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Edit: Australians who need 6mm barrels look inside

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Edit: Australians who need 6mm barrels look inside

Unread postAuthor: lozz08 » Fri Sep 04, 2009 1:06 am

I am going to buy 8mm carbon fiber tube with 1mm wall thickness for a 6mm barrel. Could carbon fiber ever be viable as a barrel? How can I increase the internal diameter by that 0.1-0.4 mm that I want and give it a smooth finish?\


Ok, it turns out that aluminium arrow shafts, size 1714 are perfect for 6mm bb's. They give an internal diameter of 6.035 mm, thats like airsoft tight-bore size. Aluminium is really nice and smooth too. Go to any archery store and ask for single arrows of 1714 size, because most of the time they come in packs of 12 and thats expensive.
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Last edited by lozz08 on Sun Sep 13, 2009 4:12 am, edited 2 times in total.
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Unread postAuthor: Moonbogg » Fri Sep 04, 2009 2:19 am

Not all carbon fiber tube is meant for holding pressure. A lot of it is structural. As far as sanding it goes, it shreds easily and will fray like crazy. If it were me, I would go with ALUMINUM and never EVER look back (unless a mountain of money landed in my lap, then i'd go titanium).
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Unread postAuthor: lozz08 » Fri Sep 04, 2009 3:21 am

well, I'm trying to get some pipe made for me here in aus but it's proving difficult and costly. I wonder how much it would cost, and where the hell you'd get it from, if you wanted to get titanium ones.
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Unread postAuthor: qwerty » Fri Sep 04, 2009 3:27 am

I agree with alluminuim it would be alot cheaper than carbon fibre and easier to cut also the inside oth the tube might be rough and have blowby.
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Unread postAuthor: lozz08 » Fri Sep 04, 2009 5:30 am

So here is no way I could use some kind of very light sanding on the inside to smooth it up and widen it a little? Like wet sanding or 1500 grit?
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Unread postAuthor: Moonbogg » Fri Sep 04, 2009 6:02 am

Do you already have a piece that you are stuck with?
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Unread postAuthor: qwerty » Fri Sep 04, 2009 6:32 am

So here is no way I could use some kind of very light sanding on the inside to smooth it up and widen it a little? Like wet sanding or 1500 grit?


Still that would be realy hard to do how would you manage that?
Maybe you could get a rod and wrap the sand paper around it?
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Unread postAuthor: lozz08 » Fri Sep 04, 2009 6:38 am

Thats what I was thinking. Or perhaps try to use something like grease with grit in it and slide a rode down it to lightly scrape the sides. Kinda hard to do with what I think will be about 45-60 cm long barrel. There must be a smart way to do this, like submerging the entire thing in a pool of solvent that will dissolve it and remove some wall, or something.

It's not that I'm stuck with a piece, it's that I simply cannot find any suitable metal tube ANYWHERE in this crap land we call Australia
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Unread postAuthor: inonickname » Fri Sep 04, 2009 6:54 am

Carbon fiber is too stable to think of doing something like that with.

Try telescopic tubing from model stores or aluminum tubing from hardware stores.
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Unread postAuthor: spudtyrrant » Fri Sep 04, 2009 6:59 am

Moonbogg wrote: (unless a mountain of money landed in my lap, then i'd go titanium).
you don't necessarily need a mountain of money http://cgi.ebay.com/Titanium-tube-tubes ... 6004r17408
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Unread postAuthor: inonickname » Fri Sep 04, 2009 7:39 am

1) That's not rated, it could be seamed.
2) The seller even states it to be a softer temper
3) He admits it's bent
4) It's multiple times more expensive than similar sized aluminum or brass, and that only gets worse as price goes up
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Unread postAuthor: MrCrowley » Fri Sep 04, 2009 7:43 am

lozz08 wrote:Thats what I was thinking. Or perhaps try to use something like grease with grit in it and slide a rode down it to lightly scrape the sides. Kinda hard to do with what I think will be about 45-60 cm long barrel. There must be a smart way to do this, like submerging the entire thing in a pool of solvent that will dissolve it and remove some wall, or something.

It's not that I'm stuck with a piece, it's that I simply cannot find any suitable metal tube ANYWHERE in this crap land we call Australia

I'm in NZ and I found that the metal nozzles from weed-sprayers fit BB's pretty nicely. It has a 6mm inside diameter.
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Unread postAuthor: Brian the brain » Fri Sep 04, 2009 8:19 am

There you go...
Just keep an eye out, you will find something eventually...


And spudtyrrant: I've gotz that Boom-Boom-Pow since about 1984, when my brother and I made our first one... :D
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Unread postAuthor: Technician1002 » Fri Sep 04, 2009 10:09 am

Quick tip, look how to lay carbon fiber and make your own barrel. With a proper form a very smooth inside can be made, or simply lay up a carbon fiber sleeve on a copper or PVC core. It is laid up much like fiberglass. A local plastics and fiberglass outlet near me has the carbon fiber cloth on rolls which is sold by the foot just like fiberglass cloth. It should make a reasonably high pressure barrel that is very light weight.

This video though unrelated to spudding shows how to use the stuff to make an artificial leg.

http://www.youtube.com/watch?v=12jgP_NFDd4

Another video shows the laying of the fiber with the resin for another part.
http://www.youtube.com/watch?v=IAdVO8Rkv6c
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Unread postAuthor: lozz08 » Fri Sep 04, 2009 10:52 am

As resourceful as ever tech.

Im gettin the fiber from

here http://www.hobbysupplies.com.au/Carbon%20Tubes.htm

And if they're trustworthy then it's very good stuff.

Something I've been worried about even when thinking of just smoothing the inside of the carbon tube is how to wrap something around a rod seamlessly and evenly to ensure a perfect round shape.

I was thinking, tech, I could try lapping the inside of the carbon like you showed in my other thread, but as above, don't know how I could do it perfectly, or find a rod of the right diameter to slide down and cause the abrasion.
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