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 63 users online :: 4 registered, 0 hidden and 59 guests


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

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

Semiauto design; piston/hammer valve type

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

Semiauto design; piston/hammer valve type

Unread postAuthor: Antonio » Fri Mar 07, 2008 8:55 am

This design is actually automatic, but as it will cycle too fast then I am ganna add a mirrored tippmann or spyder like trigger and sear. This setup is also very good as not that many parts are moving. I am not sure if someone thought of this before, probably they did. But yeah this gif visualizes it pretty good. With the materials I used on previous projects I am able to make this system''. Btw dont doubt if the airgun will actually cycle; it will. I did calculations on that and know exactly which springs to use etc.

Plz leave feedback or comments.
  • 0

Attachments
auto3.gif
The blue is the air
auto3.gif (18.94 KiB) Viewed 3055 times
auto.gif
a gif with no color
auto.gif (21.37 KiB) Viewed 3055 times
User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Jared Haehnel » Fri Mar 07, 2008 9:09 am

The action looks good to me...It should cycle just fine 8)
  • 0

My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
Reputation: 0

Re: Semiauto design; piston/hammer valve type

Unread postAuthor: jackssmirkingrevenge » Fri Mar 07, 2008 9:10 am

ant wrote:I am not sure if someone thought of this before, probably they did.


It's basically the same idea I proposed here, though I wasn't the first to come up with it.

Image

The one issue I see with your diagram is that the poppet valve seat is far too big in comparison to the barrel diameter and will require a considerable amount of force to open disproportionate to the flow advantage.

I'm making something similar (though popping off instead of hammer actuated) I'll post pics of my progress when I get home :)
  • 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: bigbob12345 » Fri Mar 07, 2008 9:13 am

good idea it should work well but the only problem that comes to mind is power which would suffer with such low volume if it wasnt high pressure.
  • 0

User avatar
bigbob12345
Major General
Major General
 
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Mar 07, 2008 9:22 am

How were you planning on cocking the bolt?
  • 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

Re: Semiauto design; piston/hammer valve type

Unread postAuthor: Antonio » Fri Mar 07, 2008 9:27 am

jackssmirkingrevenge wrote:
ant wrote:I am not sure if someone thought of this before, probably they did.


It's basically the same idea I proposed here, though I wasn't the first to come up with it.

The one issue I see with your diagram is that the poppet valve seat is far too big in comparison to the barrel diameter and will require a considerable amount of force to open disproportionate to the flow advantage.

I'm making something similar (though popping off instead of hammer actuated) I'll post pics of my progress when I get home :)


I was sure I wasnt the first here. Yeah the valve area may be a problem. But I made this simulation using excel and now I can fill in the area of the valve and of the hammer'' and find the optimum spring k costants that I need for it to cycle in a range of 8-1atm of pressure> its pretty cool. Its kinda hard to figure out the dwell time though as it doesnt open once but about 12 times within 0.2 seconds for my type of airguns. Plz make some pics> I am really curious!!

bigbob12345 wrote:good idea it should work well but the only problem that comes to mind is power which would suffer with such low volume if it wasnt high pressure.

Yeah true. Thats what you have to give in. Not sure how much it will decrease the speed of the bb though:S Hopefully not that much that it becomes half the original speed for this type of valve but then manual.

jackssmirkingrevenge wrote:How were you planning on cocking the bolt?

Thats a good one. I am first ganna try to make this setup without trigger or ball feed''. So I will make one where the hammer tube sticks out so that u can pull it/cocking it with ur fingers. As my design now is pretty small scale I dont have too much space for such things, so thats why I thought about making a prototype which cant shoot first.
  • 0

Last edited by Antonio on Fri Mar 07, 2008 9:33 am, edited 2 times in total.
User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Jared Haehnel » Fri Mar 07, 2008 9:29 am

Jack I like that design its very simple, very few moving parts...the work of a genius...
  • 0

My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Antonio » Fri Mar 07, 2008 9:34 am

Jared Haehnel wrote:Funny I had just thought of that too... Jack I like that design its very simple very few moving parts...the work of a genius...


The problem is, making it work in real life lol. But yeah this one should be doable.
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Mar 07, 2008 9:51 am

Jared Haehnel wrote:the work of a genius...


A genius would have only one moving part - the projectile ;)

I had though of a way of using a conceptually similar system but allowing it to cock here but again it's similar to some paintball markers:

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: Antonio » Fri Mar 07, 2008 10:06 am

jackssmirkingrevenge wrote:
Jared Haehnel wrote:the work of a genius...


A genius would have only one moving part - the projectile ;)

I had though of a way of using a conceptually similar system but allowing it to cock here but again it's similar to some paintball markers:


I was thinking of this:
  • 0

Attachments
hammerauto_389.gif
The red dots are hinges. So when the hammer moves back the upper tube that slides in the barrel moves forwards and seals the load port. In that tube there is a hole to port through the air.
hammerauto_389.gif (5.88 KiB) Viewed 3006 times
User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Jared Haehnel » Fri Mar 07, 2008 11:01 am

Ok, so its the work of a pseudo genius, anyway it looks like there are many ways to skin this cat... do you suppose you could modify a junk paint ball gun to fire bb's... you would get around the need for a machinist...maybe
  • 0

My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
Reputation: 0

Unread postAuthor: Hawkeye » Fri Mar 07, 2008 11:23 am

There is a modified paintball gun at Airsoft Innovations(or Innovative Airsoft?) that shoots plastic bb's.
Very touchy weapon and downright dangerous. The guy considered it a failure. Inconsistent etc. He mentioned having it spit out brass somehow as well. I'm surprised Jack didn't come across this.
I'll try to find the link to it.
We also discussed a bb-gun that was made from various store parts and homemade tweaks from the BB machinegun forum. It was based on a paintball valve with an airsoft modified mag to hold bb's.
  • 0


Hawkeye
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 462
Joined: Sun Jan 21, 2007 7:12 pm
Reputation: 0

Unread postAuthor: Antonio » Fri Mar 07, 2008 12:52 pm

Hawkeye wrote:There is a modified paintball gun at Airsoft Innovations(or Innovative Airsoft?) that shoots plastic bb's.
Very touchy weapon and downright dangerous. The guy considered it a failure. Inconsistent etc. He mentioned having it spit out brass somehow as well. I'm surprised Jack didn't come across this.
I'll try to find the link to it.
We also discussed a bb-gun that was made from various store parts and homemade tweaks from the BB machinegun forum. It was based on a paintball valve with an airsoft modified mag to hold bb's.


Sounds really inspiring.. well atleast the last one lol. Would be great if you could find some pics or links to these topics/projects!
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Mar 07, 2008 1:03 pm

Hawkeye wrote:I'm surprised Jack didn't come across this.


I'm not that easily excited :P

Do you mean these?

They also have a barrel conversion that allows it to be chambered for 0.177 BBs

Image

[youtube]http://youtube.com/watch?v=ePEhwXN9ui4[/youtube]

They're available locally, I'm tempted to buy one, but not just yet.
  • 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: Jared Haehnel » Fri Mar 07, 2008 1:19 pm

The movie doesn't quite play but its a sweet looking gun...
  • 0

My current projects....

Currently buying part for...
http://www.spudfiles.com/forums/my-new- ... rt,15.html
Still on the drawing board...
C02 tank hybrid
Screen doors for submarines...
User avatar
Jared Haehnel
Colonel
Colonel
 
Posts: 611
Joined: Tue Feb 19, 2008 4:15 pm
Location: White River Jct, Vermont
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 ©'