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Plans for a piston gun.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Plans for a piston gun.

Unread postAuthor: elad311 » Sat Dec 19, 2009 8:51 am

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?
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Unread postAuthor: velocity3x » Sat Dec 19, 2009 8:56 am

Although very crude, it can work if constructed properly.
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Unread postAuthor: RabidDuck » Sat Dec 19, 2009 11:36 am

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

Unread postAuthor: jackssmirkingrevenge » Sat Dec 19, 2009 1:51 pm

elad311 wrote: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.
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Unread postAuthor: Gippeto » Sat Dec 19, 2009 11:35 pm

Might want to give some consideration to creating differential area (piston) as well as Jacks suggestions.
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Unread postAuthor: psycix » Mon Dec 21, 2009 8:57 am

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.
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Unread postAuthor: Gun Freak » Mon Jan 25, 2010 7:00 pm

there is no need for the ball valve on the bottom.
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Unread postAuthor: psycix » Tue Jan 26, 2010 4:39 am

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.
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Unread postAuthor: Gun Freak » Tue Jan 26, 2010 11:21 am

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