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What to do with all this copper???

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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What to do with all this copper???

Unread postAuthor: jeepkahn » Tue May 05, 2009 3:22 pm

A friend of mine who works at a welders supply shop just gave me a 10ft stick of 1.5" type L, a 10ft stick of 1.25" type L, AND a 10ft stick of 1" type K....

I'm thinking, use some of the 1.5" to make a hipres chamber for my mini modgun (36" .40 cal blowgun barrel with a .5"od compression to 3/4" npt fitting attached to a 3/4"qev with 18" of 1.5"type L copper chamber[it's currently 18" of 1.25sch40 as the chamber])...

And how about the 1" type K as barrel for a steel gun pushing 500+ psi???(time to stock up on 1" bearings)....

I know some of you copper junkies have got some idea's....
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Unread postAuthor: ALIHISGREAT » Tue May 05, 2009 3:29 pm

-plumb a house
-make a spud gun
-sculpture?

the posibilities are almost endless! :D
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Unread postAuthor: rp181 » Tue May 05, 2009 4:51 pm

melt it all down, and sell it. then make a bunch of PVC guns =)
But really, nice job on getting the large diameter copper pipe. I say pure copper rifle style, with a 1/2" copper bore.
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Unread postAuthor: jrrdw » Tue May 05, 2009 4:54 pm

Build your ol buddy jrrdw a 300psi marble shooter. :wink:
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Unread postAuthor: jeepkahn » Tue May 05, 2009 5:36 pm

jrrdw wrote:Build your ol buddy jrrdw a 300psi marble shooter. :wink:


I was thinking more along the lines of 500+...
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Unread postAuthor: Gippeto » Tue May 05, 2009 6:56 pm

1" type K drawn copper has a rated working pressure of 1126psi, and a burst pressure of 7200psi.

1 1/4" type L drawn copper has a rated working pressure of 755psi with a burst pressure of 4550psi.

1 1/5" type L drawn copper has a rated working pressure of 702psi with a burst pressure of 4100psi.

Lots of (safe) wiggle room.

Use of 95/5 tin/antimony solder is recommended. :)

Un-regged CO2 with a 1" or 1 1/4" bore??? :twisted:
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Unread postAuthor: jook13 » Tue May 05, 2009 6:59 pm

There are not many hybrids made out of copper... :idea:
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Unread postAuthor: jeepkahn » Tue May 05, 2009 7:09 pm

Gippeto wrote:1" type K drawn copper has a rated working pressure of 1126psi, and a burst pressure of 7200psi.

1 1/4" type L drawn copper has a rated working pressure of 755psi with a burst pressure of 4550psi.

1 1/5" type L drawn copper has a rated working pressure of 702psi with a burst pressure of 4100psi.

Lots of (safe) wiggle room.

Use of 95/5 tin/antimony solder is recommended. :)

Un-regged Co2 with a 1" or 1 1/4" bore??? :twisted:


:D :twisted: :twisted: :D

Oh YEAH!!! How many psi can you compress helium to??? Mach What??? Cinderblock walls won't be a sufficient backstop??? Muzzle energy rated in tons???
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Unread postAuthor: Gippeto » Tue May 05, 2009 7:15 pm

With CO2... Mach nothing. :(

But serious punch as the projectiles will be on the heavy side, and WILL be moving, shall we say... "briskly".:D

My marble gun gets 750fps with 400psi CO2 and 14mm glass marbles.

830fps with 400psi air. :twisted:

Convenience costs fps I suppose. :wink:
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Unread postAuthor: jook13 » Tue May 05, 2009 7:17 pm

Convenience costs fps I suppose.


Depends... Nitrogen is pretty convenient once you have a container and a place to fill it.
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Unread postAuthor: Technician1002 » Tue May 05, 2009 7:20 pm

Gippeto wrote:1" type K drawn copper has a rated working pressure of 1126psi, and a burst pressure of 7200psi.

1 1/4" type L drawn copper has a rated working pressure of 755psi with a burst pressure of 4550psi.

1 1/5" type L drawn copper has a rated working pressure of 702psi with a burst pressure of 4100psi.

Lots of (safe) wiggle room.

Use of 95/5 tin/antimony solder is recommended. :)

Un-regged CO2 with a 1" or 1 1/4" bore??? :twisted:


For high pressure stuff, silver brazing solder is recommended.


http://www.phred.org/~josh/build/brazing.html
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Unread postAuthor: Gippeto » Tue May 05, 2009 7:22 pm

True enough Jook. :)

Still, the bottles for CO2 are smaller and lighter for transport, and using liquified gas does provide more shots per bottle.

Only a problem if you leave the yard I suppose. :wink:


Edit:@ Tech; Brazing copper aneals the tube, LOWERING the maximum safe pressure.
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Last edited by Gippeto on Wed May 06, 2009 1:28 pm, edited 1 time in total.
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Unread postAuthor: jeepkahn » Tue May 05, 2009 8:19 pm

I'm thinking about the 60lb bottle of helium my neighbor just had filled...
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Unread postAuthor: Gippeto » Tue May 05, 2009 8:36 pm

jeepkahn wrote:I'm thinking about the 60lb bottle of helium my neighbor just had filled...


Mu..Ha..Ha..Ha... :twisted: :twisted:
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Unread postAuthor: jmccalip » Tue May 05, 2009 9:40 pm

A stand for a PVC gun.
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