense?

Michael
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Unread postAuthor: schismatized » Sun Jun 24, 2007 2:38 pm

umm i see kind of. haha seems like a lot of work. i don't have access to a lot of metal supplies during the summer tho.. I was thinking about hooking up a drill to the male end.. or maybe fashioning a large wrench that fits around it. hmm any ideas on how i would go by fashioning a drill to it? I made a rough sketch of the gun, without any mods for quick loading:
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Attachments
coaxcannon.gif
I'm wondering if i should use two 90s to move the sprinkler valve and fill area on top of the gun...
coaxcannon.gif (3.16 KiB) Viewed 505 times
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Unread postAuthor: schismatized » Mon Jun 25, 2007 1:10 pm

also, how would i go about centering the barrel in a 10' long chamber?
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Unread postAuthor: schismatized » Mon Jun 25, 2007 5:00 pm

bump bump bump bump
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Unread postAuthor: Flying_Salt » Mon Jun 25, 2007 5:16 pm

Psst we don't like bumping threads here, it isn't runescape :wink:

You could make a ghetto breech and use a bendy hose as a ramrod?
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sgort87 wrote:I hereby present Flying_Salt with The one and only <a href="http://www.geocities.com/sgort87/ghetto">Ghetto Award!</a>
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Unread postAuthor: schismatized » Mon Jun 25, 2007 5:49 pm

i realized that, idk if anybody likes bumps. im just bored. sorry mom. :(
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Unread postAuthor: singularity » Mon Jun 25, 2007 5:54 pm

about the barrel centering, i ran into the same problem with a big 3" camber 1" barrel 5 foot long coaxil i built a while back i used this thing...

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2261.jpg">
<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2263.jpg">

basically its a 1 inch coupler i bored out so it could slide it over the barrel, then i ca glues some flattened PVC sheets to it, and cut them down to size using a dremel. the PVC was flattened by cutting a piece of pipe in half, then sticking it in boiling water, then quickly pulling it from the water and flattening it between two pieces of wood. it takes a few trys to get right but its not that much work once you have the water boiling
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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