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 48 users online :: 4 registered, 0 hidden and 44 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Airsoft Detent BBMG

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
Sponsored 
  • Author
    Message

Airsoft Detent BBMG

Unread postAuthor: Gun Freak » Sun Oct 17, 2010 5:53 pm

First, this is in the discussion because it isn't complete. When it is all finished I'll post it in the showcase. Trust me, it will look cool.
Anyway, here are the specs.
Chamber: 11" of 3/4" pvc.
Barrel: 3' 6.35mm aluminum
Detent: 2 o-rings max, although most of the time I will probably only use one because it is really tight. I don't even know if the bb will be able to make it through. :? We'll see tomorrow after the JB is fully cured.
Valve: 1/4" ball valve on my FE tank for testing. May add a new valve in final version.
Running pressure: Will depend on pop pressure of detent, but anywhere up to 180 psi.
QD in rear of chamber for connection to air supply.
Pictures:
Tank
Image
With barrel
Image
With tank
Image
Barrel assy
Image
Detent seat
Image
With o-ring
Image
BB with detents.
Image
Sorry about blurry close ups, macro wasn't cooperating :P You should get the idea though.

Suggestions are appreciated, this is a WIP.
:occasion5:
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: clemsonguy1125 » Sun Oct 17, 2010 6:06 pm

Im afraid the bbs wont make it through, Polandspud had a detent about that size and it took 300psi. You could cut a groove in the pipe and jb weld the oring like that or even better wrap tape over it and you can replace it. Other than that, it looks good.
  • 0

User avatar
clemsonguy1125
Major General
Major General
 
Posts: 1485
Joined: Tue Jul 21, 2009 4:00 pm
Location: East Coast
Reputation: 1

Unread postAuthor: Gun Freak » Sun Oct 17, 2010 6:18 pm

If the o-rings don't work I can just switch to tubing which was my original plan, but I couldn't find the right size so I used an o-ring. My plan C however for this would be take off the brass tubing, drill out the back and put the o-ring behind the bushing, hard to explain but it might work. Or I could drill out the o-ring a bit, we'll see how testing goes tomorrow. It was easy to push the bb through the o-ring when it wasn't in the pipe and had room to strech, but the brass pipe is limiting how much it can strech so it is going to tank a lot of force to get it out.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: jhalek90 » Sun Oct 17, 2010 7:58 pm

i can tell you right now that 180 psi will not push the bb through.

I had to use an oring the the bb ALOMST fell through before it popped at 100 psi... my set up was very similar.
  • 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 » Sun Oct 17, 2010 8:48 pm

You could calculate this before just going gung-ho into testing.

All you would need to do is figure out how much force is needed to push the BB through your seal. Then, to find the psi it will take to push it through you just do pressure * ~1/2" the surface area of the BB (assuming only half of the BB's surface area is embedded into the seal)
  • 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: c11man » Sun Oct 17, 2010 9:07 pm

[quote="Lockednloaded"
All you would need to do is figure out how much force is needed to push the BB through your seal. Then, to find the psi it will take to push it through you just do pressure * ~1/2" the surface area of the BB (assuming only half of the BB's surface area is embedded into the seal)[/quote]

you would calculate it with the cross secton area of the bb. the only time you would have less area is when the bb is right in the middle of the oring and after(after doesnt matter becuase its already throught). when its in the middle the oring might deform around the edges of the bb but it would affect the area very little.
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Oct 17, 2010 11:21 pm

Looking good, it will take some trial and error but the benefits of a detent will make it worthwhile :)
  • 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: lozz08 » Sun Oct 17, 2010 11:53 pm

JSR is right. Like me, you'll probably accidentally come across some fitting that does exactly what you want. That o-ring certainly won't.
  • 0

User avatar
lozz08
2nd Lieutenant
2nd Lieutenant
 
Posts: 239
Joined: Wed Jul 01, 2009 7:33 am
Reputation: 0

Unread postAuthor: Gun Freak » Mon Oct 18, 2010 5:52 pm

Well testing today confirmed my nightmares :lol:
The bb held strong in the breech up to 160 psi. My pump is not cooperating :roll: I'm either going to get a new head for it or send it back. I could have used the money on a HS camera. Anyways, I tried all these different things, don't feel like saying them all lol. I can push the bb through with my fingers but it is really hard. Pushing it almost half way through gets it far enough to where to pressure can force it out, but only for one shot before I have to do it again. I don't really know what to do now, besides maybe trying rubber tubing, so I need some more suggestions. If all else fails, I'll use POLAND SPUD's adjustable detent. I think my current setup will allow it.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: c11man » Mon Oct 18, 2010 6:03 pm

use a very small file and take out some of the rubber on the inside of the oring, using trial and error take out more and more rubber untill it pops at the right pressure
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: Gun Freak » Mon Oct 18, 2010 6:10 pm

That's what I was thinking about doing. I'm gonna go try it not, but I don't have any files so I'll try like a drill bit or something.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: lozz08 » Mon Oct 18, 2010 7:26 pm

If you take a look at my mag fed 6mm thread, you'll see that I used a compression fitting designed to clamp over compressor line to go into a blowgun. If I were you, I'd go purchase this:

http://cgi.ebay.com.au/BRAND-NEW-High-P ... 588a5e8f17

It comes with the compression fitting that I used and its inside diameter when not screwed in is exactly 6mm. When you screw it into a 1/4 inch nipple, the washer is squashed. You can set the popoff pressure to whatever you like. And the pressure washer handle is really good quality. They sell heaps of them, get one in a buy it now auction.
  • 0

User avatar
lozz08
2nd Lieutenant
2nd Lieutenant
 
Posts: 239
Joined: Wed Jul 01, 2009 7:33 am
Reputation: 0

Unread postAuthor: Gun Freak » Mon Oct 18, 2010 8:07 pm

That's Australian, and it is a lot of money. If the method I am using proves to be dysfunctional, I will switch to the threaded fitting washer sandwich method thingamabober. :D Thanks for the suggestion though Lozz.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: Gun Freak » Wed Oct 20, 2010 7:23 pm

New videos, got it working. Power is good. It gets through 5 layers of cardboard and my 300 fps pistol can't even get through one. That is pretty strong. Thing is, ROF is still high, and that is what I wanted to lower. I'm gonna mod my other o-ring and see what I can do.
[youtube]http://www.youtube.com/watch?v=YoWcnwK4mKM[/youtube]
[youtube]http://www.youtube.com/watch?v=oZqOtD__aTo[/youtube]
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: lozz08 » Wed Oct 20, 2010 8:23 pm

Sir, you will never lower the rate of fire of a bbmg vortex to a reasonable level. The fact is that the only way to lower ROF is to lower the flow of gas coming from the blowgun. But vortex blocks need high flow to agitate bbs.

That is the whole point of what I did with my 6mm mag fed full auto. I suggest you check it out because it allows for a lot of adjustability of rof and power. I have nearly finished the outside of the gun and when I post it in the showcase It will give you a good idea of what a detent type system can do in airsoft.
  • 0

User avatar
lozz08
2nd Lieutenant
2nd Lieutenant
 
Posts: 239
Joined: Wed Jul 01, 2009 7:33 am
Reputation: 0

Next

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'