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My GB cannon

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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Should I make a removable sch80 muzzle break

Yes
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No
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Total votes : 14
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My GB cannon

Unread postAuthor: jor2daje » Sat Sep 19, 2009 9:10 pm

I got my sdr21 yesterday so today I got some 2" sch 80 and made a golfball gun. The pics are self explanatory but this is my favorite gun to date because I think I finally found my balance between chamber size (I only have a little compressor), calibre (tennis balls are too big, nails and bb are a little small), and size (it can easily fit in my car). \

UPDATE: I built my breech today, its really straight forward, a hole in the barrel the size of a golfball and a piece of sch80 that slides over it. The hole has some tape inside to act as a detent so the ball doesnt roll out of the barrel. After putting the breech on I sorta feel like adding a sch80 muzzle break to get the white and grey fittings of different sizes on the gun. Tell me what you think.

Specs:
Its a 1 1/2" porting in a 2" tee, sdr21 for the barrel, and 2" sch80 for the chamber, I used sch80 because I got a great deal buying it by the length so I have tons left over, and because its rated to 400 psi. Pilot is a 3/4" sprinkler piloted by a blow gun. After my tennis ball gun leaked a little where I attached the quick connect I decided to sacrifice some pilot volume (sorry jsr :D) and get a perfect seal using threaded joints and bushings. My piston is a 1 1/4" end cap with a round piece of rubber tile on it, I used the same shopping cart bumper as I did on my tennis ball gun.

Breech loading should come tomorrow I just have to sand down the inside of my sch80 cause the fit is slightly too tight.

Only a few damage pics for now because I only made it today so I only went to 40 psi until Im confident the cement has completely cured. I promise Ill up the pressure and the damage.

Any feedback/ recommendations welcome, the tape one the barrel and pilot supports will be replaced with hose claps hopefully tomorrow.
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Attachments
frontwayson.jpg
How nicely golf balls fit in the barrel.
sideviewofgbgun.jpg
the whole gun
thevalveandpilot.jpg
rear end of the gun
gbdamage.jpg
entry into 3/4" particle board at 40 psi, the first shot went through, the second went through and shattered the board.
gbdamageexit.jpg
the exit
fullsideviewwithbreech.jpg
Now with breech
gbbreechopen.jpg
damagetolittlestereo.jpg
GB went through both sides of this little stereo thing.
Last edited by jor2daje on Sun Sep 20, 2009 12:46 pm, edited 1 time in total.
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Unread postAuthor: JDP12 » Sat Sep 19, 2009 9:13 pm

Very nice cleanly built gun!! I Love it!
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Unread postAuthor: Mitchza89 » Sat Sep 19, 2009 10:12 pm

Beautiful mate, it looks amazing. Job well done!
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Unread postAuthor: spudtyrrant » Sat Sep 19, 2009 10:19 pm

nice job, man you should have included the feet then we might see some fireworks when jsr gets around here :D
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Unread postAuthor: jor2daje » Sat Sep 19, 2009 11:04 pm

Thanks guys

haha spudtyrrant ill add some feet when I take the picture of the breech I put halfway down the barrel so I have lots of deadspace :D
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Unread postAuthor: MrCrowley » Sat Sep 19, 2009 11:06 pm

Only a few damage pics for now because I only made it today so I only went to 40 psi

Can't that put air pockets in the weld and make them a lot weaker?

I heard that somewhere before, regardless I still wouldn't subject a PVC weld to pressure before the 24 hour cure time is up.

Anyway, looks nice. Glad to hear it seems to be working wonderfully.
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Unread postAuthor: jor2daje » Sun Sep 20, 2009 12:50 am

Mcrowley that possible so thanks for the heads up but I did wait like 10 hours before even going to 40 and on some older guns I have pumped up before the 24 hours and never had one break. I think air bubbles could only form in the first few hours when the glue is either still liquid or a goo. Thanks
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Unread postAuthor: qwerty » Sun Sep 20, 2009 2:22 am

Looks good, but what pressure WILL you be running at? cause i cant wait to see some good damage pics and maybe could you do a video? pretty please! :)
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Unread postAuthor: geniusbomberman » Sun Sep 20, 2009 9:49 am

You should maybe use some of that sch 80 2" on your barrel, as thinwall sdr 21 might not be strong enough
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 20, 2009 9:58 am

spudtyrrant wrote:nice job, man you should have included the feet then we might see some fireworks when jsr gets around here :D


Why do you torture me so :roll: :D

Nice job, simple, neat, looks good and works well :)
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Unread postAuthor: jor2daje » Sun Sep 20, 2009 10:09 am

Geniusbomberman I dont think I need to sleeve my barrel, for one thing it makes breech loading more difficult and my sdr21 is rated to 210 psi so i think its only necessary to sleeve my barrel if its so long it starts drooping.
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Unread postAuthor: jor2daje » Sun Sep 20, 2009 12:47 pm

Sorry for double post but UPDATE, I made the breech and added a damage pic, more to come.
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Unread postAuthor: spudtyrrant » Sun Sep 20, 2009 1:02 pm

jackssmirkingrevenge wrote: Why do you torture me so :roll: :D
jack..jack..jack....you only torture yourself to make me look bad http://www.youtube.com/watch?v=Fk2fDJPS ... re=related :D
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Unread postAuthor: mark.f » Sun Sep 20, 2009 1:59 pm

Looks great! Nice, solid, reliable design.
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Unread postAuthor: geardog32 » Sun Sep 20, 2009 10:30 pm

that is the most appealing way of using a sprinkler valve for porting i have ever seen. it may inspire me to use a sprinkler on my piston valve. very good job.
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