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Help with a mini piston coax

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: brplatz » Mon May 05, 2008 7:53 pm

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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Unread postAuthor: Sticky_Tape » Mon May 05, 2008 7:59 pm

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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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: brplatz » Mon May 05, 2008 8:23 pm

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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Unread postAuthor: kablooie » Mon May 05, 2008 8:49 pm

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/pro ... 20Asst.jpg
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Unread postAuthor: FordGtMan » Mon May 05, 2008 9:27 pm

the problem probably was that your barrel wasnt lined up perfectly and that screw hit the barrel instead the seal. happened to me twice. :(
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Unread postAuthor: brplatz » Mon May 05, 2008 10:30 pm

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. :D
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Unread postAuthor: FordGtMan » Mon May 05, 2008 10:40 pm

put it in some water. you can easily spot it then :)
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Unread postAuthor: OuchProgramme » Mon May 05, 2008 10:50 pm

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


Most definately.

High pressure co-axel
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