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SGA Golf ball Gun (2" Piston), 400yards!

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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SGA Golf ball Gun (2" Piston), 400yards!

Unread postAuthor: MrCrowley » Tue Jul 03, 2007 2:13 am

Well im finally done with my latest cannon, 6months on from my last.

Its called SGA (Schutz Gewehr Assault) And yes I know what it means.
At the moment I have a short golfball barrel as thats all I had left but it will do.

SGA Specs:

Chamber:50mm(2")PN18 Body About 150cm(60") long
Barrel:40mm PN18 Golfball Barrel 80cm(30") long
Piston:Lynx Deodorant can, reinforced with 32mm(1 1/4") coupler and hot glue. Bolted on neoprene sealing face. Lubed up as well. Piston housing is a 2" tee. Serviceable piston via 4 bolts with rubber washers for sealing and a 2" end cap. Seals 99% leaks a tiny bit at the bottom bolt but so slowly it doesn't matter.
Fill Setup:10mm(3/8") ball valve with a Quick-Connect
Pilot Valve:15mm(1/2") ball valve with about 30cm of 15mm brass and galv steel pipe.
Weight:6kgs! (13 pounds) :shock:


Features:
Inter-changeable Barrels
Serviceable Piston
8psi sealing pressure
15psi actuating pressure
Comfortable design and grip

Picture Time:

See update at bottom of post for new version:
Image

SGA Over-View:
Image

Fill valve and gauge:
Image

Close Up:
Image

Piston Housing:
Image

Pilot Setup:
Image

Piston:
Image

Sealing Face of Piston:
Image

Close Up 2:
Image

Golfball Shot 330.33m in Crosswinds at 75PSI:
Image



Video Compilation Of Various Dry Fires and a Golfball Shot:
[youtube]http://www.youtube.com/watch?v=5ui987L3T10[/youtube]

Damage Video Compilation:
[youtube]http://www.youtube.com/watch?v=ljt3EXcw4T0[/youtube]

[GVideo]http://video.google.com/videoplay?docid=-3846587790500949558&hl=en[/GVideo]

Sabot Video:
[youtube]http://www.youtube.com/watch?v=PRtpK1rCqNE[/youtube]

My Instructables.com 'Launch-it' Entry:
[youtube]http://www.youtube.com/watch?v=pS7I9u4xXqQ[/youtube]

Comments and Criticism is much appreciated :P

UPDATE:

* Front grip replaced, blew up last year sometime and I didn't have a 45* eblow on me to replace it, so I had to go for a short, straight look.

* 1" modded sprinkler valve added

* Pilot volume decreased

* 3" T-Shrit barrel added

* Painted flat black.

* Golfball barrel is on another gun, i'm going to upgrade to a 1.5m one soon.


Image
Image
Image

I'll probably end up changing the front grip back to the old version when I get more money, but for now it'll do.

I also managed to shoot a T-Shirt about 80m at 70psi, recoil was awesome :D
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Last edited by MrCrowley on Sat Jan 12, 2008 10:47 pm, edited 20 times in total.
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Unread postAuthor: chaos » Tue Jul 03, 2007 2:15 am

Freaking nice, congratulations, great work.
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Unread postAuthor: wannabie » Tue Jul 03, 2007 2:18 am

wow man thats sweet but isnt that ball valve a bit hard to trigger?

oh yeah and Damge Pics !! Damge Pics !! Damge Pics !!
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Unread postAuthor: MrCrowley » Tue Jul 03, 2007 2:22 am

Thanks guys, nah the ball valve used to be behind me so I couldn't hold the gun properly as seen in the video before my pilot valve mod. Now I can shoulder the gun one hand on the body one on the ball valve and you simply flick it back towards you.

Yeah I launched a golfball in my garage, it richocheted of every wall and roof and almost took me out, so later when my parents are out and I have some space ill do some damage. As you can see at the end of the video the golfball went into my neighbours lawn over the fence.
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Unread postAuthor: spud yeti » Tue Jul 03, 2007 2:22 am

Decent cannon there! I really like it! Looks awesome too, well done on the sprayjob. Does the barrel not need a support though?
But well done on creating a beast! :D
btw, nice SG in the name! :D (attractiive...)
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really good quote/phrase here
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Unread postAuthor: hi » Tue Jul 03, 2007 2:27 am

nice paintjob. i would have used a sprinkler valve as the pilot valve, but it is still a very good cannon.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: MrCrowley » Tue Jul 03, 2007 2:29 am

@Spud yeti:
The barrel sin't long enough for a support, its quite sturdy

@hi:
Yeah but it would set me back $50NZD($38US) just to get a modded solenoid valve. I can only get 1" valves for $40NZD shipped, then it cost me $10 to mod it.
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Unread postAuthor: TwitchTheAussie » Tue Jul 03, 2007 2:40 am

Bloody awesome mate. Keep it up
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Raise your horns if you love metal.
spudgunning is like sex, once you've tasted, you can't wait til next time.
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Unread postAuthor: wannabie » Tue Jul 03, 2007 2:41 am

may i ask what your bumper is?
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Unread postAuthor: MrCrowley » Tue Jul 03, 2007 2:46 am

You sure can, you know drum kits... Well at school I found this soft round foam thingy on one of the drum symbols...
I thought it looked closer enough to 50mm(2") to me so I took it home, it fitted perfectly so thats what I use. The piston slams into two of the side bolts. I made those two bolts long and the top and bottom ones short. I would of made them all long but I couldn't find another 2 long bolts.
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Unread postAuthor: wannabie » Tue Jul 03, 2007 3:03 am

OMFG did you steal it? thats bad your not ment to steal. lol

but yeah i know what your talking about
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Unread postAuthor: MrCrowley » Tue Jul 03, 2007 3:07 am

Not steal....Permantly borrow, I know the teacher and she said I could have it anyway, it was on the ground :idea:
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Unread postAuthor: wannabie » Tue Jul 03, 2007 3:44 am

lol i like that term perminently borrow
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Unread postAuthor: Modderxtrordanare » Tue Jul 03, 2007 4:00 am

MrCrowley wrote:Not steal....Permantly borrow, I know the teacher and she said I could have it anyway, it was on the ground :idea:



So you borrow-took some drum equipment materials. Brilliant. :)


I prefer expanding foam or a chunk of hose. But whatever tickles your pickle. :wink:
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Spudding since '05. Proud waster of plumbing and plumbing accessories.

-Wiki
-How-To: Modding a Sprinkler Valve
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Unread postAuthor: spud yeti » Tue Jul 03, 2007 6:21 am

I just watched the video now... its bloody insane! Nice work! :lol:
btw, I call it "borrowing on a non-return basis" :D
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really good quote/phrase here
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