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air fill system and piston sealing

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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air fill system and piston sealing

Unread postAuthor: uncomplientspud » Fri Jun 20, 2008 10:47 am

Hey guys

Going to get my new cannon built this weekend. Found all my new pipe i will need.

Only questions i have are:

What is a reliable way to fill the chamber with air? Bike valve, quick connect?

From what i have seen with the piston diagrams, i have noticed one thing. If i use say a 1 inch barrel, won't i need a t that is larger than 1 inch?. Is i use a 1 inch t won't that prevent me from sealing the piston to the barrel? Maybe it's just me

Any help would be great
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Unread postAuthor: Carlman » Fri Jun 20, 2008 10:54 am

for a 1" porting piston valve you will need a T bigger than 1" so there is enough air to push the piston back.
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Unread postAuthor: pizlo » Fri Jun 20, 2008 4:55 pm

I would recommend going at least 1.5 down to 1.
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Unread postAuthor: spud yeti » Sat Jun 21, 2008 1:28 pm

to fill the chamber it depends on what you have.
A bike pump: pump
Compressor: quick connect
Your lungs: quick connect :D
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really good quote/phrase here
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