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pipe straightening

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.
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pipe straightening

Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 10:57 am

my 3/4" pipe i am using for my barrel is a straight as a rounderbout, does anyone have any ways i can make it straighter?
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Unread postAuthor: MrCrowley » Tue Oct 02, 2007 11:05 am

Roll it on the floor till its straight. A hard floor, like concrete or wood, not carpet.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 11:18 am

hmmm does that really work? i would have thought that it would but i might try it unless there is an option that requires less effort.
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Unread postAuthor: williamfeldmann » Tue Oct 02, 2007 11:21 am

If you are dealing with copper that is the easiest way, just don't put a lot of pressure on it or you will have a flat barrel.

If you have another metal, you will need heat and it will be much much harder to do. Although aluminum might straighten out pretty easy.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 11:26 am

... i forgot to mention i'm using pvc
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Unread postAuthor: paaiyan » Tue Oct 02, 2007 12:02 pm

Yea... PVC doesn't really straighten unless you heat it up, but I woldn't trust it afterward.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 12:15 pm

poop so i'm stuck with a bent barrel? and how hot would i need to get it, like hairdryer hot or hotter?
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Unread postAuthor: Hubb » Tue Oct 02, 2007 12:33 pm

Why don't you heat it up so it gets soft, then sleeve some hard copper pipe (straight, of course) into it. That would make it straight and strengthen it at the same time.
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Unread postAuthor: paaiyan » Tue Oct 02, 2007 12:34 pm

hubb017 wrote:Why don't you heat it up so it gets soft, then sleeve some hard copper pipe (straight, of course) into it. That would make it straight and strengthen it at the same time.


At that point, just use the copper.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 12:39 pm

i don't have any copper pipe... so u think that heating then sticking it inanother pipe would work? i would probably not keep it in the pipe because then it wouldn't fit in my breech loading system.
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Unread postAuthor: Hubb » Tue Oct 02, 2007 12:39 pm

It may be easier or harder. If he already has the cannon constructed, he can still use the same fittings by sleeving the pipe and he won't have to solder the copper to an adapter. On the other hand, if the cannon is not constructed, or the barrel is attached by a threaded fitting, it may be easier just to use the copper with an adapter.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 12:42 pm

hmmm interesting , but i can't get 3/4" copper in the uk becasue they don't sell in that size.. i think.
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Unread postAuthor: Hubb » Tue Oct 02, 2007 12:44 pm

Another though would be to heat up your pipe, then use a dowel or metal rod to push down the barrel. Allow it to cool, then remove the rod / stick. It should be straight then.

If you do this, make sure the rod or dowel is lubed well so it comes out the barrel with ease.
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Unread postAuthor: ALIHISGREAT » Tue Oct 02, 2007 1:18 pm

i will have a look for anything suitable in my garage if not i think it will be a trip to b&q at the weekend
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Unread postAuthor: iPaintball » Tue Oct 02, 2007 1:22 pm

No, as long as it's not cellcore, heating it up to bend it wont alter it's pressure rating...much. You could use a heat gun, or go with my ghetto blowtorch-angle iron approach for a heater.
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