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making a mini pneumatic

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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making a mini pneumatic

Unread postAuthor: f.c » Thu Sep 13, 2007 8:13 am

ive started designing a mini pneumatic but theres some trouble ggdt shows errors when i input the info so can someone please tell me if this gun will work well.


1 inch chamber which is 6 inches long.
3/4 (15 mm ?) barrel which is 12 inches long.
and a ball valve.

im planning to use this gun at around 80 psi so will it be powerfulish for its size ?
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 8:39 am

im planning to use this gun at around 80 psi so will it be powerfulish for its size ?


It's tiny, it has an inefficient valve and you're planning relatively low pressure - in short, not really. What kind of power are you expecting?
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Unread postAuthor: f.c » Thu Sep 13, 2007 8:51 am

using it for mock paint ball wars. and shooting m and m's at stuff. how could i improve it. ( instead of changing valves as other valves can be bulky.)

id be happy to increase the barrel and or chamber length.

im also thinking of upping it to 100 psi.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 8:55 am

be happy to increase the barrel and or chamber length.


It's a simple as that, if you want to keep the same valve then your options to increase power are longer barrel, larger chamber and more pressure - increase those parameters to the most you're willing to live with.
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Unread postAuthor: f.c » Thu Sep 13, 2007 8:58 am

ggdt says i can get over 100 fps with the gun. im thinking of incorporating a burst disk also. what valve is a ball valve in ggdt. and what is the best ratio for a pneumatic.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 9:08 am

You can't realistically model a ball valve in GGDT because you cannot predict how fast you're going to open it.

A burst disk would be very beneficial for power though.
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Unread postAuthor: spud yeti » Thu Sep 13, 2007 11:36 am

Yeah, I would definitely use a burst disk valve, or a coaxial piston valve.
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really good quote/phrase here
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Unread postAuthor: Fnord » Thu Sep 13, 2007 11:48 am

Er.. sprinkler valve? It would be easier than all of the above.
If you want to keep the speed below 250fps you might not even need to mod it.

Also, you can't expect to hit anything more than 20ft away when twisting a ball valve.
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Last edited by Fnord on Thu Sep 13, 2007 11:53 am, edited 1 time in total.
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Unread postAuthor: spud yeti » Thu Sep 13, 2007 11:51 am

If you want to keep the speed below 250fps you might not even need to mod it.


Or just keep low pressures and/or low volume chamber. Good idea though
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really good quote/phrase here
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Unread postAuthor: f.c » Thu Sep 13, 2007 3:48 pm

i need to keep the cost of it ultra low also as i plan on mass production.

spring powered ball valve and a burst disk.
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Unread postAuthor: Pyro Ninja » Fri Sep 14, 2007 2:10 am

I say a 25mm sprinkler valve, only $22.60 at bunnings........my 15mm ball valve cost $13.......but yeah go for a sprinkler valve, they are pretty good, and no movement when opening...

But if you still want to make a ballvalve gun...theres one
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this had pretty desent power....(for a ballvalve gun)
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Unread postAuthor: mtronic » Fri Sep 14, 2007 2:18 am

and shooting m and m's at stuff.

NOOOOOOOOO oh the humanity....poor little m&ms lol

Good luck with the cannon, as others have said maybe a sprinkler valve would be best because your gonna need to be able to shoot with accuracy if you are going to pb with it. Ball valves are hell inaccurate :( I used to use one, but won't ever go back to using them.

Its up to you though.
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Unread postAuthor: Novacastrian » Fri Sep 14, 2007 2:26 am

I have never used a ball valve as a trigger, nor will i.
They suck dogs balls :lol:

Edit: That sounded a bit harsh, oh well.
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Unread postAuthor: Hubb » Fri Sep 14, 2007 4:17 am

and shooting m and m's at stuff.


Yeah, I can just picture the little red guy flying through the air and smacking his pretty little face against a wooden fence or something.
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Unread postAuthor: f.c » Fri Sep 14, 2007 7:34 am

ive modified the ball valve so it turns so easily it is not funny. im using 1 meter of 25mm pipe for chamber and 1 meter of 15 mm for barrel. is this ratio ok ?
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