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 45 users online :: 4 registered, 0 hidden and 41 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

HPA airsoft BBMG w/detent seal

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.
Sponsored 
  • Author
    Message

Unread postAuthor: jackssmirkingrevenge » Thu Jul 29, 2010 4:42 pm

As soon as I can define what I want to achieve, I will ;P
  • 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: lozz08 » Thu Aug 05, 2010 8:31 pm

Hey Jack, excuse my ignorance but, what does the bolt actually do? Like the rubber seals it, but the bolt?
  • 0

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

Unread postAuthor: Gun Freak » Thu Aug 05, 2010 8:47 pm

I think the bolt makes it adjustable.
  • 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 » Thu Aug 05, 2010 11:50 pm

The original idea for this was as a single shot launcher where the chamber would be pressurised with the BB held in the seal by the bolt, and you'd unscrew the bolt to fire. In this context being used as a BBMG, the bolt doesn't really do anything, it's the seal that provides the "detent" element.
  • 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: lozz08 » Fri Aug 06, 2010 12:47 am

currently I'm working on a design very similar to this but with a tee magazine and silicon glue as a seal. I need to incorporate a hopup somehow...
  • 0

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

Unread postAuthor: jackssmirkingrevenge » Fri Aug 06, 2010 12:58 am

This incorporated with the seal will give you adjustable release pressure and if placed at the top of the barrel, hopup ;)
  • 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: lozz08 » Fri Aug 06, 2010 11:26 am

having you around has probably saved me a couple of years of fiddling around. It's good because we should advances as a spud civilisation and not repeat the mistakes of the previous spud generation :lol:
  • 0

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

Sponsored

Sponsor
 


Unread postAuthor: lozz08 » Fri Aug 06, 2010 11:43 am

what about a screw that pushed directly onto the top of the rubber tube? that would cause the seal to push harder on the top of the bb, and give it backspin, while eliminating potential worries with sealing the bolt because everything is still isolated from the barrel.
  • 0

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

Unread postAuthor: jackssmirkingrevenge » Fri Aug 06, 2010 2:26 pm

lozz08 wrote:having you around has probably saved me a couple of years of fiddling around. It's good because we should advances as a spud civilisation and not repeat the mistakes of the previous spud generation :lol:


Faith No More said it best, someone's got to do it ;)

what about a screw that pushed directly onto the top of the rubber tube? that would cause the seal to push harder on the top of the bb, and give it backspin, while eliminating potential worries with sealing the bolt because everything is still isolated from the barrel.


What would concern me is the seal getting unevenly squashed, but technically it should work and I believe was also suggested elsewhere, as well as Jimmy's idea to use air pressure outside a flexible seal as a "detent", it's in the adjustable ROF thread. You'd need to ensure the seal can accessed for maintenance though.
  • 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: POLAND_SPUD » Fri Aug 06, 2010 2:34 pm

adjustable ROF
It an be achieved with a rubber washer/o-ring sandwiched between two fittings
  • 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 » Fri Aug 06, 2010 2:39 pm

POLAND_SPUD wrote:It an be achieved with a rubber washer/o-ring sandwiched between two fittings


As you had done here, but he wants hop-up as well.
  • 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: irisher » Fri Aug 06, 2010 2:50 pm

I did the the screw method on my HPA bbmg. It worked well and it was easily adjustable.
  • 0

User avatar
irisher
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 420
Joined: Mon Dec 29, 2008 2:53 am
Reputation: 0

Unread postAuthor: POLAND_SPUD » Fri Aug 06, 2010 4:52 pm

but he wants hop-up as well
yeah but I think it wouldn't be that difficult to build a hop-up using the same method... the added advantage is taht you can adjust rof and hop-up independently...

lol I narrowly avoided another posting fail :D

I've used such home-made compression fittings in quite a lot of applications and it works surprisingly well... it's both on the fridge compressor and it holds the barrel in place on the semiauto MKIII

This is a very useful method of joining metal parts/tubes & fittings that can be undone quickly with a pipe wrench but holds well (both in terms of pressure and mechanically)
  • 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: lozz08 » Sat Aug 07, 2010 10:25 am

my problem is I'm using a 1/4 inch tee already where the bottom of the tee is an o-ring seal for a removable spring fed mag (I'm going for a realistic kind of gun here) The barrel screws in to one side of the tee, the other side is the air inlet. I need to incorporate the seal into the screw-in barrel.
  • 0

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

Unread postAuthor: POLAND_SPUD » Sat Aug 07, 2010 11:49 am

I sandwiched the rubber washer between two 1/2" male-to-female adapter (or whatever you call this part)
Image
So it's not that you need another T
  • 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

PreviousNext

Return to BB/Airsoft/Pellet Gun Database

Who is online

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

Reputation System ©'