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 58 users online :: 5 registered, 0 hidden and 53 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

BBMG detent alternative

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

Unread postAuthor: Gun Freak » Tue Dec 06, 2011 2:39 pm

Just an idea, what if you put a bolt behind the spring (left side on the diagram) so you can thread it in and out to adjust the spring pressure? Just a thought.
  • 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: jackssmirkingrevenge » Tue Dec 06, 2011 3:18 pm

Put it on hold for now, a bit fiddly in the dimensions I chose. Started on something else in the meantime, trying to see if the Monsoon loader will work at lower pressures, watch this space :)
  • 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: CpTn_lAw » Tue Dec 06, 2011 6:18 pm

What design are you building?
(And yes i'm still lurking around... Not a lot of time though)
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 07, 2011 1:34 am

I started on this but realised that my smallest o-ring for the blocket piston wouldn't fit, so I have to remake it with the barrel mounted off-centre.
  • 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: CpTn_lAw » Wed Dec 07, 2011 5:26 am

As for the design I showed here yesterday, it is really from a nerf gun. I took it off some time ago, and hooked it to a blow gun with very small air reservoir at 300 psi. I made a small video of the operation :
http://www.youtube.com/watch?feature=player_profilepage&v=KhDlZ1gc4tA
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 07, 2011 5:42 am

As I think I had pointed out in an earlier thread, it's similar to what I did here.

I recently made another prototype based on the above, with the benefit of the lathe, but no real luck, it either cycled extremely fast or not at all, though by restricting the outlet with my finger it was popping away quite happily :)

The problem of projectile feeding remains though, you still have to hook this up to some sort of reloading breech.
  • 0

Attachments
CIMG4113.JPG
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: jackssmirkingrevenge » Thu Dec 08, 2011 3:13 pm

Some progress on this, should have it ready for testing tomorrow.
  • 0

Attachments
CIMG0024.JPG
CIMG0022.JPG
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: jackssmirkingrevenge » Fri Dec 09, 2011 3:52 pm

Well it sort of works... testing at 850 psi:



I have a feeling cloud feeding is never going to be reliable enough...

edit: fixed embed code
  • 0

Last edited by jackssmirkingrevenge on Sun Feb 09, 2014 8:05 am, edited 1 time in total.
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: JDP12 » Fri Dec 09, 2011 3:56 pm

JSR I was thinking the same thing about cloud feeding...

what if you used an inline vortex block and had a bolt portrude into the barrel partly, and used some sort of linkage to link it to that spring piston? That way you eliminate the cloud feeding..

I feel like the linkage could be somewhat difficult to implement however..
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Dec 09, 2011 4:48 pm

It might be worth just replicating the airsoft "bullet valve" upping it to HPA:

Image
  • 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: Gun Freak » Fri Dec 09, 2011 5:02 pm

Did better than I expected... The fact that it's a cloud makes it automatically unreliable.
  • 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: jackssmirkingrevenge » Sat Dec 10, 2011 1:53 am

I would be a shame to let go of the detent though.

Hmmm... gas operation?
  • 0

Attachments
heresasillythought.png
heresasillythought.png (7.71 KiB) Viewed 364 times
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: JDP12 » Sat Dec 10, 2011 2:13 am

I mean I guess... except thats basically a blowback design, and I dunno how practically feasible it would be round 800 psi unless that forward piston is HUGE,

plus, still doesn't solve the problem of cloud feeding :wink:
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: Gun Freak » Sat Dec 10, 2011 9:18 am

That just complicates a design you've already proven unreliable.
  • 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: jackssmirkingrevenge » Sat Dec 10, 2011 10:05 am

Gun Freak wrote:That just complicates a design you've already proven unreliable.


True.

I think the "gas blowback" idea has potential though. It needs 1500 psi to work, but then again it needs to recock a substantial hammer magazine as well as cycling the bolt.

I dunno how practically feasible it would be round 800 psi unless that forward piston is HUGE


Just to cycle a barrel sleeve, it really doesn't need so much force.

Say a 4mm OD barrel and a 10mm piston, just 10 psi gives you a full pound pushing on the piston, albeit for a brief moment.

Combined with a pop-off perhaps...
  • 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

PreviousNext

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'