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Rattlesnake V3 - HPA auto valve

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: dewey-1 » Mon Apr 20, 2009 2:05 pm

jackssmirkingrevenge wrote:
dewey-1 wrote:Just think, JSR has about 36 to go. :D


Oh come on, I'm *this close* to getting the final prototype I've always dreamed of :D

JSR; You better re-read my previous reply!

I really did give you positive re-enforcement by my statement about v 4.0
:D
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 20, 2009 2:08 pm

dewey-1 wrote:I really did give you positive re-enforcement by my statement about v 4.0 :D


You did :) well it's done now, we'll see what tomorrow brings.
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Unread postAuthor: psycix » Mon Apr 20, 2009 5:03 pm

Dont test before its fully cured! :evil:
I already ordered the succesboat you know... :D :P
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 21, 2009 12:06 am

psycix wrote:Dont test before its fully cured! :evil:


I left them out in the sun while I'm at work, I'll probably spend a few extra hours here just to make sure I don't get my hands on the valves prematurely :D

I can also spend some time repairing my chrony, someone managed to graze the exposed wires with a BB last time it was used :cry:
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Unread postAuthor: daberno123 » Tue Apr 21, 2009 6:09 pm

jackssmirkingrevenge wrote:I can also spend some time repairing my chrony, someone managed to graze the exposed wires with a BB last time it was used :cry:


Same thing happened to mine, although I also dented the middle plate. It's no fun, is it? :wink:

I suppose I'm lucky I managed to miss both the sensors, that would really bad. I just took mine out recently and kept getting error messages, hopefully it was just poor lighting (it was pretty cloudy out.)

Best of luck with the new prototype! :D
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 22, 2009 12:05 am

daberno123 wrote:Same thing happened to mine, although I also dented the middle plate. It's no fun, is it? :wink:


Always an occupational hazard with chronys, you'll be hard pressed to meet someone who's never shot his :roll: :D

In an unprecedented display of prudence, I've decided to control my urges and give the prototype 48 hours of curing time so no testing yet, give it a couple more hours :)

edit: tested and I couldn't get it to cycle reliably, I think the smaller chamber was a mistake. I'm remaking it with a bigger one, and this time hooked up to a 1/2" BSP ball valve which screws nicely on to the bottle so once it's done I'll have something that can be turned into a complete launcher.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 23, 2009 10:47 pm

Update:

Version 4.1 is done with modifications outlined above :)
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Unread postAuthor: Carlman » Thu Apr 23, 2009 11:25 pm

Tested yet?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 23, 2009 11:32 pm

Carlman wrote:Tested yet?


Still waiting for it to cure completely
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Unread postAuthor: Lentamentalisk » Fri Apr 24, 2009 12:25 am

Lol! Asides from the little pipe sticking out of the thing, it looks exactly like a simple ball valve pneumatic cannon, hooked up to a scrapped HPA tank for a chamber. Thats great.
It does look quite sleek though, good job.
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 24, 2009 1:46 am

Lentamentalisk wrote:Asides from the little pipe sticking out of the thing, it looks exactly like a simple ball valve pneumatic cannon, hooked up to a scrapped HPA tank for a chamber


Ironically the valve came from my first marble gun which was just that :)

It does look quite sleek though, good job


Thanks, now I'm thinking beyond just having something that works to something that can finally become a completed launcher with trigger, grip etc.
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Unread postAuthor: inonickname » Fri Apr 24, 2009 2:32 am

Good work!

I'll be impressed if you can turn out something similar appearance and function to this. I'm sure you could even do a nice fancy mag..not that it's absolutely required.

On the subject of that gun, if the mechanism is in a suitable location you could add a "recocking bolt" (seen in blowbacks etc) to the pop off through a milled or routed slot. If done well it wouldn't affect performance and would look so cool going back and fourth (no matter how useless it is).

Good job

Edit: Wth, it's still in the prototype stages. It said that months and months and months ago..ages.. (the gun i linked to)
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Unread postAuthor: jook13 » Fri Apr 24, 2009 2:45 am

Thanks, now I'm thinking beyond just having something that works to something that can finally become a completed launcher with trigger, grip etc.


Gotta admit, I have been waiting a long time for that. Cant wait!
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 24, 2009 4:53 am

jook13 wrote:Gotta admit, I have been waiting a long time for that. Cant wait!


You and me both, I've been wanting a launcher with this sort of performance for years!

On the subject of that gun, if the mechanism is in a suitable location you could add a "recocking bolt" (seen in blowbacks etc) to the pop off through a milled or routed slot. If done well it wouldn't affect performance and would look so cool going back and fourth (no matter how useless it is).


I see where you're coming from, it would be cool to actually see something cycling backwards and forwards. I could always hook up the piston to a "magazine interrupter" to ensure it never double feeds.
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Unread postAuthor: POLAND_SPUD » Fri Apr 24, 2009 5:19 am

sorry for going off-topic (or maybe it's not off topic)

but I have an idea... basically this design should offer more less the same performance as yours

it's pretty self-explenatory....
there is a 3 way spool valve :wink: when it is the 1st positon it directs air into a chamber which is attached to a single air cylinder... pressure extends the air cylinder and it actuates the spool valve

in the second position air is directed from the chamber and aircylinder to the 3rd port (the barrel)

as soon as the air cylinder retracts and the valve switches to the 1st postion the cycle repeats

EDIT
it's not that I suggest him quiting his design or that I am going to try it myself in the near future... let say that posting ideas in his threads dedicated to creating a fullauto valve (yeah there were many of them) is a kind of tradition...

this post is just to show that you don't need a solenoid to use a spool valve for small bore full auto guns... I spent some time playing with 3 way valves and air cylinders and I am sure it will work
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