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 Help with a mini piston coax « View previous topic :: View next topic » 
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brplatz
PostPosted: 05/05/2008 19:53 PM    Post subject: Reply with quote

Sergeant Major
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Joined: 21 Mar 2008
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ok cool i have seen the tutorial or something on how to make one of those so i think i will have to make one. but i still dont think this pvc will hold 300 psi or more.
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Sticky_Tape
PostPosted: 05/05/2008 19:59 PM    Post subject: Reply with quote

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Did you look at the edit in my post that stated to use those pressures?
I also said to make one out of copper.
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brplatz
PostPosted: 05/05/2008 20:23 PM    Post subject: Reply with quote

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ok cool i just saw the edit lol

i just missed it lol.

i have some steel in the garage, maybe that will work?
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kablooie
PostPosted: 05/05/2008 20:49 PM    Post subject: Reply with quote

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Joined: 18 Feb 2007
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I have a half inch coaxial that I recently made, and had trouble with the piston too. My solution was an epoxy piston with three layers of craft foam (see picture or goodle it) that I had lying around. It now seals at ~15 psi and the power is amazing (went through 4 coke cans). The foam is not the toughest stuff, and if you have a sharp barrel it will be shredded pretty quickly, but as a semi-short term solution it is totally worth it. Good luck!

http://www.guildcraftinc.com/images/products/full/353-867%20Foam%2012x 18%20Asst.jpg
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FordGtMan
PostPosted: 05/05/2008 21:27 PM    Post subject: Reply with quote

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Joined: 25 Oct 2007
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the problem probably was that your barrel wasnt lined up perfectly and that screw hit the barrel instead the seal. happened to me twice. Sad
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brplatz
PostPosted: 05/05/2008 22:30 PM    Post subject: Reply with quote

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FordGTMan you were right. the second one i make i made it much better and it is lined up perfectly. now it seals and fires perfectly. except i have a leak and cant find and epoxy. Very Happy
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FordGtMan
PostPosted: 05/05/2008 22:40 PM    Post subject: Reply with quote

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put it in some water. you can easily spot it then Smile
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OuchProgramme
PostPosted: 05/05/2008 22:50 PM    Post subject: Reply with quote

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brplatz wrote:

i have some steel in the garage, maybe that will work?


Most definately.

High pressure co-axel
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