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*video* KRISS bbmg pulsed cloud design.

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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*video* KRISS bbmg pulsed cloud design.

Unread postAuthor: jhalek90 » Thu Sep 22, 2011 12:20 pm

This is my latest project, the body is based (loosely) off of the KRISS smg.

SPECS:

Firing pressure: 75 psi via pop off valve.
Firing valve: 1/4'' QEV.
Chamber: Co2 tank, used as air tank.

This gun use a QEV modded for full auto, with a 75psi pop off valve, to pulse air from an old co2 tank, into a small could chamber.

Each pulse fires aprox 12-20 bbs, the chamber will hold about 150.

Video:
[youtube]http://www.youtube.com/watch?v=QSSsHuD1wgg[/youtube]

The shell of the gun was made from 2 sheets of 1/2'' thick abs plastic that i got from work. The shell is not yet compete, but i thought i would see if anyone had any ideas for improvement on the overall design.
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POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jrrdw » Thu Sep 22, 2011 2:54 pm

Do you get any jamming problems with a full load of BB's? Looks like it's got a fair amount of pep to it.
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Unread postAuthor: wyz2285 » Thu Sep 22, 2011 3:23 pm

sounds great :D , but if it fires 12 bbs every time, how is the accuracy?
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Unread postAuthor: clemsonguy1125 » Thu Sep 22, 2011 3:53 pm

Looks cool, how did you cut the plastic?
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Unread postAuthor: jhalek90 » Thu Sep 22, 2011 7:50 pm

jrrdw wrote:Do you get any jamming problems with a full load of BB's?.

Sometimes, but not very often. and when it does jam, a little shake fixes it.

wyz2285 wrote:sounds great :D , but if it fires 12 bbs every time, how is the accuracy?

Its about as good as any other BBMG with a 4'' barrel. :-)
i can hit a pop can from 25 feet

clemsonguy1125 wrote:Looks cool, how did you cut the plastic?

With a jig saw, a drill, and a dremel.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 23, 2011 1:15 am

Interesting. Quite a short barrel you got there, pressure needs to be upped :D

Shame about the multiple BBS per pulse though.

Have you seen the Umarex Steel Storm magazine?

Image

It combines a BB chamber with a spring loaded magazine, so you get high capacity which requires no mag changes or extra BB pouring.

We had discussed this concept a long time ago on Spudtech (large BB chamber feeding a smaller firing chamber to reduce losses due to dead space.) but nothing came out of it.
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Unread postAuthor: jhalek90 » Fri Sep 23, 2011 1:17 am

Jack, I would love some more info on how that magazine works.
Possibly a diagram?
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 23, 2011 1:44 am

jhalek90 wrote:Possibly a diagram?


This is basically how I understand it:
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Unread postAuthor: jhalek90 » Fri Sep 23, 2011 7:49 am

okay, i assume the air enters the bottom tube at someplace behind the bb's...
would that be correct?
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 23, 2011 7:54 am

jhalek90 wrote:okay, i assume the air enters the bottom tube at someplace behind the bb's...
would that be correct?


That is just the magazine feed, I assume it has some sort of ratcheted hammer mechanism to release the air. Still waiting for someone *cough* to find the time to dismantle his ;)
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Unread postAuthor: jhalek90 » Sat Sep 24, 2011 3:36 am

Ahh, I see now. I was confused.

So it's like a hopper, feeding into a magazine.
Seems like a decent idea to me.

I might build a pistol with that concept...

Edit: as for a use in this design, you were talking about a large"hopper" feeding into the bb chamber, possibly via a ballvale or something similar...If I understand correctly.

Sounds like a good idea, I could replace one of the pipe nipples on the chamber with a "t" fitting that goes to a hopper/ball valve.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 26, 2011 12:20 am

You could potentially use a large three way ball valve, and the inside of the ball valve could be the "firing chamber".


_______[BB hopper]
____________::
[barrel]---[ball valve]---[air source]
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