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Help me Troubleshoot

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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Help me Troubleshoot

Unread postAuthor: sagthegreat » Thu Mar 08, 2012 6:31 pm

Ok I built my first Piston Valve Gun, pumped to 200 PSI and when piloted all the air burst through the back, nothing into barrel. I dont know what im doing wrong because the piston is able to move when i blow air and can move.
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 6:32 pm

Here is picture

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Unread postAuthor: Zeus » Thu Mar 08, 2012 7:07 pm

What size is the pilot? And the diameter of the piston?
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:09 pm

the pilot area is 1 inch long and the diameter of the piston is about .25mm less then the OD of the tube
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Unread postAuthor: Zeus » Thu Mar 08, 2012 7:24 pm

I meant the pilot valve, and the actual diameter of the piston.
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:27 pm

the pilot is a standed bike tire valve. outer tube is 8mm, and the piston is about 7.5 mm
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Unread postAuthor: Zeus » Thu Mar 08, 2012 7:31 pm

That's the problem, the gap around your piston is too large. Wrap some tape around it until it's a much closer fit. Them lubricate the heck out of it, and you'll be right.
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 7:41 pm

will Vaseline be a good lubricant?
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Unread postAuthor: Zeus » Thu Mar 08, 2012 7:51 pm

Yep, it won't break down the rubber. I used it before I got some decent grease.
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Unread postAuthor: sagthegreat » Thu Mar 08, 2012 9:23 pm

ok so after messing with tiny peices of tape, i got the piston so its tight enough so too much air wont leak when piloted, but loose enough for air to get past to fill the chamber.
i used a small amount of epoxy for a low pressure test tomorrow, will post a video tommorow
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Unread postAuthor: Crna Legija » Fri Mar 09, 2012 12:45 am

id got with a bigger pilot even if it works tomorrow.
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Unread postAuthor: mattyzip77 » Sun Mar 11, 2012 10:30 am

where are the pics???? Cant help you if we cant see the pics!!!
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Unread postAuthor: quark1980 » Sat Mar 17, 2012 5:12 am

i had the same isseu with a schrader as a pilot... in the end i just made my own valve to pilot te bugger....
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