Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 59 users online :: 5 registered, 0 hidden and 54 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

wip KRISS smg.

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.
Sponsored 
  • Author
    Message

wip KRISS smg.

Unread postAuthor: jhalek90 » Sun Sep 18, 2011 10:19 am

Just thought i would show you all my latest project.
Still a very early wip.
the design is based on the KRISS smg.

planned caliber is 6mm for airsoft.
Image

The body was just roughed out, and is made from a black ABS plastic, about 1'' thick. overall the weight is about 8lbs so far.
I do have covers, for each side of the giant hole that houses the breech/QEV.

for comparison, a real KRISS
Image

A few obvious differences, the large mag well was shrunk, as i felt it looks less blocky, the stock is collapse-able, not fold-able. and the foregrip is one solid piece with the body.

The trigger mec is still a WIP, but should allow for full auto.
The trigger, with a stiff spring, and a pivoting arm will sit behind the pop off valve, and block it from opening. Once the trigger is pressed, the arm will move, allowing the pop off to open, for full auto. semi auto will be accomplished with a "tap" of the trigger.

Any comments, or ideas are welcome.
  • 0

Last edited by jhalek90 on Sun Sep 18, 2011 2:38 pm, edited 1 time in total.
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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Sep 18, 2011 10:39 am

Interesting, what are you doing for a chamber? Remote line to a paintball bottle or similar?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: jhalek90 » Sun Sep 18, 2011 2:33 pm

the chamber is inside the mag well... or where the KRISS has its special recoil system.

I will upload a firing video in when i get a chance. The trigger mec is functional now 8)

Image
rubber band was for testing, there is space inside for a spring.
  • 0

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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 12:28 am

jhalek90 wrote:the chamber is inside the mag well... or where the KRISS has its special recoil system.


Ah... doesn't look like it will last for too many shots, even at high pressure. The QEV is a little overkill in this case in my opinion, a 1/8" one would probably have given you sufficient power and conserved air.

I will upload a firing video in when i get a chance. The trigger mec is functional now 8)


Let's see it :)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: jhalek90 » Mon Sep 19, 2011 9:18 am

Here is another photo with a cloud chamber attached.
The Pop of valve pulses the air, and further agitates the BB's. Ive found i get 2-3 BB's per pulse pretty reliably.

This is currently 6mm, and hold about 50 bbs, but i do have a .177 barrel for it as well.

Image

I was taking a video with my iphone, and it fell onto the basement floor (concrete) amazingly, everything still works, except the audio in videos....

im sure you dont want to watch a BBMG with no audio... lol i will try and take a video with my wife's phone this afternoon. The sound is the legendary "daka daka daka" with about 2-3 bbs per shot.

jackssmirkingrevenge wrote:Ah... doesn't look like it will last for too many shots, even at high pressure.


I think i was misleading, this runs off of my compressor. The chamber is emptied every shot. The chamber is a 1/4''x6'' pipe nipple.

There is also a needle valve, built into the stock, at the bottom of the chamber near the quick disconnect, to control the rate of the pop off.
  • 0

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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: POLAND_SPUD » Mon Sep 19, 2011 9:56 am

hmm interesting project...

I guess I am not the only person who wants to know this... why not a detent ??

or better yet... have you considered using an airsoft hopup unit ?


my wife's phone this afternoon
You've got a wife ??

damn you were so young... so full of life :roll:
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 10:22 am

First of all, wow! The chassis is looking really good! The downside is it does make the stock look at bit ghetto by comparison.

jhalek90 wrote:Here is another photo with a cloud chamber attached.
The Pop of valve pulses the air, and further agitates the BB's. Ive found i get 2-3 BB's per pulse pretty reliably.


Was going to suggest a detent but I see it's been recommended already. I would go with a mechanical one as opposed to an o-ring, you have a fast valve so pressure buildup is much less of an issue.

I think i was misleading, this runs off of my compressor. The chamber is emptied every shot. The chamber is a 1/4''x6'' pipe nipple


OK, makes sense now.

