Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
at last i build a piston valve and he work great
it's 3/4" T copper (or bras !!)
the piston made from wood , sweeper stick turn it on a lathe and he is about 18mm
and here is the video hoe fast he dump the air. the pressure is about 130 psi
dont forget to watch the video in HD .you know how
[youtube][/youtube]
Attachments
the piston
Picture 001 (Medium).jpg (33.78 KiB) Viewed 6582 times
Last edited by far_cry on Fri May 22, 2009 5:04 pm, edited 1 time in total.
Your Piston looks friggin' beautiful lol. It' looks so cleanly built.
Nioce Job.
It's Nerf or Nothing.
Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
i love my work to look beautiful so this take time
thank you
Gippeto wrote:Very nice job Far Cry.
You may have some trouble with the sealing face being retained at higher pressures, but only time (and pressure) will tell for sure.
You did a nice job rounding the piston seat too.
:thumbright: :thumbright:
and Gippeto thanks for the compliment
and what you did mean by You may have some trouble with the sealing face being retained at higher pressures
so may i have some leaks or the seal face stuck ? if so what i can do,, and the piston is temporary from wood .i will turn one from hard plastic or aluminium
Could probably cut down on Pilot volume in the back, And use a smaller Ball valve, But otherwise I'm Envious.
Whatcha gonna put it on?
Envious you can do this too, its easy
and the pilot volume is big , i know i just test the piston valve ,it's a temporary install.
and the pilot valve , i want to make i hammer valve to pilot the piston like Gippetos canon
the air gun will take some time to build the stock mostly
[quote="Gippeto"]You may have some trouble with the sealing face being retained at higher pressures quote]
What I mean;
With my bbgun, the teflon seat was "sucked" right out of the hole it was pressed into. This would seem to demonstrate that the flow creates a vacuum at the front of the piston.
Your sealing face "may" be pulled over the head of the screw by the flow.
If this does present itself as a problem, you could turn a washer from teflon or some other softer plastic (hdpe?) to use as the sealing face.
Harder sealing surfaces take more work to be successful, but also yield some small improvements in performance.
The screw should then be entirely adequate.(This was the case with my bbgun.)
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Very nice gun Far_Cry. I love it. Be careful with the piston though. I used lathed timber for a while until the wood swelled from the condensed air and vapor and the piston completely got stuck.
I solved this problem by putting on a coating of "super glue" to more or less seal it.
I now use hand machined aluminum. It's very easy to machine on a wood lathe, it just takes a little more time.
turn it on a lathe and he is about 18mm
