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MINI troubles

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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MINI troubles

Unread postAuthor: urgle the danish cow » Sun Apr 08, 2012 12:15 pm

I have been trying to make a few mini co-axial piston valve guns and have not been succeeding very much. the problem i keep having is that the piston will seal but it wont pilot? i am using a schrader valve to fill and pilot and my pistons have all been machined nylon with rubber sealing faces. what am i doing wrong?
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Unread postAuthor: streetfire » Sun Apr 08, 2012 12:23 pm

maybe the air isn't getting past the piston so there is nothing to fire make a small cut in the piston to let air through
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Unread postAuthor: urgle the danish cow » Sun Apr 08, 2012 12:25 pm

streetfire wrote:maybe the air isn't getting past the piston so there is nothing to fire make a small cut in the piston to let air through

its under size, the tube inner diameter is .478 and my piston is .465
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Unread postAuthor: Brian the brain » Sun Apr 08, 2012 1:54 pm

That littlebit of blowby could be huge in comparison.
How big is the barrel?
If that takes up a large portion of the sealing face and you have blowby...

well.....
there's your problem..

If you are able to machine the pistons, why not add a floating O-ring that works like a checkvalve..
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: urgle the danish cow » Sun Apr 08, 2012 5:54 pm

Brian the brain wrote:That littlebit of blowby could be huge in comparison.
How big is the barrel?
If that takes up a large portion of the sealing face and you have blowby...

well.....
there's your problem..

If you are able to machine the pistons, why not add a floating O-ring that works like a checkvalve..


what do you mean? and the barrel is 6mm
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 08, 2012 5:57 pm

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