You've got a wife ??

damn you were so young... so full of life


At least he still seems to have the time and money to play with his toys, for now ;)

Link to what sort of ABS the chassis material is exactly?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Sponsored

Sponsor
 


Unread postAuthor: jhalek90 » Mon Sep 19, 2011 11:02 am

The abs plastic is actually leftover shelving from a grocery store where I work. Can u say free?

I had a detent on the barrel, consisting of a .177 cal bb protruding into the barrel, and in place by some latex tubing over the barrel.
For some reason this seems to smash the crap out of the bbs, and they come out as shrapnel. I'm currently re working the detent.

As for the wife, we celebrated our first anniversary in July.

@jack: the stock is removable/ collapsable and no where near done. :)
  • 0

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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: warhead052 » Mon Sep 19, 2011 11:09 am

Jhalek, that is nice. It actually kind of looks like the kriss, amazingly close. Nice job on the detail work, does it split open? Might I suggest a red dot sight?
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Sep 19, 2011 11:16 am

jhalek90 wrote:The abs plastic is actually leftover shelving from a grocery store where I work. Can u say free?


Ah.

I'm liking the L4YER CAKƐ construction, I know I've seen it before in wood but for this it looks great!

I had a detent on the barrel, consisting of a .177 cal bb protruding into the barrel, and in place by some latex tubing over the barrel.
For some reason this seems to smash the crap out of the bbs, and they come out as shrapnel. I'm currently re working the detent.


Same old problem of the airtight detent of the airflow being blocked off before the BB can leave the barrel.

That's why I would go for a sprung ball.

the stock is removable/ collapsable and no where near done.


Good to hear :)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: wyz2285 » Mon Sep 19, 2011 1:22 pm

clever trigger! this gun looks really nice, but if it shoots 2-3 bbs every time, is it accurate?
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Unread postAuthor: Lockednloaded » Mon Sep 19, 2011 7:15 pm

I've been messing with a similar cloud type feeding mechanism, but I'm have some trouble with inconsistency while using a QEV and DCV. My chamber was 1/2" what size is yours? And can you fire it aiming any direction?
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Unread postAuthor: jhalek90 » Mon Sep 19, 2011 7:39 pm

Lockednloaded wrote: My chamber was 1/2" what size is yours?

My chamber is a 1/4'' x 6'' pipe nipple.

Lockednloaded wrote:can you fire it aiming any direction?

Yes.
what psi are you using?

wyz2285 wrote:clever trigger! this gun looks really nice, but if it shoots 2-3 bbs every time, is it accurate?

heck no. Its a BBmg lol. the accuracy is actually decent when i use a 12'' barrel. the barrel in the photo is only about 5''... and accuracy is about what you would expect.


jackssmirkingrevenge wrote:I'm liking the L4YER CAKƐ construction, I know I've seen it before in wood but for this it looks great!

Thanks. I also like how its starting to look.
Its only 2 layers btw.


jackssmirkingrevenge wrote:Same old problem of the airtight detent of the airflow being blocked off before the BB can leave the barrel.
That's why I would go for a sprung ball.


The detent functions like a non adjustable spring/ball, as the latex tubing is slid over the outside of the barrel, it serves as a spring pushing the ball into the barrel.

I think my issue, and part of the reason i get such good feeding, is the super tight bore barrel. i cant see any light when i put a bb in it, and point it right at a light bulb. its VERY close to 6mm. probably like 6.01mm
  • 0

Last edited by jhalek90 on Mon Sep 19, 2011 7:47 pm, edited 1 time in total.
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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: jhalek90 » Mon Sep 19, 2011 7:46 pm

DOH! doubble post.... sorry :oops:
  • 0

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.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: Lockednloaded » Mon Sep 19, 2011 7:57 pm

Sorry, I meant cloud chamber, mine feeds horribly, I'm trying to use 850psi.
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'