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Pneumatic 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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Pneumatic piston?

Unread postAuthor: acs2997 » Thu Jan 03, 2013 7:36 pm

Has anyone tried making a piston that pushes when pressurized and retracts when the pressure is relieved? I was thinking of integrating one into my gun, but i want to know the practicality of it before spending (more) money on making one.
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Unread postAuthor: matti » Thu Jan 03, 2013 7:53 pm

Could you be a little more specific on what part of the cannon you mean, valve or loading system or what piston ?
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Unread postAuthor: acs2997 » Thu Jan 03, 2013 7:56 pm

reloading system, not as a valve. I mean one that is completely sealed that acts just as a hydrolic piston
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Unread postAuthor: matti » Thu Jan 03, 2013 8:06 pm

Not sure how are you going to integrate it, but cant you use small pneumatic cylinder for that ? they make ones just like you described
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Unread postAuthor: acs2997 » Thu Jan 03, 2013 8:13 pm

how much do they sell for?
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Unread postAuthor: matti » Thu Jan 03, 2013 8:20 pm

You can find cheap ones from ebay, or local scrap metal yards that sell all kinds of stuff.. I have many cylinders that i bought at about 2-5euros each.

From what you have described I would think that you should look for single acting cylinders.. opens with pressure and returns with spring.
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Unread postAuthor: acs2997 » Thu Jan 03, 2013 8:21 pm

thanks! that saves me the stuggle of making my own!
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Unread postAuthor: CS » Thu Jan 03, 2013 10:22 pm

Single acting:
https://www.surpluscenter.com/sort.asp? ... yword=ACSA

Double acting:
https://www.surpluscenter.com/sort.asp? ... yword=ACDA

Check eBay of course, but these guys sell them pretty cheap.
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Unread postAuthor: acs2997 » Thu Jan 03, 2013 10:28 pm

Thank you so much! these websites are perfect! To be honest, I hate eBay. I've never had a good experience with them. This seems perfect. I'm sure I can find one to use.
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