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First try at a pneumatic gun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: jonnyboy » Sat Feb 14, 2009 6:37 pm

I like the breach loader. You might want another screw there.
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Unread postAuthor: psycix » Sun Feb 15, 2009 11:36 am

Shouldn't the breach load hole be bigger? That means: the whole diameter.
Very nice so far.
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Hole size

Unread postAuthor: jimschouster » Mon Feb 16, 2009 9:49 am

it is bigger then the golf ball tryed to load it and had no problems
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Unread postAuthor: psycix » Mon Feb 16, 2009 12:04 pm

But how well does a golfball fit in your barrel?
How many mm is there (on both sides) between the barrel wall and the golfball if you put it in the muzzle?
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Unread postAuthor: jimschouster » Tue Feb 17, 2009 2:13 pm

If you look at the green part in the pic (Link Below) The Golf Ball is 42.4MM and my sleeve adaptor is 42.9MM. The hole i use is 44.6MM seams ok. I just push it in with my finger. Used balls work well because they are distorted a little making the a tight fit. If you have any question or would like a scale drawing let me know.

http://i569.photobucket.com/albums/ss13 ... Slide1.jpg
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Unread postAuthor: jimschouster » Fri Feb 20, 2009 4:52 pm

Well Gun is DONE!! Will test it some time later this week, hope it works. Johnyboy was right I need another screw on loader, picked up gun and sleeve slid and pinched my finger, opps. For people who may build one out of SCH80 this thing weights 25LBS. But I am planing on 125-130psi. If any one has a good ideal on and semi automatic I have parts for one more gun but could make changes. This gun will be given to my friend who milled all my parts. Thanks for all the suggestion, Jim

http://i569.photobucket.com/albums/ss13 ... 0_1258.jpg
http://i569.photobucket.com/albums/ss13 ... 0_1259.jpg

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http://i569.photobucket.com/albums/ss13 ... 0_1264.jpg
http://i569.photobucket.com/albums/ss13 ... 0_1266.jpg
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Unread postAuthor: ckman » Fri Feb 20, 2009 5:12 pm

Very nice I really love it. Hows the power?
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Unread postAuthor: psycix » Fri Feb 20, 2009 5:24 pm

Nicely done!
GL on testing. (CK he didnt test it yet so he does not know the power of it, though you could make a rough estimate for a well made gun of this size)

Looking at your pictures, your golfball does not fit perfectly, there is a few mm between the ball and the pipe wall.
Your barrel is SCH80 2" right? That does not fit golfballs perfectly unless you fit SDR21 pipe in.
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Unread postAuthor: jimschouster » Sat Feb 21, 2009 8:14 am

were can I get that? McMaster-Carr? How tight does it need to be?
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Unread postAuthor: daxspudder » Sat Feb 21, 2009 11:24 am

...just thought Id let you know that barrel is spell like that<<< not to be a dick...
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Unread postAuthor: LCTChamp » Sat Feb 21, 2009 2:28 pm

daxspudder wrote:...just thought Id let you know that barrel is spell like that<<< not to be a dick...


I just thought I'd let you know that you add -ed to a verb if it is past tense (spell - spelled). Don't correct people if you need corrected yourself.

On another note...the gun looks great! As mentioned above, to shoot golf balls you will either need sdr 21 or use a wad/sabot.
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Unread postAuthor: psycix » Sat Feb 21, 2009 3:56 pm

jimschouster wrote:were can I get that? McMaster-Carr? How tight does it need to be?

It needs to be as tight as possible.
Airtight fit is the best, but as this is not always possible, you should really fit it as close as possible. One or maybe two mm difference in diameter isnt that horrible, but it does decrease performance.
You could also use wadding or a sabot to make up for the difference.
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Unread postAuthor: jimschouster » Sat Feb 28, 2009 8:44 am

My first gun worked! Thanks for all your help! Psycix was right had to make it tighter :)

http://s569.photobucket.com/albums/ss13 ... 0_1283.flv
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Unread postAuthor: psycix » Mon Mar 02, 2009 1:16 pm

Congratulations with your first gun! :D
Thats why I'm here, to help people!
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