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making the blow-forward breech work

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 14, 2008 12:09 am

mega_swordman wrote:I take it you are referring to BTB's design, or are you going for something else?


Something a bit more sophisticated than that, remember this idea? I figure I could make something like this fairly easily:

[youtube]http://youtube.com/watch?v=VXK77v0Opuk[/youtube]

Might even figure out an ejector too :D


... either that or I'll make it a coaxial for some real power.
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Unread postAuthor: Sticky_Tape » Fri Mar 14, 2008 9:53 am

You know JSR I thought your goal with those carts wher to get full auto none the less good Idea but I would make the shotgun a single shot I don't like the Whole great idea with double barrels.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
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Unread postAuthor: Jared Haehnel » Fri Mar 14, 2008 10:19 am

Doesn't the P90 use a blow forward action?
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Unread postAuthor: Sticky_Tape » Fri Mar 14, 2008 10:41 am

Jared does your post have relevance to the topic?
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Unread postAuthor: Jared Haehnel » Fri Mar 14, 2008 10:49 am

It did since we were talking about making a blow forward action pneumatic....

However I just looked it up and its an interesting topic if anyone is interested... but I found out the p90 doesn't have the action I thought it had...

So in short It appears no that it didn't have any relevance though I thought it did at the time...

Confused yet?
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Unread postAuthor: Sticky_Tape » Fri Mar 14, 2008 7:27 pm

Not at all Jared carry on with hijacking topics... :P
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Unread postAuthor: iknowmy3tables » Sun Mar 16, 2008 11:50 am

no I don't know any gun has blow forward, it might have forward ejecting cartridges but blowforward, no
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Unread postAuthor: iknowmy3tables » Thu Mar 20, 2008 9:11 pm

hey I think I'll be joining in on the experimenting with bb systems like jack and ant, I found that some of my scrap goes together perfectly for making such stuff: 6mm OD copper pipe that I got from school that sleeves in some plastic tubes that packaged some flexible glow sticks that can make bb barrels, which can be sleeved in a metal rod from my fire extinguisher, which can sleeve into my scrap 1/2 cpvc, which can be sleeved in 1/2" pvc
I also got some springs to fit around the copper pipe

so out of luck I can produce 5 layers of sleeving with my random scrap tubing and pipe. the first thing I'm gonna try is this blow forward breech
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Unread postAuthor: Antonio » Fri Mar 21, 2008 3:41 am

iknowmy3tables wrote:hey I think I'll be joining in on the experimenting with bb systems like jack and ant, I found that some of my scrap goes together perfectly for making such stuff: 6mm OD copper pipe that I got from school that sleeves in some plastic tubes that packaged some flexible glow sticks that can make bb barrels, which can be sleeved in a metal rod from my fire extinguisher, which can sleeve into my scrap 1/2 cpvc, which can be sleeved in 1/2" pvc
I also got some springs to fit around the copper pipe

so out of luck I can produce 5 layers of sleeving with my random scrap tubing and pipe. the first thing I'm gonna try is this blow forward breech


cool, goodluck
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Unread postAuthor: iknowmy3tables » Wed Mar 26, 2008 2:44 pm

I hope you don't mind if I post up my prototype progess on your thread jack, since I 'm using the same design.

okay, I've made a prototype but, of course it doesn't work yet, also I'm not a great craftsman so it leaks like crazy and many parts are hot glue and some are held together during testing, so far I cant get the bolt to go back I guess its because of the leaks around the ball
Image
fyi: the thing on the back is a flow control valve

jack do you have any tips to get this to work? you sorta made it work and thats farther than I got

oh yeah I forgot to mention I just hit a 1000 posts, this is 1001
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 26, 2008 11:35 pm

can you post details of the internals?
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Unread postAuthor: iknowmy3tables » Thu Mar 27, 2008 12:59 pm

I think I know what I need after I saw ants new design
well this is the general inside layout of my prototype from the last post
Image

and now I'm trying a new design, basically I'm just using a a diffrent hammer valve more like ant's and I'm making a wider bolt/piston base
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 27, 2008 1:25 pm

How do you cock the bolt forward for the first shot?
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Unread postAuthor: iknowmy3tables » Thu Mar 27, 2008 3:35 pm

I don't know, does it have too, I though it would be more reliable if I wasn't dependent on momentum, can't the spring tension on the bolt exceed the force on the hammer valve?
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Unread postAuthor: iknowmy3tables » Thu Mar 27, 2008 9:19 pm

did I just fail :?
Image
Am I completly wrong about the last post, is it a hammer valve because it uses momentum like a hammer, sigh, alright I guess I'll have to make a quick and dirty pin trigger, and to cock it I'll have to open the whole thing and manually push it forward
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