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Brakeline Attachment

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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Brakeline Attachment

Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 6:29 pm

For a upcoming BB Rifle I want to attach a piece of 1/4 brake line to a galvinised steel reducer, but the adapter that comes with it doesnt fit. It slides into a 1/8 reducer, Will epoxy hold pressures of 200+ psi. Its Devcon Epoxy rated to 1500 psi but it doesnt bond to steel well. I do not have access to a welder or propane blow torch.
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Unread postAuthor: Gaderelguitarist » Fri May 28, 2010 7:05 pm

Do you have access to JB Weld? As far as I know, it bonds to steel quite well.

Its weird that your epoxy isn't bonding to the steel though. Most epoxies are multi-surface adhesives.
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Unread postAuthor: irisher » Fri May 28, 2010 7:06 pm

It is very important to rough up both faces when epoxying. That should help it bond to steel.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 7:15 pm

Ok thanks, I heard JB Weld leaks at 200 psi, I roughed up the brakeline a little on a old mini but it still leaked at 100 psi and began to come loose.
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Unread postAuthor: irisher » Fri May 28, 2010 7:18 pm

It all depends on the situation really.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 7:19 pm

Its the cheap 3 buck epoxy that comes in a double syringe, maybe some better quality stuff will work
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Unread postAuthor: Gun Freak » Fri May 28, 2010 7:52 pm

Just JB the hell out of it, it won't leak.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 7:57 pm

I think it was Mr C who tested JB Weld to 200 psi and it always leaked but maybe it was someone else, I may try it anyway though
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Unread postAuthor: irisher » Fri May 28, 2010 8:05 pm

On a properly prepared surface, the liberal application of Jb-weld produces some very strong joints.
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Unread postAuthor: jor2daje » Fri May 28, 2010 8:48 pm

Aslong as the fits are tight and you prepare the surfaces properly either epoxy or jbweld should easily hold those pressures.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 8:52 pm

Well i doesnt fit tight so I will add tape I guess then pour in the epoxy
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Unread postAuthor: Gun Freak » Fri May 28, 2010 8:54 pm

Wrap it tightly with masking tape then shove it in, then cover the front of it with JB and you should be fine. You could even pour eopxy all over the top of that to be safe.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 9:01 pm

Ok Ill try that
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Unread postAuthor: jor2daje » Fri May 28, 2010 9:02 pm

i wouldnt use tape, I would get a plug that fits the reducer then drill a exact hole into that, then epoxy or jbweld the brakeline into that.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 9:03 pm

Im not sure if my drill can go through galvinised steel, Ill clamp it down and see
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