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Finnaly The 2SVGBG

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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Finnaly The 2SVGBG

Unread postAuthor: LCTChamp » Wed Mar 11, 2009 7:12 pm

First of I want to thank everyone who helped me modify this valve. The name stands for 2" inch sprinkler valve golf ball gun. I ordered the valve 4 months ago without even an idea of what gun to build. I would have had this finished, but I was waiting for my golf ball barrel from BCArms. It took 2 months to get here! Enough rambling here are some specs and pics.

Specs:

Valve: 2" Sprinkler Valve
Pilot: 3/8" ball valve ( I plan to upgrade to a QEV in the near future)
Fill valve: Schrader
Barrel: 4' of 1 1/2" sdr 21 golf ball barrel. ( I will be getting a tennis ball barrel soon!)
Chambers: 2-2"x36"
Usual operating pressure: 60-120psi

Sorry the pics are blurry but my camera is crap. Damage pictures and videos will hopefully be up tomorrow.

I currently don't have the golf ball barrel sleeved. Is it still safe to shoot at 120psi?
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valve, pilot, gauge, fill valve.jpg
full view 2.jpg
Full view.jpg
close up of valve and pilot.jpg
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Unread postAuthor: jonnyboy » Wed Mar 11, 2009 7:33 pm

Nice gun the sprinkler looks nice. Where did you get it?

I wouldn't waste my money on a qev, I would build a piston valve that pilots off a blowgun.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: LCTChamp » Wed Mar 11, 2009 7:40 pm

I got the sprinkler valve of ebay. It cost me $48. Well I have limited tools so it's hard to make a piston. I am going to make a QEV gun anyway, so I could just unscrew it and use it as a pilot also.
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Unread postAuthor: jonnyboy » Wed Mar 11, 2009 7:50 pm

lctchamp wrote:I got the sprinkler valve of ebay. It cost me $48. Well I have limited tools so it's hard to make a piston. I am going to make a QEV gun anyway, so I could just unscrew it and use it as a pilot also.

The piston on my gun is epoxy that was cast in the some id pipe.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: LCTChamp » Wed Mar 11, 2009 7:52 pm

jonnyboy wrote:
lctchamp wrote:I got the sprinkler valve of ebay. It cost me $48. Well I have limited tools so it's hard to make a piston. I am going to make a QEV gun anyway, so I could just unscrew it and use it as a pilot also.

The piston on my gun is epoxy that was cast in the some id pipe.


I may go this route.
Do you think it is safe to shoot at 120psi even though the barrel isn't sleeved?


Edit: Horay!!! 100th post :wav:
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Unread postAuthor: jonnyboy » Wed Mar 11, 2009 8:01 pm

lctchamp wrote:
jonnyboy wrote:
lctchamp wrote:I got the sprinkler valve of ebay. It cost me $48. Well I have limited tools so it's hard to make a piston. I am going to make a QEV gun anyway, so I could just unscrew it and use it as a pilot also.

The piston on my gun is epoxy that was cast in the some id pipe.


I may go this route.
Do you think it is safe to shoot at 120psi even though the barrel isn't sleeved?


Edit: Horay!!! 100th post :wav:

sdr 21 is rated above 120 psi I think. Make sure to double check. If it is as long as you don't have barrel flex you should be fine, although I don't think I saw any in your pictures

Oh and holding the camera still may get you better pictures.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: Fnord » Thu Mar 12, 2009 9:47 am

Ictchamp: I use my unsleeved gb barrel all the time. I've never had any problems, even when shooting in sub-freezing temperatures (note that I always use eye protection though).
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Unread postAuthor: Carlman » Thu Mar 12, 2009 10:24 am

very nice work mate! damage needed though!
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Unread postAuthor: LCTChamp » Thu Mar 12, 2009 3:01 pm

Carlman wrote:very nice work mate! damage needed though!


Thank you! Unfortunately I don't have anything to destroy at the moment, so damage will have to wait. I assure you it will come.

I stopped into my hardware store to see if they had some 2 1/2 pipe. The guy working is a close friend of mine and he said they had it in conduit. So he cut me a 4' piece, and I asked how much. He said take it it's on the house as long as you let me shoot it later. So as soon as I get a 2 X 2 1/2 reducer I'll be shooting tennis balls.
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Unread postAuthor: LCTChamp » Sat Mar 21, 2009 1:53 pm

Well I hooked up my compressor today and let the gun fill for about thirty seconds. I looked at the gauge and it said 0 psi. The air was going straight through the barrel. I took the valve apart and cleaned the diaphragm, but it still leaks :evil:. Does anyone have any idea what the problem could be?
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