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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.
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 07, 2008 1:24 pm

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Unread postAuthor: Jared Haehnel » Fri Mar 07, 2008 1:26 pm

8) Nice!!!! But for 550...I think I'm going to pass....
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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...
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Unread postAuthor: Antonio » Fri Mar 07, 2008 3:48 pm

yeah these paintball conversions are really cool! They even have bbs with fins at the back with have a lower drag coefficient so fly further. If I had these in a shop nearby I would buy one for sure. I think it has a CO2 tank in the buttstock. The only thing that kinda sucks is that u will have all these plastic cups laying on the field ur playin.
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Unread postAuthor: Sticky_Tape » Fri Mar 07, 2008 3:59 pm

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

I don't think you have to because the bolt would come back anyway so all you need is a valve behind the hammer valve that would allow air in through the hammer valve and push the bolt forward.
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Unread postAuthor: Sticky_Tape » Fri Mar 07, 2008 4:03 pm

jackssmirkingrevenge wrote:Try this one.


try this one :) http://www.youtube.com/watch?v=Na_o3IAFXtI&NR=1
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Unread postAuthor: Hawkeye » Fri Mar 07, 2008 4:09 pm

Now I can't find it or remember the link. It was all homemade conversion though. I think a Brass Eagle base with a customized barrel addition etc.
Perhaps I should have said stumbled across, although after you see it who knows.... He did use some Epoxy in the conversion.

Edit: "Unconventional Airsoft"
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Unread postAuthor: jackssmirkingrevenge » Sat Mar 08, 2008 10:38 am

Ah, you mean this one? I was familair with it, that's a good web page :)
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Unread postAuthor: Antonio » Sat Mar 08, 2008 2:42 pm

pretty cool gun. I was thinking of just buying a airsoft gas magazine and making my own gun around it. It would only cost 25E then. I would convert the co2 tank in the mag to a colabottle below it.
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Unread postAuthor: Antonio » Sun Jun 22, 2008 2:38 pm

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


I rethought this one over. I think this concept is doable as I got autofire but without bbs fireing. I was thinking of pumping air between the bolt and the poppet valve. So if you drill a small hole between those parts you can easily connect a bikepump to it:) So there wont be need for mechanical levers or something. This will make it smaller and less vonurable. I hope you know what I mean
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Unread postAuthor: Antonio » Wed Jun 25, 2008 4:24 am

At the moment I am working on a prototype of this idea:
Image
I know Jack has tested it as well, but I think this design is promising as there are not that many moving parts. I'll post an updated animation soon:)
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 25, 2008 9:40 am

ant wrote:I know Jack has tested it as well, but I think this design is promising as there are not that many moving parts.


I had illustrated the concept but didn't actually make a prototype so the ball's in your court. The theory seems to be sound, all we need is for someone to make it work, and I'd say you've got the right credentials ;)
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Unread postAuthor: Antonio » Wed Jun 25, 2008 12:13 pm

The animation I made some time ago.
The yellow circles are O-rings btw
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The animation I made some time ago.
Last edited by Antonio on Fri Jul 04, 2008 5:37 am, edited 1 time in total.
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Unread postAuthor: Tom » Thu Jul 03, 2008 6:16 am

I think that it's hard to get a good seal between the hammer and the valve stem, but it's always worth trying :D
G's from the Dutch, Tom
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 04, 2008 6:09 am

It certainly looks good in theory, are you going to try it out?
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Unread postAuthor: Antonio » Fri Jul 04, 2008 4:45 pm

jackssmirkingrevenge wrote:It certainly looks good in theory, are you going to try it out?


Yeah for sure! I finally have vacation now... jaaaaaaaaaaaaa! I had my last exam today :lol:
my only problem is making the moving part(breech/bolt) out of 3 different tubes like I did on the slidevalve> the problem is attaching these 3 different sized alu pipes together. Glue wont do it as I dont have enough surface area to work at. I thought about holding ehm togetha with small nails perpendicular through it. But that would limit the flow through the breech hole. I hope u guys get what I mean.. I would be happy with some feedback:) (btw I am not making this part from epoxy as I want to keep the parts cheap and easy to make) Atm I am ganna prototype and epoxy isnt the material I have in mind> I want to go 100% ant style :D

example materials I am planning to use:
Image

edit:
this is the breech/hammer part (I dont know how to join the different alu pipes which are given in different shades of grey)
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breech hammer part
breech.JPG (7.08 KiB) Viewed 597 times
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