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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!
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Unread postAuthor: POLAND_SPUD » Tue Dec 06, 2011 8:37 pm

Where you gonna find seamless 6mm ID steel tube?

From here: http://www.castorama.pl/ (it's kind of like homedepot)
They've got a bunch of small ID (from 3mm to 15mmID) tubing

also you can use google to find stuff on the internet, you know? :-D

http://www.metal-supplies.com/8601/12753.html

or you can check ebay
http://www.ebay.com/itm/Knife-Making-ST ... 45fe1e44f0
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Unread postAuthor: Gun Freak » Tue Dec 06, 2011 8:44 pm

That's 6.35mm ID :wink:
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Unread postAuthor: POLAND_SPUD » Tue Dec 06, 2011 8:48 pm

acctually that's 0.230"....
.250" - 0.10 wall = .230"

anyway I found tube right there that's alsmot exactly 6mm (1/4" OD but different wall thickness)

don't blame me for your retarded english units - blame your ancestors
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Unread postAuthor: Gun Freak » Tue Dec 06, 2011 8:57 pm

Oops, .230 ID... 6mm I think is .23622... BBs are about 5.95mm which is .234, so that tube is too small...
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Unread postAuthor: POLAND_SPUD » Tue Dec 06, 2011 9:10 pm

yeah I know that
anyway -> http://www.ebay.com/itm/STAINLESS-TUBE- ... 484205e40d

that's almost exactly 0.22"



there are tons more of them but I don't have the patience to convert your RETARDED units (9/32 ? like WTF is that ?) at 3AM.
I mean WTF?!? it's 21st century for god's sake. Even Malaysia switched to metric
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Unread postAuthor: Gun Freak » Tue Dec 06, 2011 9:34 pm

Imperial FTW!!!

Standard 1/4" K & S brass from hardware stores has an ID of .222". Just sayin.
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Unread postAuthor: inonickname » Tue Dec 06, 2011 10:10 pm

Noone seems to get what this barrel will do to you when it fails.

Carbon fiber splinters are EXTREMELY painful. I had two small ones, about a millimeter wide and a few millimeters deep, and I had to remove them with small pliers. They REALLY hurt.

When you get the shards and splinters too deep they are extremely hard to remove surgically, and chances are you'll have to wait for months for all of the splinters to work themselves out of your flesh, while dealing with constant risk of infection.

Image
Image

It makes no difference that you've got a nylon tube around it, do you think 600 psi of pressure will care?

Just buy steel or aluminium. Cheap carbon is crap anyway and has crappy finishes and tolerances. Well made carbon is more expensive than what you're willing to sink into the whole gun.
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Unread postAuthor: Zeus » Tue Dec 06, 2011 10:54 pm

Ino, I made that point in the chat, I've had a couple, and a lot of fibreglass splinters, and I don't like the stuff. I don't use carbon arrows anymore either.
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Unread postAuthor: Goats spudz » Wed Dec 07, 2011 2:36 am

Poland i live in the UK and shipping from america is like £40
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Unread postAuthor: inonickname » Wed Dec 07, 2011 7:53 am

Zeus wrote:Ino, I made that point in the chat, I've had a couple, and a lot of fibreglass splinters, and I don't like the stuff. I don't use carbon arrows anymore either.


I still use carbon arrows :wink: they're fine as long as they're checked regularly for damage. If you want an ultra micro shaft carbon or A/C is really your only choice
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Unread postAuthor: Goats spudz » Wed Dec 07, 2011 10:15 am

im just gonna sleeve the tube in something liqht, if it fails i will try ss
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Unread postAuthor: Gippeto » Wed Dec 07, 2011 10:33 am

Goats spudz wrote:im just gonna sleeve the tube in something liqht, if it fails i will try ss


I hope your stubbornness doesn't bite you in the ass. If it does...post pictures so we can all point and laugh okay? :wink:
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Unread postAuthor: Goats spudz » Wed Dec 07, 2011 10:43 am

Gippeto wrote:
Goats spudz wrote:im just gonna sleeve the tube in something liqht, if it fails i will try ss


I hope your stubbornness doesn't bite you in the ass. If it does...post pictures so we can all point and laugh okay? :wink:
Sure thing :D
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Unread postAuthor: al-xg » Wed Dec 07, 2011 12:48 pm

Great for Kite projects and orther lightweight RC projects.


It seems most likely the fibres are orientated in the longitudinal axis according to the application.

This is not good for hoop stress and therefore holding pressure.

If you want carbon fibre tubing that will hold pressure, you'll need a wound tube, or rolled carbon fibre cloth.

Wound tube being made:
[youtube]http://www.youtube.com/watch?v=La-4v8wfEIg&feature=related[/youtube]
Carbon fibre reinforced aluminium for paintball/diving tanks/...etc:
[youtube]http://www.youtube.com/watch?v=3opzktClUn8&feature=related
[/youtube]
Here is a rolled cloth tube being made (not carbon, but still a fibre composite, possibly glass fibre):
[youtube]http://www.youtube.com/watch?v=ODz8s24QauA&feature=related[/youtube]

Rolled cloth carbon tube:
Image


See how those a different to the tubes made from longitudinal fibres ?
Look they are lengthways, and don't wrap around:
Image

You can see them splintering out.

A bit of these tubes looks like this:
Image
The carbon fibres are very strong when pulled along their length, but if you pull from the sides, it is only the matrix holding the fibres together, and it is no where near as strong.

So consider this wisely.
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Unread postAuthor: Goats spudz » Wed Dec 07, 2011 3:47 pm

jackssmirkingrevenge wrote:I still think the CF pipe is a good option. If you're worried about strength, centre it in some larger ID pipe and fill the gap with epoxy ;) for extra peace of mind, wrap it in wire before pouring...
see everybody! :shock:
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