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 42 users online :: 3 registered, 0 hidden and 39 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

mini hammer valve

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: inonickname » Fri Mar 20, 2009 10:20 pm

It'll be interesting to see what you get out of the schrader..Keep in mind that more pressure will increase the cracking pressure, but increase the amount of blowback and power you get..so some experimenting should find you a "sweet spot".

Good luck
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Mar 21, 2009 9:46 am

Well here it is, farting away :D

[youtube]http://www.youtube.com/watch?v=d4Ygi-5gtyU&feature=channel[/youtube]

This is attached to my track pump using on the air in the pump as the "chamber", going from 160 psi to 0 psi...

[youtube]http://www.youtube.com/watch?v=29w5zyC8Hck&feature=channel[/youtube]

... while this is at 110 psi hooked up to my compressor.

Methinks a heavier bolt is in order to bring that rate of fire down.
  • 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: inonickname » Sat Mar 21, 2009 10:11 am

Baha! That sounds so pathetic...

You might want to mod the schrader a bit, after the energy used to recock the bolt there wont be much left for propelling the projectile.

Good job on getting it to cycle so fast..lets see if it shoots!
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: MRR » Sat Mar 21, 2009 10:20 am

Attach some wings and you will have a hummingbird :lol: .

Or you replace the bolt with a needle and tattoo yourself.
:headbang:

Otherwise great work.
  • 0


MRR
Major
Major
 
Posts: 362
Joined: Tue Feb 17, 2009 2:29 pm
Reputation: 0

Unread postAuthor: POLAND_SPUD » Sat Mar 21, 2009 10:30 am

now I know why you always talk about flatulence and stuff :wink:

I can't wait to see it shooting though
  • 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 » Sat Mar 21, 2009 10:39 am

Good job on getting it to cycle so fast..lets see if it shoots!


No question of shooting anything for now.

Note that this is all done at relatively low pressure, at higher pressures power should go up and rate of fire should go down. The high cycling rate is definitely not a good thing, but with more pressure the hammer should be thrown back more and therefore it will shoot slower.

Currently making an adapter to hook it up to a 12 gram, let's see how that goes :)
  • 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: Sticky_Tape » Sat Mar 21, 2009 10:55 am

I made somthing long ago that used a shrader and had that same effect the bolt was 1/2'' in diameter. I forgot to mention this in my previous post, My bad. I would run it at 160 psi and off of a I think 325ml tank I got about 30 seconds of buuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuur :) Are you going to use this like btb's machinegun? Glad to see it works, sorry I have no pictures.
  • 0

You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
User avatar
Sticky_Tape
Brigadier General
Brigadier General
 
Posts: 1175
Joined: Thu Jan 31, 2008 6:35 pm
Location: Sydney, Nova Scotia, Canada.
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Gippeto » Sat Mar 21, 2009 10:58 am

Have you given any thought to increasing the hammer mass? It'll increase dwell time (improves power) and reduce the cyclic rate.

But, you knew that already, didn't you? :)
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: inonickname » Sat Mar 21, 2009 11:02 am

Erm, Gippeto:

jackssmirkingrevenge wrote:Methinks a heavier bolt is in order to bring that rate of fire down.


By the way, by cycling fast I meant good job on getting it working quickly, not the actual speed that it cycled at.. Keep in mind you should expect fast cycles as your basically replacing the crank on a co2 motor with a spring and exhausting it early..

It'll be interesting to see what you can get this into.
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Mar 21, 2009 11:05 am

I mentioned a heavier bolt in the video post ;p already did it by the way, added several grams of lead and it made a significant difference. I'm hoping though that higher pressure will make the real difference in reducing cycling rate. I can already tell from testing at 160 psi that as the "chamber" pressure goes down, the rate of fire increases.

In the meantime, I've been experimenting with single shots using 3mm BBs at 400 psi in the pen gun v2, very impressive, will go clean through a soup tin easily.

Here's the adapter I made for the hammer valve (using the back end of the original pen gun), tomorrow I'll hook it up first to a 400 psi air chamber and if that goes well, I'll try a 12 gram using a CO<sub>2</sub> tyre filler.
  • 0

Attachments
hammervalveschraderadapter.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: Gippeto » Sat Mar 21, 2009 11:16 am

My bad. :oops:

Note to self;

Always.. :banghead: read.. :banghead: the.. :banghead: whole.. :banghead: thread. :banghead:
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: psycix » Sat Mar 21, 2009 2:10 pm

The farting machine works! Cool, this thing r0xx0rz mai b0xx0rz n mai s0xx0rz!
Do you think there is any "air power" left besides having it cycle?

Keep adding more and more weight, and make a vid of that too :)
In the end, daka-daka-daka is more useful then braaaaap!

Be careful with the 12 gram and the 400 psi. It would be crap to blow the thing up. Do you figure that it will hold it? Or will you simply assume it?

I'm not using it to launch tennis balls.

You.. aren't...? :(
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Mar 21, 2009 2:29 pm

Be careful with the 12 gram and the 400 psi. It would be crap to blow the thing up. Do you figure that it will hold it? Or will you simply assume it?


If you're hoping for a repeat of the epic marker gun fail I fear you'll be disappointed :P this is exactly the same construction technique and materials as my pen guns so no worries - other than the bolt head slamming into the valve repeatedly and destroying it, but I've added an airsoft BB as a bolt head to give a gentler impact.

Do you think there is any "air power" left besides having it cycle?


There's quite a breeze coming out of the exit port at 100 psi, I'm guessing it will be good enough at 400 psi+ I'm also considering a floating o-ring on the bolt as you can feel the air blow past it and it seems a shame to have it wasted.

You.. aren't...?


Balls no bigger than 3mm, I'm not compensating for anything ;)
  • 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: Lentamentalisk » Sat Mar 21, 2009 2:31 pm

The one thing I really see you having a problem with is getting it to stop (and then start back up when you want it to)
You may have to make some sort of shear that connects to your little needle extension thingy.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Mar 21, 2009 2:53 pm

Lentamentalisk wrote:The one thing I really see you having a problem with is getting it to stop (and then start back up when you want it to)
You may have to make some sort of shear that connects to your little needle extension thingy.


I had outlined a rough mechanism here, if I get it to function well at high pressure I'll first add a barrel to evaluate power, then add a reloading mechanism for the ammunition and eventually a sear/bolt handle and trigger.
  • 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], Yahoo [Bot]

Reputation System ©'