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first pneumatic

Built a miniature cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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first pneumatic

Unread postAuthor: ilovefire » Mon Jul 26, 2010 2:50 am

hey, this is my first ever pneumatic that i made today. i would like to know what you guys think for a first and also a guess at what pressure it can take if i get a shock pump, its all aluminum. the barrel is fixed with at least 10mm plug of epoxy and about the same for the schrader, as of yet have only tested it to 80psi, thats as much as my dads compressor goes to :roll:

barrel; 340mm x 6mm OD 3mm ID
chamber; 240mm x 12mm OD 10mm ID
piston; 10mm x 10mm OD aluminum tube filled with epoxy, rubber face and rubber washer backstop
valve; schrader

[youtube]http://www.youtube.com/watch?v=UDFtjC-Uch4[/youtube]
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Last edited by ilovefire on Wed Aug 04, 2010 2:19 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 3:21 am

Looking very good, if the epoxy is done properly it will very happily take the 400 psi a shock pump will give you and you will feel the difference in power, especially in such a small calibre :)

Do you plan on making a grip for it? Something like a simple trigger lever will work nicely:

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Unread postAuthor: Crna Legija » Mon Jul 26, 2010 3:22 am

if you casted the epoxy right it should take 300psi fine
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Unread postAuthor: ilovefire » Mon Jul 26, 2010 3:40 am

jackssmirkingrevenge wrote:Looking very good, if the epoxy is done properly it will very happily take the 400 psi a shock pump will give you and you will feel the difference in power, especially in such a small calibre :)

Do you plan on making a grip for it? Something like a simple trigger lever will work nicely:

Image


400! cool that should be good, now i just have to get me one of those shockes!
and yea i thought of making a handle but but i didnt know about how i would fill it once its attached, any ideas?
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Unread postAuthor: theBOOM » Mon Jul 26, 2010 3:49 am

It's right there in Jack's diagram, you actually have a separate chamber and then you have the actual valve on the top (piston and then you have the barrel). The fill valve is on the bottom chamber and the actual pilot valve is attached to the trigger.
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 26, 2010 4:26 am

theBOOM wrote:The fill valve is on the bottom chamber and the actual pilot valve is attached to the trigger.


Alternatively you can have a setup where the chamber assembly is removable for filling.
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