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My GB cannon is done! ( UPDATED!!!) now with damage pics

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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what paint color?

flat black
9
38%
red
1
4%
pink
5
21%
keep it the way it is
9
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Total votes : 24
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My GB cannon is done! ( UPDATED!!!) now with damage pics

Unread postAuthor: unisonmind » Fri Sep 14, 2007 8:00 pm

after being out of town for a lot longer then i wanted. its done and it has more power then any of my guns to date. this is gun #6 and my 2nd piston valve. i went up to the mountains today to test out the power. i ran it at 150 psi and i could barely see the GB's come out and they were out of view in no time.i had some 2'x4' strips of 3/4'' plywood and a few 2''x4''x12'' in the bed of my truck from a job i did and with the plywood it would blow 3'' holes in it like nothing and from about 20' it would break the 2''x4'' in half 4 out of 5 time and the 5th was hanging on by all most nothing but everyone tell me what you think about it


specs:
-2 1/2'x3'' chamber
-4' GB barrel sdr21 & sch80
-the piston is a pill bottle filled
with foam
-valve is 2'' tee with a 1 1/2'' port
-pilot is a 1/4'' ball valve

so i just got done with the paint job and i got all the small bugs out of the valve so i put the QEV back on it gives it a little more power


<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture100.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture127.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture130.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture126.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture096.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
all shots where at 65psi
front
<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture137.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>


back
<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture138.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

inside back
<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture140.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

inside front
<a href="http://photobucket.com" target="_blank"><img src="http://i87.photobucket.com/albums/k154/unisonmind/Picture141.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
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Last edited by unisonmind on Tue Oct 30, 2007 2:15 pm, edited 4 times in total.
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Unread postAuthor: Mitchza89 » Fri Sep 14, 2007 8:04 pm

Beautifully made mate. Job well done.
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Unread postAuthor: MrCrowley » Fri Sep 14, 2007 8:06 pm

Very Nice! How'd did you get the plug to seal completely?
You should make a chamber/barrel support, it would take the stress of that elbow below the tee
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Unread postAuthor: c19o » Fri Sep 14, 2007 8:22 pm

Nice, im also interested how you got the plug to seal.
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Unread postAuthor: e1337 » Fri Sep 14, 2007 8:26 pm

Very nice, I like the pilot.

peace
e1337
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Unread postAuthor: Spuddin » Fri Sep 14, 2007 9:18 pm

very nice! looks like u have all the hard to find most wanted stuff: 2 1/2" pipe, sdr21, sch 80! sweet!!! btw do u patch the golfballs?
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Unread postAuthor: unisonmind » Fri Sep 14, 2007 9:54 pm

MrCrowley- ya i do need to make a barrel support when i was in the mountains testing i used a sock and a bungee cord.- on the back plug i have a o-ring that is a real tight fit in the tee

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Spuddin-sorry but i have no clue what you mean by patch the golfballs and i dont have any 2 1/2'' pipe its 3'' and the barrel is 1 1/2'' sdr21 & 2'' sch80
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Unread postAuthor: c19o » Fri Sep 14, 2007 9:56 pm

Oooh, so you just stick the o-ring on there and bolt it in?
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Unread postAuthor: unisonmind » Fri Sep 14, 2007 11:04 pm

there is a grove for the o-ring and i use the treads as a back stop

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Unread postAuthor: Killjoy » Sat Sep 15, 2007 1:13 am

^^Great idea, i never though of doing that.
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 15, 2007 2:54 am

straightforward, clean, good job - that looks like it could produce some damage worth posting *hint hint*
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Unread postAuthor: dongfang » Sat Sep 15, 2007 4:52 am

Hi,

Very nice cannon! A little smaller than the last one I made, but apparently more powerful! I like the simplicity and efficiency of your ball valve trigger.

Don't you have the same problem as me; the bolt holes in the tee chipping off th o-ring when putting in the plug?

Well done.

Regards
Soren
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 15, 2007 5:04 am

dongfang wrote:Don't you have the same problem as me; the bolt holes in the tee chipping off th o-ring when putting in the plug?


Presumably you could put a bevelled edge on the bolt holes to alleviate this problem?
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Unread postAuthor: unisonmind » Sat Sep 15, 2007 8:07 am

i just take the bolts all the way out of the tee when i need to get to the piston
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Unread postAuthor: dongfang » Sun Sep 16, 2007 3:56 am

Hi Jack,

It´s hard to bevel that thing from the inside, but I managed to grind them a little smoother with the Dremel. Still chips the rings though. But heck, they stay airtight even with some chips in them. Right now, I just let it happen when removing the plug, and carefully adjust in the bolts to make a smooth surface in there when putting it back in.

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