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 69 users online :: 4 registered, 0 hidden and 65 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

reliable feeding

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: psycix » Sun Sep 20, 2009 9:50 am

Whenever you can, simply use a tubemag.
  • 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 » Sun Sep 20, 2009 9:51 am

POLAND_SPUD wrote:I doubt that double feeds have anything to do with the hopper... is there anything that stops bbs from entering the barrel?


I might have put an o-ring as a detent, don't remember :roll:

Question, Why not just buy a paintball hopper and modify it for your needs?
You can get them fairly cheap.


In my case these are for a small calibre so it wouldn't really be useful, but good idea for those using marbles.

psycix wrote:Whenever you can, simply use a tubemag.


As I mentioned in the original post, tube mags are limited by capacity - you'll never get the kind of long bursts one sees in belt fed machineguns.
  • 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 » Sun Sep 20, 2009 10:15 am

I might have put an o-ring as a detent, don't remember
well yeah that was dumb but what about the other side of the T then?

if it's constructed teh way it should it's even more interesting...
the hopper is sealed right ?? if so then possibly the tube doesn't offer enough fit and too much air enters the hopper... then it exits the same way it got in carrying bbs with it

EDIT
I tested the idea in Phun... while I couldn't reliably replicate what I wanted to test in the first place (as I couldn't simulate the effect that air has on bbs) I came up with this

a piston with a spring behind it would oscillate with each shot (as some air passes into the hopper.. here it's simulated with a basic motor)

I don't know how accurate phun is but I simulated several different configs of a simple hopper and BBs did jam
  • 0

Attachments
pic.jpg
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 » Thu Oct 08, 2009 12:09 am

psycix wrote:Whenever you can, simply use a tubemag.


I've been thinking about this, the most annoying thing about tube magazines is that they need a lot of length, especially with the spring taking a considerable amount of space.

I came up with this variant that might just do the trick though. The spring is eliminated, as the BBs are pushed along by the air coming from the valve, and you have a magazine that's twice the length of the barrel. Assuming 4.5mm BBs, this means that using a reasonably sized 50cm barrel, you could fit well over 200 BBs, when your average "real" submachinegun fits around one tenth of that. If that still isn't enough you could always increase the number of "coils".
  • 0

Attachments
tubemag.gif
tubemag.gif (3.93 KiB) Viewed 646 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: kozak6 » Sat Oct 10, 2009 2:08 am

I've had similar thoughts about the rotor design, maybe something closer to a vortex strafer with a rotor in it. Perhaps something where the BB could be trapped/pinched between the rotor and O ring while pressure builds up.

As for the above picture, what do you think about using a 1/4" coiled air hose as a magazine?
  • 0


kozak6
Private First Class
Private First Class
 
Posts: 38
Joined: Mon Aug 17, 2009 10:14 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Oct 10, 2009 11:28 am

The rotor could easily be electrically powered for independetly variable rate of fire, but that's too much of an added complication in my book.

kozak6 wrote:As for the above picture, what do you think about using a 1/4" coiled air hose as a magazine?


Dewey suggested that here, if you could find suitable hose coiled suitably tightly, why not.
  • 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: Brian the brain » Sat Oct 10, 2009 1:01 pm

I think you should connect the top of the hopper to the piston to make sure it works.
I mean..The top of the hopper would be the piston, with a rod to plug the feedhole.
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Sponsored

Sponsor
 


Unread postAuthor: al-xg » Sat Oct 10, 2009 2:34 pm

I've used some tube magazines on a paintball marker, but ended up using an elastic band pulling the piston back instead of of a spring. That adds alot of capacity.
And well it easily keeps up with high ROF, much more reliable than a simple hopper.
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Oct 10, 2009 2:44 pm

I've decided to give the tube mag a try:

Image

It's currently sealed up and swimming in slowly solidifying epoxy, I'll give it a whirl tomorrow at 50-100 psi and see what happens :)
  • 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

Previous

Return to BB/Airsoft/Pellet Gun Discussion

Who is online

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

Reputation System ©'