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i need help finishing my coaxal

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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i need help finishing my coaxal

Unread postAuthor: turner » Mon Sep 07, 2009 10:40 pm

how would i put a 5/16 aluminum barrel sleeved in 9/32 inside the chamber. i tried drillling a hole in an end cap its to hard to make small enough barrel supports to fit inside.
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Unread postAuthor: MrCrowley » Mon Sep 07, 2009 10:51 pm

If you glue the barrel support to the barrel and chamber, you will only need one support. So find a piece of plastic that will fit inside the chamber between the chamber and barrel and will make the barrel centered. Once you've done that, just glue the barrel to the support and then the support to the chamber.
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Unread postAuthor: noname » Tue Sep 08, 2009 10:15 pm

For attaching the barrel and having it centered, just use a 3/4" x 1/4" reducer on the front of the gun. Screw in a 1/4" nipple. 5/16" brakeline fits pretty well in 1/4" nipples, so with lots of epoxy it should work fine.
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Unread postAuthor: turner » Tue Sep 08, 2009 11:03 pm

i like noname"s idea but could i use like a 9/32nd compression fitting or something? i would like to e able to service it maby
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Unread postAuthor: noname » Wed Sep 09, 2009 12:01 am

You won't find a 9/32" compression fitting at a local hardware store; I can pretty much promise that. However, 5/16" ones are fairly available. The downside to those is (maybe just the brand Ace uses, I don't know) is that the little olive can slip sideways a little bit and bend the brakeline. It's happened to me before and it will make sealing quite difficult.
Another thing on sealing, if you just have a 9/32" brakeline barrel, it will cut a hole straight through your sealing face with no problem at all.
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Unread postAuthor: Technician1002 » Wed Sep 09, 2009 1:32 am

noname wrote:You won't find a 9/32" compression fitting at a local hardware store; I can pretty much promise that. However, 5/16" ones are fairly available. The downside to those is (maybe just the brand Ace uses, I don't know) is that the little olive can slip sideways a little bit and bend the brakeline. It's happened to me before and it will make sealing quite difficult.
Another thing on sealing, if you just have a 9/32" brakeline barrel, it will cut a hole straight through your sealing face with no problem at all.


Remember the size is not the size of the hole. The size is the nominal pipe size.
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Unread postAuthor: turner » Thu Sep 10, 2009 11:09 pm

i was going to put the sealing face on the breech of the barrel. for the barrel i got a 5/16 aluminum tube sleaved in 9/32 for the hobby shop. ace had a lot of stuff in 3/8 could i just wrap some tape on the section of the barrel? i kinda dont wana use epoxy because the walls are so thin to roughen up
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Unread postAuthor: turner » Sat Sep 12, 2009 6:44 pm

todaw i went to lows and there selection sucks so i got a 1/2 to 1/4 reducer and jb welded the barrel see if it worked tomorrow
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