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New Co-Ax Design

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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New Co-Ax Design

Unread postAuthor: Gun Freak » Wed Jan 27, 2010 4:58 pm

Heres a design i came up with today... what do you guys think? much more simple and cheap than my last piston valve design. i plan to up the measurements to:
Barrel- 3/4"
Chamber- 1 1/2"
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Unread postAuthor: twizi » Wed Jan 27, 2010 5:22 pm

the nail is going to be a problem by leaking
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Unread postAuthor: MrCrowley » Wed Jan 27, 2010 6:00 pm

...unless it is epoxied, but the nail is quite unnecessary. Just make a proper barrel support.
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Unread postAuthor: spudtyrrant » Wed Jan 27, 2010 6:16 pm

MrCrowley wrote: Just make a proper barrel support.

i think its functions more as an ammo stop, even so you could just put it through the barrel instead of the entire assembly
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Unread postAuthor: Gun Freak » Wed Jan 27, 2010 6:41 pm

yes it was originally an ammo stop then a barrel support... but im not using it in the build. i'm too worried about leakage and i dont wanna buy epoxy. i'll just put a little pice of wood under the barrel or something... unless you guys have any suggestions? other than that its pretty good right? :)
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Unread postAuthor: jeepkahn » Wed Jan 27, 2010 6:49 pm

Gun Freak wrote:yes it was originally an ammo stop then a barrel support... but im not using it in the build. i'm too worried about leakage and i dont wanna buy epoxy. i'll just put a little pice of wood under the barrel or something... unless you guys have any suggestions? other than that its pretty good right? :)


Do a search for barrel supports, I believe Hubb has some in his library...

here's one of mine...
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Unread postAuthor: Gun Freak » Wed Jan 27, 2010 7:31 pm

oh thats cool. you just took out the spacing between the spoke things?
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Unread postAuthor: SP00K » Wed Jan 27, 2010 10:52 pm

Could you explain how the piston system works?

Sorry, I haven't ever considered piston systems as an option before. But now that I've seen the simplicity of your design, I'm kind of intrigued in them. A whole new world of options has been set.
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Unread postAuthor: MrCrowley » Wed Jan 27, 2010 11:02 pm

SP00K wrote:Could you explain how the piston system works?

Sorry, I haven't ever considered piston systems as an option before. But now that I've seen the simplicity of your design, I'm kind of intrigued in them. A whole new world of options has been set.

You would've found this if you bothered to check the SpudWiki for Piston Valves or this Pneumatic Cannon Showcase section for How-To's or such, instead you were lazy and hijacked a thread.

Now since I had a go at you for not bothering to search, i'm going to spoonfeed you:
http://www.spudfiles.com/forums/piston- ... t8157.html

You're welcome.
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Unread postAuthor: Marffy » Wed Jan 27, 2010 11:59 pm

it looks great. the only thing i dont like about it (and all coxials) is loading the gun. you either have to take out the back end of the gun or jam the ammo down with a ramrod. Or if you use marbles or nails those usually slide down the barrel. you try using a nail dart of some sort. I'm no coaxial expert but i would upgrade to a bigger pilot or i'd mod the blow-gun.
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Unread postAuthor: MrCrowley » Thu Jan 28, 2010 12:05 am

Marffy may be no coaxial expert but he is certainly right, I would upgrade the blow valve. Even if the piston was sealed with o-rings, a blowgun only decreases performance. Use a ball valve or sprinkler valve and you will definitely get better performance. I would doubt your piston will even actuate with a pilot volume that big and using a blowgun.
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Unread postAuthor: Gun Freak » Thu Jan 28, 2010 6:49 am

ok i'll switch it to a ball valve if i make it. as of now i'm going with my first design... the T piston. 8)
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Unread postAuthor: Marffy » Thu Jan 28, 2010 7:26 pm

MrCrowley wrote:Marffy may be no coaxial expert but he is certainly right, I would upgrade the blow valve. Even if the piston was sealed with o-rings, a blowgun only decreases performance. Use a ball valve or sprinkler valve and you will definitely get better performance. I would doubt your piston will even actuate with a pilot volume that big and using a blowgun.


thanks. i'll take that as a compliment :D
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Unread postAuthor: MrCrowley » Thu Jan 28, 2010 8:14 pm

Marffy wrote:
MrCrowley wrote:Marffy may be no coaxial expert but he is certainly right, I would upgrade the blow valve. Even if the piston was sealed with o-rings, a blowgun only decreases performance. Use a ball valve or sprinkler valve and you will definitely get better performance. I would doubt your piston will even actuate with a pilot volume that big and using a blowgun.


thanks. i'll take that as a compliment :D

You said it yourself, you know yourself better than I know you :P
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Unread postAuthor: Gun Freak » Thu Jan 28, 2010 8:57 pm

is it worth buying a sprinkler valve and a blow gun to mod it, or is the performance of a ball valve even close?
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