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 65 users online :: 5 registered, 0 hidden and 60 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Carbon Fiber Barrels

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

Unread postAuthor: POLAND_SPUD » Wed Dec 07, 2011 4:37 pm

see everybody!
yeah I see I see...

so you're saying hi I want to make it as light as possble... and you want to do that ??


get some real steel tubing
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: al-xg » Wed Dec 07, 2011 5:43 pm

You're in the UK, just get some 6mm ID 8mm OD brass tube, it will be lighter stronger, safer and probably also cheaper.
Or if you want you can quite easily also get imperial sizes, I've seen them in hobby shops, as well as DIY shops, and Ebay stocks a variety.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: Goats spudz » Wed Dec 07, 2011 6:02 pm

i tried 6mm id brass but it bent, tore, deformed and worst split
  • 0

Where's my Chuck key?

Goats spudz
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 458
Joined: Tue Aug 02, 2011 12:31 pm
Reputation: 0

Unread postAuthor: Goats spudz » Wed Dec 07, 2011 6:05 pm

  • 0

Where's my Chuck key?

Goats spudz
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 458
Joined: Tue Aug 02, 2011 12:31 pm
Reputation: 0

Unread postAuthor: al-xg » Wed Dec 07, 2011 6:30 pm

You blew up 8mm brass with 600psi ?! Something went wrong there.

Shitty CF will be worse than brass, so you may as well sleeve the brass (pretty handy the way the sizes work) or reinforce it (like suggested for the CF), but I've used brass past those pressures, and many others have too (I mean look at JSR's penguns...) and they should not fail at such low pressures.
Did it have a really thin wall thickness of something ?

read the bold lettering poland


What you're failing to understand, is that not all CF is equal, and carbon fibre is a loose term. The matrix used, the fibre length and orientation, the forming method ...etc all change the way CF composites react.
Different stuff is used for different applications.

It's like comparing high grade aeronautical aluminium trusses, to an aluminium foil tray for a roast chicken. (I'm sure you can get chicken on a foil tray right ? :roll: ) They're both aluminium but you can't interchange their uses.


Edit: I'm confused as to why this is even an issue, I've found 6mm ID aluminium, steel and copper tubes in DIY stores, I can't believe you're struggling so much to find the right tube.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: inonickname » Wed Dec 07, 2011 8:33 pm

Goats spudz wrote:read the bold lettering poland http://news.cnet.com/Here-comes-the-everyday-carbon-fiber-car/2100-1008_3-6114289.html?tag=nefd.top

oops sorry forgot to edit


Look, could you just pay heed to what people are saying?

I don't know what your qualifications are, but it's very clear that you know extremely little about what you're dealing with.

Consider that some people are going to know better. I know some of the people in this thread certainly do.

That carbon fiber tube is crap. It is poorly made with low quality resin and fibers. The method of construction makes it even poorer to act as a pressure vessel.

I don't think you understand what will happen when it fails and the crappy piece of pipe you're going to surround it in doesn't hold. You're going to end up with fine shards of carbon fiber embedded in your upper torso, face and eyes. You'll probably lose your eyesight, and only some of the shards will be removable in surgery. Then every day for several months, you'll be in pain as very fine carbon splinters work their way out of your flesh. You'll be dosed up on antibiotics constantly so one of the hundred wounds you have which will open themselves up every day as the splinters work out don't get infected.

Seen as you're going to skip all over this and link us to some crap about a carbon fiber prototype car, at least read this:

JUST USE A freakin REAL BARREL AND crap THATS NOT GOING TO DAMAGE YOU
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: velocity3x » Wed Dec 07, 2011 9:21 pm

inonickname wrote:JUST USE A freakin REAL BARREL AND crap THATS NOT GOING TO DAMAGE YOU


That's the best advice in this thread!
  • 0

User avatar
velocity3x
Brigadier General
Brigadier General
 
Posts: 827
Joined: Fri Jun 05, 2009 3:09 pm
Location: Yuma, Arizona
Country: United States (us)
Reputation: 7

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Thu Dec 08, 2011 3:49 am

Worth noting:

Many carbon fiber tubes on the market are pultruded. Pultruded tubes are much less expensive and there is a reason for that. The mandrel and the carbon filaments are pulled through a machine and cured at the same time. The downside is that you get very little torsional value from a classic pultruded tube since all of the fibers run in one direction. In real world situations this can be a detriment because with the slightest twist under loading can split the tube. Also pultruded tubes are typically heavier (more resin rich) which degrades the stiffness.


That said, I think it would take a lot of pressure to actually burst one of these. There is one way to find out ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: POLAND_SPUD » Thu Dec 08, 2011 5:17 am

read the bold lettering poland
yeah but your tube is of low quality so you have to sleeve it in metal anyway (and fill the gap with epoxy if you want to)

so as I said earlier in the thread and in the chat >> get a real steel/brass barrel - it will be safer, lighter, stronger and cheaper in the long run as you can reuse the barrel for future projects
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: Goats spudz » Thu Dec 08, 2011 2:37 pm

To stop the rabble could somebody test some CF tube as postal where i live takes the mick! :D
  • 0

Where's my Chuck key?

Goats spudz
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 458
Joined: Tue Aug 02, 2011 12:31 pm
Reputation: 0

Unread postAuthor: mark.f » Thu Dec 08, 2011 2:45 pm

Sorry, I don't want to be pulling these out my ass. :roll:

<div align="center">Image</div>
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3464
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: Goats spudz » Thu Dec 08, 2011 3:06 pm

mark.f wrote:Sorry, I don't want to be pulling these out my ass. :roll:


hide behind plexiglass? :D
  • 0

Where's my Chuck key?

Goats spudz
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 458
Joined: Tue Aug 02, 2011 12:31 pm
Reputation: 0

Unread postAuthor: SpudBlaster15 » Thu Dec 08, 2011 3:41 pm

Goats spudz wrote:To stop the rabble could somebody test some CF tube as postal where i live takes the mick! :D


I'm sorry to be blunt, but what is wrong with you? The dangers of using low grade CF as a barrel material have been effectively demonstrated by numerous posts in this thread, yet you shrug this off as 'rabble' and continue to insist on using a material that is not suitable for the application. Since you have apparently failed to absorb anything from what's been discussed thus far, let me make it perfectly clear: Longitudinally oriented unidirectional carbon fiber is not suitable for use as a pressure vessel! End of story.

Please just pay whatever exorbitant postage fee is required, and get a proper, non-fragmenting barrel shipped to you.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: al-xg » Thu Dec 08, 2011 4:29 pm

It's not even hard to get decent tubing in the UK. Not sure what this is about.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: Crna Legija » Fri Dec 09, 2011 5:42 am

SpudBlaster15 wrote: Longitudinally oriented unidirectional carbon fiber is not suitable for use as a pressure vessel!


i doubt he knows what that means :lol:
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

PreviousNext

Return to Construction Materials/Ammo Discussion

Who is online

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

Reputation System ©'