mini pneumatic

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SpudFiles Forum Index » Mini Discussion » mini pneumatic

mini pneumatic

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knappengineering

Posted: 09/18/2007 22:42 PM Post subject: mini pneumatic

Staff Sergeant

Joined: 24 Jun 2007
Posts: 126
1.74 Spud Bux

I'm looking to make a mini pneumatic that is capable of more that one shot before re-pumping. I was thinking of using a small regulator like this http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=90590
to regulate it down to a second firing chamber but i'm looking to make it as small as possible! any ideas? btw, i was thinking of using a 1/2"pvc barrel but i'm not sure about the valve, i'm thinking anything small and easy to make. thx.

Lentamentalisk

Posted: 09/18/2007 22:58 PM Post subject:

Resident Tinkerer
Colonel

Joined: 07 Aug 2007
Posts: 614
209.68 Spud Bux

well there is always that idea that i posted to you a few days ago, but what ever, incase you lost it, here it is
http://www.spudfiles.com/forums/firing-more-than-once-before-re-pumpin g-t10475,start,15.html

why dont you just use a ball valve to empty from a larger tank at the same psi?

knappengineering

Posted: 09/18/2007 23:01 PM Post subject:

Staff Sergeant

Joined: 24 Jun 2007
Posts: 126
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i made a larger gun with the ball valve design ur suggesting but i haven't tried it yet because the glue is still curing but i want to make this one super small. i thought i might use a blowgun for a valve. just not sure about the chamber design cuz now that would be the only large part.

f.c

Posted: 09/18/2007 23:12 PM Post subject:

Captain

Joined: 08 Jul 2007
Posts: 341
94.45 Spud Bux

go ahead but the largest thing you could fire from it would be 6mm bb's. though at 100 psi with a 6mm barell (50cm long) i could imagine it doing some decent damage.

knappengineering

Posted: 09/18/2007 23:18 PM Post subject:

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Joined: 24 Jun 2007
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i was thinking of using adapters to get up to a half inch barrel. I might use a 1 inch high pressure chamber thats regulated down to a 3/4" low pressure firing chamber. would that work for firing foam pellets and frozen mini marshmallows?

jimmy101

Posted: 09/19/2007 12:11 PM Post subject:

Major General

Joined: 28 Mar 2007
Posts: 1415
5996.50 Spud Bux

Couple thoughts;

1. Large chamber at moderate pressure, perhaps 150 PSI.
2. Small chamber, also at 150 PSI.
3. The large and small chambers are connected by a very small ID hose, perhaps less than 1/16"ID.
4. Small chamber connected to an electrically activated valve, like a sprinkler or dishwater valve.
5. Valve connected to breech mechanism and barrel.
6. When you fire, the small chamber depressurizes and propels the ammo. The small bore hole between the two chambers restricts gass flow enough that little of the big chamber's air is used.
7. When the firing valve is closed the big chamber repressurizes the small chamber in a few seconds.

Another method would be to just use a poppet valve (IIRC what a paintball gun uses). The valve is opened by striking it and it auto-closes very quickly.

You might want to take a look at the RC Warship gun designs;
Hind Guns

knappengineering

Posted: 09/19/2007 23:49 PM Post subject:

Staff Sergeant

Joined: 24 Jun 2007
Posts: 126
1.74 Spud Bux

thx, i'll check it out

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