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*UPDATE 8/13/08* Pnuematic Shank

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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Total votes : 10
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Unread postAuthor: blind909 » Wed Aug 13, 2008 1:39 pm

frankrede wrote:1/2" punch, 1 1/4" cylinder


Cool, but what is it made of, what kind of metal or plastic?
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Unread postAuthor: frankrede » Wed Aug 13, 2008 1:58 pm

Since its my prototype its made out of pvc
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Unread postAuthor: blind909 » Wed Aug 13, 2008 1:59 pm

frankrede wrote:Since its my prototype its made out of pvc


You are using unregulated CO2 in PVC? Doesnt sound too safe.
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Unread postAuthor: frankrede » Wed Aug 13, 2008 2:03 pm

Oh no no, I have a Palmer regulator for it
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Unread postAuthor: blind909 » Wed Aug 13, 2008 2:06 pm

frankrede wrote:Oh no no, I have a Palmer regulator for it


Oh, that sounds better.
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Unread postAuthor: blind909 » Wed Aug 13, 2008 2:12 pm

Here is the newer version, IMO, its much, much cleaner, and just as deadly, but less air efficeint. the cylinder is 3/4 inch, same shank, just a larger piston, and I added a Coleman Pouch to my air setup to store the 3 foot hose.
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Attachments
PnuematicCylinderV2 001.jpg
PnuematicCylinderV2 002.jpg
PnuematicCylinderV2 003.jpg
PnuematicCylinderV2 004.jpg
PnuematicCylinderV2 005.jpg
Shank.JPG
TheShank.JPG
TheShank.JPG (33.01 KiB) Viewed 492 times
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Unread postAuthor: Hubb » Wed Aug 13, 2008 2:26 pm

If you call it a window punch, it becomes legal :wink:
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Unread postAuthor: xboxteen01 » Wed Aug 13, 2008 4:52 pm

Someone already pointed out the use from No country for Old men. But the movie Smoking Aces had a similar device that one guy used. Pretty cool though
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Unread postAuthor: blind909 » Wed Aug 13, 2008 10:11 pm

I am going to add a leg strap for the air tank, so I can run around with it, terrorising little kids :twisted:, JK, lol. But I will add a leg strap.
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Unread postAuthor: frankrede » Wed Aug 13, 2008 10:12 pm

Heres mine:/<a href="http://s30.photobucket.com/albums/c325/redensekjf/?action=view&current=1218673274.jpg" target="_blank"><img src="http://i30.photobucket.com/albums/c325/redensekjf/1218673274.jpg" border="0" alt="Photobucket"></a>
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Unread postAuthor: blind909 » Wed Aug 13, 2008 10:42 pm

Wow Frank, thats pretty nice, Are those lathed fittings? And could we get internal pics? How fast does it move? And what pressures do you use? That would look really nice with a good paintjob :wink: And you might want to consider adding a bumper at the end of your cylinder, because with mine the piston will slam up against the 1/4 inch coupling and break the bond of the epoxy I put on there.
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Last edited by blind909 on Wed Aug 13, 2008 10:48 pm, edited 1 time in total.
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Unread postAuthor: blind909 » Wed Aug 13, 2008 10:45 pm

hubb017 wrote:If you call it a window punch, it becomes legal :wink:


What do you mean? Is it illegal now?
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Unread postAuthor: frankrede » Wed Aug 13, 2008 11:04 pm

blind909 wrote:Wow Frank, thats pretty nice, Are those lathed fittings? And could we get internal pics? How fast does it move? And what pressures do you use? That would look really nice with a good paintjob :wink: And you might want to consider adding a bumper at the end of your cylinder, because with mine the piston will slam up against the 1/4 inch coupling and break the bond of the epoxy I put on there.
They are all stock fittings that have been lathed for flush fits. It doesn't move fast enough, I could barely get it to put small indentations in a piece of wood. I need a faster valve.
I think I am done with this project until I get a metal lathe, then I will make it out of aluminum and make it look real nice and run it at a few hundred psi:D
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Unread postAuthor: Lentamentalisk » Thu Aug 14, 2008 12:26 am

well you are using a rather tinsy diameter hose (and going through a quick connect) at a low pressure, but having a huge barrel diameter... I would just make a bit of a reservoir behind the ball valve. The one I was planning would actually be a coaxel with a diaphragm, equalization whole, and maybe a poppit valve for easy firing. I will have to make diagrams at some point.
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Unread postAuthor: blind909 » Thu Aug 14, 2008 11:53 am

I think yours opens too slow because your cylinder is 1 1/4 inch, and your valve is 1/4 inch, so It constiricts flow alot. Mine opens extremely fast, and can even put a hole through 1/2 inch plywood. And Frank, do you have to push your rod back down, or do you have a spring or something there to push it back for you?
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