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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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Unread postAuthor: twizi » Fri May 28, 2010 9:05 pm

Gun Freak wrote: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.


dont do that lets just say the brake line becomes an metal arrow
i would do the suggestion with the end cap drill same size as od of brakeline the fill that with epoxy
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Unread postAuthor: Gun Freak » Fri May 28, 2010 9:06 pm

Lots of people use the masking tape technique.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 9:10 pm

JSR uses foam
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Unread postAuthor: Gaderelguitarist » Fri May 28, 2010 9:24 pm

I've used a drill press to go through a galvanized fitting before, so you should be able to manage.

Don't use masking tape. Just don't do it.
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Unread postAuthor: clemsonguy1125 » Fri May 28, 2010 9:57 pm

Ok I'll try I can always use jsrs foam technique
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Unread postAuthor: jor2daje » Fri May 28, 2010 10:10 pm

i think most drills can, its mainly the bit
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Unread postAuthor: hi » Fri May 28, 2010 10:58 pm

actually i think you can combine brake line and pipe using fittings. Flare the brake line and screw it to the compression fitting. i THINK it wills screw directly to a 1/4'' fitting.
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Unread postAuthor: Lockednloaded » Sat May 29, 2010 12:29 am

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


If anyone did this test, it was done wrong. JB-Weld is extremely strong stuff, I myself have used it up to 400 psi leak free. people have trusted in engine blocks and many guns on this site use it. The key is proper preparation, application, and curing
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Unread postAuthor: theBOOM » Sat May 29, 2010 12:40 am

WAIT don't do any expoying yet, I thought this problem over too and what I came up with is buy a compression fitting for 8 mm pipe, just compress it on to the brakeline and thread of on to anything you want, this way you can also reuse this brakeline as a barrel for any upcoming gun you might want.
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Unread postAuthor: clemsonguy1125 » Sat May 29, 2010 12:19 pm

ok, I see about that, thanks, now I just have to come up with a suitable barrel support, and I need a shocky
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Re: Brakeline Attachment

Unread postAuthor: jimmy101 » Sat May 29, 2010 12:50 pm

clemsonguy1125 wrote:... attach a piece of 1/4 brake line ... 200+ psi

Duck tape can just about do that, the joint really doesn't have to be all that strong. Duck tape will probably leak though, but done correctly it can handle the force on the barrel.

Figure 1/4" brake line is 5/16" diameter(?), at 200 PSI that's about 15 pounds of force trying to push the barrel out'a whatever it is connected into. You can easily apply more force than that with your bare hands.

(OK, I'm not actually advocating the use of duck tape. Just trying to point out that there is actually fairly little force trying to force the barrel out'a the gun.)
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Unread postAuthor: clemsonguy1125 » Sat May 29, 2010 1:20 pm

Ok I need to rephrase that how do I attach and make airtight a piece of brakeline to a reducer
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Unread postAuthor: Gun Freak » Sat May 29, 2010 1:20 pm

Not with duct tape, thats for damn sure.
Use JB Weld, final answer. You can't go wrong with it.
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Unread postAuthor: clemsonguy1125 » Sat May 29, 2010 1:23 pm

Ok That sounds like a plan with the compression fittings, I may make a prototype from PVC sch 80, so in can run test at 150 first and just use epoxy
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Unread postAuthor: jimmy101 » Sat May 29, 2010 1:58 pm

Gun Freak wrote:Not with duct tape, thats for damn sure.
Use JB Weld, final answer. You can't go wrong with it.

There is never a final answer, and you can go wrong with epoxy. Duct tape would work just fine, a bead of hot melt glue on the inside of the fitting to make it air tight ...

Don't rattle off a know-it-all short answer without first looking at the problem. The barrel is subjected to very little force.

The compression fitting is a good way to go. A bit more expensive than is epoxy but it is removable.
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