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co-axial questions

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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co-axial questions

Unread postAuthor: super spuder » Sat May 26, 2007 11:40 am

well i am about to make my first co-axial, but i have a few questions first

#1 how far away from the barrel should the piston be when it is fully back?

#2 does the piston need to be completely sealed all the way around, cause i have a really nice hot glue piston, but it has a small leak around the side, could this work as an equalization hole?

i may have more latter, but that is all for now.
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trying to decide on a new project, probably something small.
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Re: co-axial questions

Unread postAuthor: jackssmirkingrevenge » Sat May 26, 2007 11:43 am

super spuder wrote:#1 how far away from the barrel should the piston be when it is fully back?


1/4th of the barrel diameter
#2 does the piston need to be completely sealed all the way around, cause i have a really nice hot glue piston, but it has a small leak around the side, could this work as an equalization hole?


if it's a small leak than the flow of your pilot valve then it should work
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Unread postAuthor: Velocity » Sat May 26, 2007 1:02 pm

1/4 is required for maximum flow. If I were you, I would step it up to 3/8 or 1/2, just because it can be difficult to get exactly 1/4, and if you do less, you lose power and flow.
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Unread postAuthor: mopherman » Sat May 26, 2007 1:20 pm

I too am making a coaxial and my piston keeps tumbling. i want to make a new piston, but do you think i could use a pad of duct tape for a sealing face? I heard someplace that as long as it has "give" it will work ok.
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Unread postAuthor: super spuder » Sat May 26, 2007 8:47 pm

use the rubber from an iner tube
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Unread postAuthor: VH_man » Sat May 26, 2007 8:59 pm

use that craft foam stuff you buy in miachels. works fine for me. just have to duble/triple it up so it doesnt burst.
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