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My New Gun

Built a pneumatic 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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My New Gun

Unread postAuthor: pnematicrookie » Wed Jan 30, 2008 1:32 pm

this is my new gun...all i did was take my last gun apart and just used spare parts i already had....for some reason i can only get it to like 105 psi, i figured it would get way higher than that because of all the chamber i have. any suggestions?
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whole gun
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PIC-0230.jpg
sprinkler valve/blowgun connection
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PIC-0231.jpg
PIC-0231.jpg (17.2 KiB) Viewed 678 times
PIC-0232.jpg
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pnematicrookie
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Unread postAuthor: STHORNE » Wed Jan 30, 2008 4:13 pm

what happens when you increase the pressure past 105psi?

if it produces leaks, i suggest that you cover all joints and fittings with epoxy or JB Weld.

i had the same problem with my copper pneumatic and JB Weld fixed 'er right up! now instead of 60psi, i can go 120+

hope i helped :wink:
--sthorne
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Last edited by STHORNE on Wed Jan 30, 2008 4:19 pm, edited 2 times in total.
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Unread postAuthor: pnematicrookie » Wed Jan 30, 2008 4:16 pm

yeah its probably a leak somewhere, ill try that tho...thanx
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Unread postAuthor: STHORNE » Wed Jan 30, 2008 4:18 pm

sure....u know how to find where the leak is?
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Unread postAuthor: Hotwired » Wed Jan 30, 2008 4:21 pm

Drown it in a bath :)
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Unread postAuthor: STHORNE » Wed Jan 30, 2008 4:23 pm

yup, lol...its an old method but its free and easy
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Unread postAuthor: Maniac » Wed Jan 30, 2008 4:30 pm

i would upgrade to a qev or some kind of piston valve since you have such a large steel chamber.
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Unread postAuthor: pizlo » Wed Jan 30, 2008 4:50 pm

yeah I guess you could make a coax with a bit of tinkering, and then you can really out on the pressure.
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Unread postAuthor: daberno123 » Wed Jan 30, 2008 4:53 pm

Right now the limiting factor on it's pressure is the sprinkler valve. I second Maniac's idea of a QEV or piston since they can be used at higher pressure than a sprinkler
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Unread postAuthor: Hubb » Wed Jan 30, 2008 5:55 pm

Agreed. You are holding the potential of this launcher back with the sprinkler. Replace it with a QEV (which will probably easier than building a piston for this setup) and see what it can really do.
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Unread postAuthor: pnematicrookie » Thu Jan 31, 2008 8:31 am

where the heck do i get a QEV from?! im new to this lol
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Unread postAuthor: jrrdw » Thu Jan 31, 2008 9:35 am

Google them, Ebay (sometimes). Does McMaster carry them???

Forgot to say nice cannon. Nice cannon! Welcome to Spudfiles. Any damage pics or video's?
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Unread postAuthor: pnematicrookie » Thu Jan 31, 2008 5:02 pm

thanx, but no damage pics yet...but this isnt my first gun by the way...i believe its my...fourth, im just experimenting to see what i come up with...so i'll try this QEV thing out lol
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Unread postAuthor: potatoflinger » Thu Jan 31, 2008 5:16 pm

Another place where you can get a QEV is here:
http://www.fastenal.com/web/products.ex ... m_search=1
They are pretty reasonable as long as you don't get the 1" valve.
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Unread postAuthor: pnematicrookie » Thu Jan 31, 2008 10:14 pm

thanx, yeah that 1" valve is ridiculous, i would just rather buy a real gun lol
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