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piston reattempt

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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piston reattempt

Unread postAuthor: tape fist » Mon Jan 26, 2009 12:29 am

This is my second attempt on diagramming the piston valve i want to make.Is there any problems?Im sorry i keep asking about this but i don't want to make it and find out i screwed up.thank you
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Re: piston reattempt

Unread postAuthor: DR » Mon Jan 26, 2009 12:41 am

tape fist wrote:This is my second attempt on diagramming the piston valve i want to make.Is there any problems?Im sorry i keep asking about this but i don't want to make it and find out i screwed up.thank you


Yeah, your piston's too short! :roll:

<a href="http://i42.tinypic.com/fviqyo.jpg"><img src="http://i42.tinypic.com/fviqyo_th.jpg"></a>

... :wink:

Make it like this: <a href="http://www.spudfiles.com/forums/logout=true&sid=41e8ec5d796edda8962fef9263f2cd09">Piston ReVamp</a>
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Unread postAuthor: mega_swordman » Mon Jan 26, 2009 1:20 am

DR your link does not work.

Are you going to fill the chamber through the back near the blowgun or directly into the chamber. If you are filling through the blowgun, you won't need the spring there. Otherwise it looks good.
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Unread postAuthor: inonickname » Mon Jan 26, 2009 3:27 am

http://www.spudfiles.com/forums/piston- ... t8157.html

If you could imagine your valve doing that, it should be fine. Asides from the length it all seems ok. Be cautious with threads, as they will leak.
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Unread postAuthor: MrCrowley » Mon Jan 26, 2009 3:35 am

Be cautious with threads, as they will leak.

Uh...no they wont? :?

As long as you tighten them enough with the help of a lubricant such as teflon tape, they should be fine and leak free.

@tape fist,
As long as you find a spring that can keep the piston sealed against the barrel while you fill the chamber with air, it should be fine. Assuming you're filling from the chamber and not the pilot.
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