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my first piston valve

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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my first piston valve

Unread postAuthor: sniper hero » Sat Feb 14, 2009 9:39 am

I made today a piston valve I planned to make quite a while.
I had to deconstruct one of my guns but it's no problem for me

specs:
the piston is made of hot glue and a rubber ring.
all in a 3/4 T-piece
the piston slides in a 3/4 nipple
the opperating pressure is around 11bars (sometimes 14 sometimes 8)
it's filled by a regular bike tire valve(opens easily so I need some good pumps before the piston seals
the chamber is made from 350mm of 28mm copper pipe with an endcap soldered on.


I did some test shots:D
pics of one shot through 3 metal plates(thin), it left a big mark on the wooden back stop.
the ammo was just a fast put together thong made of a quickdisconnect fitting a piece of plastic pipe and some tape to fill up the hole.

please comment and ask your questions
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Attachments
CIMG1209.JPG
sealing pipe
CIMG1210.JPG
gun
CIMG1212.JPG
piston
CIMG1213.JPG
getto ammo
CIMG1214.JPG
first plate
CIMG1216.JPG
second plate
CIMG1218.JPG
third plate
Last edited by sniper hero on Sat Feb 14, 2009 1:27 pm, edited 2 times in total.
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Unread postAuthor: Brian the brain » Sat Feb 14, 2009 10:05 am

Great damage!!
Looking good so far
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Unread postAuthor: jrrdw » Sat Feb 14, 2009 10:09 am

More details please. Maybe a video???
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Unread postAuthor: sniper hero » Sat Feb 14, 2009 10:24 am

jrrdw wrote:More details please. Maybe a video???


what would you like to know more ?

I will post a vid as soon as possible
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Unread postAuthor: jrrdw » Sat Feb 14, 2009 12:44 pm

Operating pressure, parts measurments, is that a steel plate your cutting ammo from? The details.
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Unread postAuthor: sniper hero » Sat Feb 14, 2009 1:33 pm

I added some specs in the first post
I plan some improvements and will show as soon as I finished them.
because of some problems uploading a video I'll put it on video google and put a link here.

EDIT: [GVideo]http://video.google.com/videoplay?docid=4097735935344293063[/GVideo]
haha you can hear my dad :D it actually sounds fairly quiet but it is very loud inside my room without the barrel attached.

Edit by jrrdw
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Last edited by sniper hero on Sat Feb 14, 2009 6:02 pm, edited 4 times in total.
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Unread postAuthor: psycix » Sat Feb 14, 2009 1:34 pm

Very nice!
Good job on that piston.
Does it slide in a pipe or just in the T?

EDIT:
Ah you just edited the answer into your post! :D
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Unread postAuthor: ramses » Fri Feb 20, 2009 3:33 pm

nice gun! you would definitely get better performance if you enlarged the porting on the piston valve.

can I ask how you got whatever you used for the sealing pipe into the back of the bushing? dremel?
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