SpudFiles

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

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.

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

read the bold lettering poland http://news.cnet.com/Here-comes-the-eve ... g=nefd.top

oops sorry forgot to edit

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 ? ) 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.

Goats spudz wrote:read the bold lettering poland http://news.cnet.com/Here-comes-the-eve ... g=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 shit. 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 shit about a carbon fiber prototype car, at least read this:

JUST USE A FUCKING REAL BARREL AND SHIT THATS NOT GOING TO DAMAGE YOU

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

That's the best advice in this thread!

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

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

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

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

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

hide behind plexiglass?

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

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

i doubt he knows what that means