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coax help

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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coax help

Unread postAuthor: Crna Legija » Sun Sep 06, 2009 8:07 am

how much epoxy do i need to hold my barrel in my camber. it would be at 150-200psi steal barrel and chamber. 1/2 inch id camber and 8mm od barrel

thanks
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howld this help thats like 2 cm of epoxy
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Unread postAuthor: qwerty » Sun Sep 06, 2009 8:12 am

That would be fine but an easier way that ive used to 300 psi is wrapping the pipe in tap untill it fits in the chamber then smother the tape in epoxy and that way works realy well.
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Unread postAuthor: MrCrowley » Sun Sep 06, 2009 2:27 pm

I think an even better option is finding a brass or galvanised fitting that will fit inside the chamber and will allow the barrel to go through the centre of it. If it doesn't allow a barrel to go through the centre, drill a hole.

Make sure to rough up the fitting and inside of the chamber where you are going to epoxy with sandpaper, before applying the epoxy.

Aside from that, epoxy quanty is down to you. It's not like there's a specific amount you need. Just apply what you think is necessary.
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Unread postAuthor: Crna Legija » Sun Sep 06, 2009 10:44 pm

Thanks for the help

I am going to get a female threaded end cap drill a hole in the middle and solder a barss barrel i got from my dad. Still put some to make sure the air tight because i cant solder good
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is that a good barrel suport it sticks will be glued
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Unread postAuthor: FORE!!!! » Sun Sep 06, 2009 10:52 pm

if you plan on soldering the barrel in the end cap ,you wont need barrel supports :)
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al-xg wrote:
I've used various things like cutting oil, silicone lubricant, even butter

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Unread postAuthor: Technician1002 » Sun Sep 06, 2009 11:17 pm

Use 3 supports instead of 2. With two, it can move sideways.
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Unread postAuthor: FORE!!!! » Sun Sep 06, 2009 11:42 pm

Technician1002 wrote:Use 3 supports instead of 2. With two, it can move sideways.


well that depends on how its manufactured ,i used the same sorta desigh as above and mine didnt move at all.. and you will get better flow with 2 prongs
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Unread postAuthor: Crna Legija » Sun Sep 06, 2009 11:52 pm

Ok thanks Technician1002. should i make the support like a Y shape or T

I just finished my piston on my drill press lathe. Its got to o-ring groves and a check valve. Im not going to post the gun for a at lest a month i got back sugery in to days all part are hear and ready but need solder and flux and a blow torch.

Thanks for all you help.
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Unread postAuthor: MrCrowley » Mon Sep 07, 2009 12:41 am

When my barrel was epoxied in, it lent to one side a bit, so I just used a support on that side to centre it again, but if your barrel is more than about 20cm inside the chamber, i'd use at least 2 barrel supports even if it was centred. If you glue the supports to the barrel and inside of the chamber, it shouldn't move side to side. Though that can be difficult so if you can't glue the supports to the inside of the chamber, do what Tech said and use 3.
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