Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 75 users online :: 4 registered, 0 hidden and 71 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Brakeline

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.
Sponsored 
  • Author
    Message

Brakeline

Unread postAuthor: sputnick » Tue Jan 13, 2009 10:38 pm

Hey everybody,

This question addresses everybody, but I especially want the feedback of people who make BBMG's and other bb guns.

I have 1/4 inch brake line, and want to use it as the barrel in a pellet/ piston gun, but find that the factory fitting on the end would not reach back far enough into a T to be effective for a piston, it would hover in the middle of the T, but I want to extend into a nipple behind it.

So I was wondering how YOU would attach 1/4 inch brake line to a 1/2 inch galvanized (threaded) T.

Any sort of epoxy is out, even if I had it, I would not trust it with high pressures, I was thinking more along the lines of a drilled out end cap or threaded plug, and how I could secure it into that.

Hole drilled through this...
Image

so brakeline will go through this...
Image
  • 0

Image


Add me on MSN to chat about whatever!
User avatar
sputnick
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Sun Dec 14, 2008 3:53 pm
Location: Ontario Canada
Reputation: 0

Unread postAuthor: Cosmic Muffin » Tue Jan 13, 2009 10:56 pm

you should drill a hole so the brake line fits very snugly inside.
and yes, you should use metal epoxy, its fine under pressure.
thats the only way you could do it without welding.
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: sputnick » Tue Jan 13, 2009 11:09 pm

What about like JB weld or something, would that work? because I do not have much money with which to buy special adhesives.
  • 0

Image


Add me on MSN to chat about whatever!
User avatar
sputnick
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Sun Dec 14, 2008 3:53 pm
Location: Ontario Canada
Reputation: 0

Unread postAuthor: MrCrowley » Tue Jan 13, 2009 11:13 pm

sputnick wrote:What about like JB weld or something, would that work? because I do not have much money with which to buy special adhesives.

That's fine. I'd recommend to leave it to dry for a week before using. I've got best results waiting a week. It says 24hours, but I reckon it's prone to stress fractures a lot more if you only leave it for 24hours.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: kablooie » Tue Jan 13, 2009 11:24 pm

How about a compression fitting? What I did on my bb gun is I drilled out the stop on a 1/4" compression fitting and slid the brakeline through that into the tee, from the inside so the factory made lip on the end could be used as the sealing area. I found a 1/4" compression fitting with 1/2" npt threads, you could always use an adaptor.
  • 0

User avatar
kablooie
Sergeant Major
Sergeant Major
 
Posts: 188
Joined: Sun Feb 18, 2007 8:21 pm
Reputation: 0

Unread postAuthor: daccel » Wed Jan 14, 2009 2:59 am

Depending on the pressure, epoxy is probably safe.

But you could also find a pipe/tube slightly larger than the brakeline and have a short section of this on the inside of the t with a hole drilled slightly smaller than it, so that the force of the piston is being applied to the steel fittings. And then sleeve the brakeline inside this or position it just outside depending on the sizes.
  • 0

User avatar
daccel
Donating Member
Donating Member
 
Posts: 238
Joined: Thu Oct 11, 2007 9:51 pm
Location: BC, Canada
Reputation: 0

Unread postAuthor: suburban spudgunner » Thu Jan 15, 2009 4:40 am

You should be able to use JB weld on it: I used it several times both to construct and repair leaks in my pneumatic. It should hold up, unless you intend to use some really high pressure. The highest I can personally recommend it for is about 300 psi: that's the highest pressure I've used it at.
  • 0

The definition of insanity is doing the same thing over and over again and expecting different results.
User avatar
suburban spudgunner
Staff Sergeant
Staff Sergeant
 
Posts: 124
Joined: Mon Jan 05, 2009 4:08 pm
Location: Oak Lawn, Illinois, USA
Reputation: 0

Sponsored

Sponsor
 


Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'