SpudFiles

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

Great damage!!
Looking good so far

More details please. Maybe a video???

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

what would you like to know more ?

I will post a vid as soon as possible

Operating pressure, parts measurments, is that a steel plate your cutting ammo from? The details.

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 ... 5344293063[/GVideo]
haha you can hear my dad it actually sounds fairly quiet but it is very loud inside my room without the barrel attached.

Edit by jrrdw

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!

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?