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Smoothbore Barrel?

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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Smoothbore Barrel?

Unread postAuthor: BeaverRat » Sat Nov 06, 2010 11:39 pm

Hello, I have recently completed my 3/4 inch high pressure cannon, but I need a nice barrel for it. Seamless steel and aluminum is too expensive. Copper would be nice, but my question is: can I use a 3/4th inch copper barrel and somehow adapt it to 3/4th inch male pipe threads without soldering? I have no clue how to solder, and I have no tools for it.

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Unread postAuthor: kjjohn » Sat Nov 06, 2010 11:42 pm

Soldering is fairly easy to learn, and only requires a propane torch. It should only cost you about $10 to get started.
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Unread postAuthor: MrCrowley » Sat Nov 06, 2010 11:53 pm

Just use a compression fitting:
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Unread postAuthor: Lockednloaded » Sat Nov 06, 2010 11:53 pm

compression fittings.

EDIT:
Damn you Mr.C
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Unread postAuthor: BeaverRat » Sun Nov 07, 2010 12:35 am

Ye, I figured that compression fittings would be the recommendation. I am using them on my fridge compressor, but that is for small diameter copper tubing. I didn't know they exist for larger (3/4") pipe. Also, are they strong enough to withstand several hundred PSI?
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Unread postAuthor: MrCrowley » Sun Nov 07, 2010 12:39 am

Yes, you can get them in 3/4" and I believe members have taken them to around 300PSI. Wont matter so much on a barrel.
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Unread postAuthor: BeaverRat » Sun Nov 07, 2010 12:56 am

Thankyou, that will be all...
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Unread postAuthor: DYI » Sun Nov 07, 2010 3:53 pm

Compression fittings that size do exist, although they're not available at any hardware store I've been to. Sweating is cheap and useful, and the fittings are much more readily available. Unless you're building a steam gun or similar, I recommend spending the ~$25 and using regular fittings.
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Unread postAuthor: metalmeltr » Sun Nov 07, 2010 4:22 pm

DYI wrote:Compression fittings that size do exist, although they're not available at any hardware store I've been to. Sweating is cheap and useful, and the fittings are much more readily available. Unless you're building a steam gun or similar, I recommend spending the ~$25 and using regular fittings.
I belive home depot carries 3/4" compresion fittings. I will check and report back.

Edit: checked Home Depot's website, no 3/4" compression fittings, however i think i saw some there today.
If you dont want to solder try these, http://www.homedepot.com/Plumbing-Pipes ... _SharkBite
sharkbite push to connect fittings
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Unread postAuthor: auxiliary » Sun Nov 07, 2010 8:39 pm

The problem with sharkbite fittings is that although they seal air, they do not firmly secure the pipe. Using this type of fitting for your barrel will make it wobble around like crazy.
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Unread postAuthor: DYI » Sun Nov 07, 2010 9:07 pm

I belive home depot carries 3/4" compresion fittings. I will check and report back.


Using flexible tubing for your barrel is, to put it bluntly, a terribly stupid idea in all regards. Why would you even consider doing that?
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Unread postAuthor: BeaverRat » Sun Nov 07, 2010 9:08 pm

Well, I decided to just get the soldering equipment. I watched several videos on the subject, and it doesn't look too bad.
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Unread postAuthor: Lockednloaded » Sun Nov 07, 2010 9:57 pm

Has anyone ever actually used a sharkbite fitting for a spudding application?
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 07, 2010 10:52 pm

Why has no one mentioned the epoxy option :P

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Good enough for a 12x 3/4" hybrid ;)
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