Plans for a piston gun.

[elad311]

I was cleaning my computer when I came across with those plans for
a piston gun:
I'm guessing that the grey part is the piston and the ratio between the barrel and the comber is 1:2.
Do you think it will work?

[velocity3x]

Although very crude, it can work if constructed properly.

[RabidDuck]

you may want to change that ball valve out for a modded sprinkler valve with a blow gun, for your pilot.

[jackssmirkingrevenge]

I'm guessing that the grey part is the piston and the ratio between the barrel and the chamber is 1:2

More like 1:4

Do you think it will work?

The piston needs to be longer, as it is the chamber will just empty through the pilot, also there's too much dead space.

[Gippeto]

Might want to give some consideration to creating differential area (piston) as well as Jacks suggestions.

[psycix]

1:1 will be enough.

The piston valve won't work that way. It needs to seal onto a porting.
This is just a T with a piston in it, not a piston valve.
Check out the "piston valves explained visually" thread for more information on how piston valves work.

[Gun Freak]

there is no need for the ball valve on the bottom.

[psycix]

Only if you are using a shrader to fill.
If you are using a quick connect, you'll have to close it before disconnecting. However, you could vent through the quick connect, and leaving the top BV out.
Saves a lot of pilot volume. (T and two elbows)

Kinda old thread you dug up though.

[Gun Freak]

Oh my bad Didn't realize. This thread was at the top of the Pneumatic Cannon Discussion