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Anyone able to help me build Cobblers marshmellow gun-Piston

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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Anyone able to help me build Cobblers marshmellow gun-Piston

Unread postAuthor: jfullr97 » Thu Jun 07, 2012 1:01 am

I have recently constructed cobblers marshmallow gun, COPIED EVERYTHING AND AIR WENT RIGHT OUT THE BARREL!, got me angry lol. So I am wondering if anyone has a simple design for me to make a piston air gun. Preferable 1/2" barrel.

Thanks, P.S. im new!

Jordan
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Unread postAuthor: jackssmirkingrevenge » Thu Jun 07, 2012 2:22 am

The idea generally is that air goes out of the barrel :)

It sounds like your piston isn't sealing, could be a number of reasons - posting pictures will help us help you ;)

If you want a simple solution, a 3/4" or 1" sprinkler valve will offer excellent performance for a 1/2" barrel.
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Unread postAuthor: jfullr97 » Thu Jun 07, 2012 5:34 am

Yeah I have won that is already moddified for my tennis ball cannon, it is a 1" sprinkler valve with a blowgun and jb weld in the solinoid valve spot.

Thanks :P

But does anyone know how to make a piston air rifle or is it a good idea to not use PVC for these smaller guns? :roll:
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Unread postAuthor: jackssmirkingrevenge » Thu Jun 07, 2012 5:50 am

For smaller guns, I highly recommend a commercial QEV:

http://www.spudfiles.com/forums/semi-au ... 23626.html

dead cheap and very effective, and it saves you the heartache of making your own piston valve with limited tooling and materials.
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Unread postAuthor: Gippeto » Thu Jun 07, 2012 1:44 pm

jfullr97 wrote:But does anyone know how to make a piston air rifle....:roll:


What an odd question to ask on this site. :lol:
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Unread postAuthor: jfullr97 » Fri Jun 29, 2012 12:33 am

I think Ive given up on making a piston gun, never going to work lol
:(
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Unread postAuthor: jackssmirkingrevenge » Fri Jun 29, 2012 3:10 am

Then let someone else make it for you, for less than $20" posted!

http://www.ebay.com/itm/NEW-PARKER-QUIC ... 460474d0d0
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