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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: Brian the brain » Sat Oct 31, 2009 3:12 pm

Nice way of automatatiserising the falling block...
Maybe I mispelled that..


:D

Blocker bolt still rules.. :wink:
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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!!
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 31, 2009 3:36 pm

I had though up an electrically powered version of this a while ago:

Image

The issue I see is sealing, in many ways the blow forward bolt operates on the same principle with a different geometry.

On a different note, I can't believe I got so far with this valve and didn't go on to make a complete valve and magazine system :roll:
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Unread postAuthor: Brian the brain » Sat Oct 31, 2009 3:42 pm

Story of your life..

such a shame
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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!!
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Unread postAuthor: kenbo0422 » Sat Oct 31, 2009 4:02 pm

So THATS what its called, eh? Originally, the loop on the right side was not there and it fed air from the top right. A mechanical actuator lifted the valve open and it DID have a rather strong magnet on it to retain the BB until the other valve was open (not shown).

Edit: Machining a nylon 'bolt' should give you a small enough clearance to not have to worry about leakage. Either that or a lot of little teeny O-rings to exasperate the crap out of you.

Oh, and thanks for the compliment. I 'automated' this valve for a bbgun made from nothing but brass fittings and tubes a couple of years ago. I just needed Jack's talent for encasing the whole thing in epoxy to make it look/handle well.
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 01, 2009 12:24 am

kenbo0422 wrote:Machining a nylon 'bolt' should give you a small enough clearance to not have to worry about leakage. Either that or a lot of little teeny O-rings to exasperate the crap out of you.


I avoid o-rings like the plague, mainly because they have to be replaced and my "talent" for encasing stuff in epoxy usually doesn't allow for much maintenance. It is conceivable to have a good seal from a tight fit though, this is after all how the original Girandoni works:

Image

Image

The Girandoni system - upper two images show tubular ball magazine on right side of gun, distinctive loading block traversing the receiver. Note that receiver casting is a single top piece. Again notice the smooth transition in lines between the receiver and the air reservoir in this authentic specimen. Lower image shows the sliding loading bar with its ball socket and with the right hand retaining screw removed. These loading bars were tapered so precisely that, before the magazine spring was added during reassembly, the bar would slide into an airtight battery position by its own weight!
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