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Copper berry gun + pictures

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Copper berry gun + pictures

Unread postAuthor: tridactyla » Sat Sep 22, 2007 3:47 pm

Hello,

First off, this is a copy of plasticex009's HVPL-01. I thought his design was a great idea so I made my own. I finished this about a month ago but haven't gotten around to posting it.

I call it the berry gun because my primary ammo is these berries that grow near my house. But don't be deceived by a berry as a projectile. They are able to do quite a bit of damage. The chamber is made of two 24" pieces of 1" copper, and the barrel is 56" of 1/2" copper. It is piloted by a 1/2" ball valve.

Let the pictures and videos begin (they are pretty big).

If you can't play the videos, try VLC media player. They are xvid video with mp3 audio.

The gun itself:

Whole gun:
Image
Valve area:
http://www.obberon.com/pictures/copper/whole_gun/cimg0287.jpg
Piston valve:
http://www.obberon.com/pictures/copper/whole_gun/cimg0288.jpg
Shinyness:
http://www.obberon.com/pictures/copper/whole_gun/cimg0289.jpg
My cat:
http://www.obberon.com/pictures/copper/whole_gun/cimg0285.jpg

Berry against a soup can:

Video:
http://www.obberon.com/movies/copper/berry_vs_can.avi
First attempt at 85 psi:
http://www.obberon.com/pictures/copper/berry_vs_soup_can/cimg0294.jpg
Second attempt at 120 psi:
http://www.obberon.com/pictures/copper/berry_vs_soup_can/cimg0296.jpg
Side by side:
http://www.obberon.com/pictures/copper/berry_vs_soup_can/cimg0298.jpg

Nail through quarter:

Side by side:
http://www.obberon.com/pictures/copper/nail_through_quarter/cimg0347.jpg
Quarter:
http://www.obberon.com/pictures/copper/nail_through_quarter/cimg0349.jpg
Side view:
http://www.obberon.com/pictures/copper/nail_through_quarter/cimg0350.jpg
Nail:
http://www.obberon.com/pictures/copper/nail_through_quarter/cimg0351.jpg

Berry against soda cans:

Video:
http://www.obberon.com/movies/copper/berry_soda_cans.avi
Pictures:
http://www.obberon.com/pictures/copper/berry_soda_cans

Berry against altoids sour tin:

Video:
http://www.obberon.com/movies/copper/altoids_tin.avi

Please post any questions or comments.
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Unread postAuthor: LikimysCrotchus5 » Sat Sep 22, 2007 3:50 pm

Nice cannon! does this cannon use a piston valve?
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Unread postAuthor: tridactyla » Sat Sep 22, 2007 3:54 pm

Thanks for the feedback!

Yes it does use a piston valve. The piston is just a bolt with two washers with a short piece of 1/2" pvc and an o-ring in the middle.
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Unread postAuthor: Redcoat » Sat Sep 22, 2007 3:56 pm

Awesome. Yes it uses a piston valve. Piloted by a Ball valve. more info on pistons here

Nice gun. I didn't realise a berry could do so much damage. I just thought it would splatter.

Happy SPuddin'
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 23, 2007 12:02 am

Nicely done :) though berries are limiting its destructive potential
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Unread postAuthor: LikimysCrotchus5 » Sun Sep 23, 2007 12:15 am

Also what do you use to glue together copper pipes. and i am interested in making one of these copper guns but i just wna to know a little more on how to make that piston valve of yours. Maybe a diagram and a step-by-step instruction. That would be greatly appreciated. Thx. And pictures of the piston too.
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Unread postAuthor: Pete Zaria » Sun Sep 23, 2007 12:32 am

LikimysCrotchus5 wrote:Also what do you use to glue together copper pipes. and i am interested in making one of these copper guns but i just wna to know a little more on how to make that piston valve of yours. Maybe a diagram and a step-by-step instruction. That would be greatly appreciated. Thx. And pictures of the piston too.


Copper is soldered (sometimes called sweated) or brazed using a propane/MAPP torch and solder, not glued. They *could* be connected by epoxy or etc... but that won't hold anywhere near as much pressure. Properly soldered copper joints should hold 250+psi.

@tridactyla,
Very nice gun. Not your first, I assume?
Hope you stick around the forums.



Peace,
Pete Zaria.
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Unread postAuthor: tridactyla » Sun Sep 23, 2007 12:35 am

Thanks jackssmirkingrevenge!

But berries aren't my only ammo. I can also shoot AAA batteries and whatever else I find that fits in the barrel. I just haven't made any videos or taken any pictures.

LikimysCrotchus5,

The copper is not glued to to the fittings but soldered. Search around and you might find some tutorials on how to solder copper pipe to fittings.

Maybe tomorrow I'll take it apart and take some pictures.
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 23, 2007 3:19 am

I can also shoot AAA batteries and whatever else I find that fits in the barrel. I just haven't made any videos or taken any pictures.


If you do make videos, they're always welcome here :)

What's the maximum pressure you've used it at? The construction looks like it could take 200 psi easily, that's a fair bit of pumping but the power benefits will make it worthwhile.
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Unread postAuthor: Hotwired » Sun Sep 23, 2007 5:19 am

Pete Zaria wrote:
LikimysCrotchus5 wrote:Also what do you use to glue together copper pipes. and i am interested in making one of these copper guns but i just wna to know a little more on how to make that piston valve of yours. Maybe a diagram and a step-by-step instruction. That would be greatly appreciated. Thx. And pictures of the piston too.


Copper is soldered (sometimes called sweated) or brazed using a propane/MAPP torch and solder, not glued. They *could* be connected by epoxy or etc... but that won't hold anywhere near as much pressure. Properly soldered copper joints should hold 250+psi.


I believe soldered joints hold whatever the pipe does. As for gluing there is a specific type of glue called JustForCopper which holds up to 500psi when used in endfeed fittings with pipe.
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Unread postAuthor: dauphinoise potato » Sun Sep 23, 2007 5:59 am

sweet cannon! What range are you getting?
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It's all a bunch of tree huggin' hippie crap!
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Unread postAuthor: spud yeti » Sun Sep 23, 2007 6:33 am

very nice cannon. It looks like it has some super damage potential. Good work :D
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really good quote/phrase here
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Unread postAuthor: LikimysCrotchus5 » Sun Sep 23, 2007 12:32 pm

My bad i knew that, that was a dumba$$ thing to ask i just forgot. :lol:
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