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Hammer valve (Soon-to-be)semi-auto gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Hammer valve (Soon-to-be)semi-auto gun

Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 6:32 am

Hi there fellow spudders,
after following the site quite a long time (not only this site, but quality it has ;)) I decided to build a semi-automatic gun that would just consist of parts you can buy everywhere. Thats because i have no access to any higher machines, im happy I own a screwdriver :P

Im going to build a stock asap, I´m thinking of some hot glue covering painted black so the somewhat gettoish design is hidden :P

Enough talking, some pics(notice that the gun isn´t fully assembled, as I´m missing a single part to connect the barrel and that barrel and magazines are also missing. Some diagrams will be added though)
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Attachments
DSC04732.JPG
whole gun
DSC04733.JPG
valve part (no hammer there yet)
DSC04734.JPG
filling shrader(i like the cleanness of this)
quark.png
quark.png (6.48 KiB) Viewed 2258 times
Last edited by The_Guerilla_Guy on Tue Dec 07, 2010 6:45 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 6:40 am

Looks like it would work well, how does your valve look internally?
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Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 6:50 am

jackssmirkingrevenge wrote:Looks like it would work well, how does your valve look internally?


I edited a pic to the top. basically its a screw with a washer and metal plate srewed to the end. I drilled a hole into the end of that endcap until it fitted nicely. might be leaking a bit, but I haven´t found a proof for that ;P

I already tested it without a barrel, everything is airtight and at about 7 Bar it gives a nice bang :twisted: Without a hammer i didn´t manage to get more than two shots out of it, because i hit it to hard
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 6:58 am

Looks good but there's quite a lot of "dead space" (volume between the valve and barrel) which makes it less efficient, what calibre will you be using it for? If it's airsoft or 4.5mm BB, it would be better to use 1/4" or 1/8" parts for the hammer portion, you'll get more power from each shot.
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Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 7:07 am

Yes, there is some dead space, but im going to use it with an 1/2 inch barrel and some steel balls that fit it. Also, that is all i have when it comes to parts, since I have to walk (dont have a drivers license yet) about ten kilometers to the next hardware store, which has become somewhat difficult concerning the temperatures here :) but maybe I´ll do that in the near future. my first problem is the magazine. I thought about a spring loaded tube in a tee connected to the barrel. But wouldn´t it be a waste of power to just load the bbs into the barrel without a bolt closing the gap into the magazine?
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 7:12 am

The_Guerilla_Guy wrote:I thought about a spring loaded tube in a tee connected to the barrel. But wouldn´t it be a waste of power to just load the bbs into the barrel without a bolt closing the gap into the magazine?


Image

As you can see, the next BB effecively blocks the magazine so very little air is wasted provided the tube in which the BBs has an internal diameter very close to the BB diameter.
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Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 7:20 am

Hmm ok, I´ll try that then for the moment. i hope to find some nice HPA tank with a remote regulator as youz showed me the other day. That would be a beast. any idea if it is possible to recock the hammer to power a full auto? I thought i could build a tee where the elbow is now, leading it just infront of the hammer, but that would be a huge lot more dead space.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 7:30 am

The_Guerilla_Guy wrote:any idea if it is possible to recock the hammer to power a full auto?


I tried and failed, but it's not impossible ;)
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Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 7:44 am

Think this may work?
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Unread postAuthor: Crna Legija » Tue Dec 07, 2010 8:45 am

it looks like it might, you'd probable need 200+psi
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Unread postAuthor: Gaderelguitarist » Tue Dec 07, 2010 10:27 am

Im going to build a stock asap, I´m thinking of some hot glue covering painted black so the somewhat gettoish design is hidden


So you intend to essentially cast a stock out of hot glue? That's a new one.

since I have to walk (dont have a drivers license yet) about ten kilometers to the next hardware store, which has become somewhat difficult concerning the temperatures here


Someone is dedicated to building stuff.

While your idea for a self cocking hammer looks doable, the proportions need to be tweaked a little. Don't walk twenty kilometers to find out that you need more parts, or didn't design it well enough. The little sear at the bottom looks like you'll have the ability to do semi and a slow cycling full auto if it all works as planned.
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Unread postAuthor: FighterAce » Tue Dec 07, 2010 10:53 am

The_Guerilla_Guy wrote:since I have to walk (dont have a drivers license yet) about ten kilometers to the next hardware store


You dont require a drivers license for a bicycle :D
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 07, 2010 1:28 pm

Gaderelguitarist wrote:While your idea for a self cocking hammer looks doable, the proportions need to be tweaked a little.


It certainly needs "tweakability", you're going to have to vary bolt and hammer spring strength/travel and perhaps hammer weight until you get it working satisfactorily.

Here's a design I had come up with incorporating a sleeve type loading mechanism, never built it though:

Image
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Unread postAuthor: The_Guerilla_Guy » Tue Dec 07, 2010 1:54 pm

So you intend to essentially cast a stock out of hot glue? That's a new one.


I dont think so. I think I saw a grip made with something similar, a blowgun casted in some sort of glue, but I don´t remember who it was. But I agree as I haven´t seen a whole stock made out of it.

You dont require a drivers license for a bicycle Very Happy


Yes true, but I normally go there from school, to which I get by bus XD and riding a bicycle when the whole street is frozen is just funny when you can watch other people do it :P

It certainly needs "tweakability", you're going to have to vary bolt and hammer spring strength/travel and perhaps hammer weight until you get it working satisfactorily.


I could make the lower spring tweakable by addind a screw to the end to loose the strength. The upper spring should do fine as its only there to get the bolt pack in position, which doesn´t have to be extremely fast at least for semi-auto. Hammer and bolt weight would have to be tried several times though I think.


Here's a design I had come up with incorporating a sleeve type loading mechanism, never built it though:


This is nearly similar to a design i came up with yesterday, basically the air pushes the bolt back, creating something like a virtual second chamber. My only concern is that, to get the full power, this tube would have to be the same length and diameter as the actual barrel, wouldn´t it?

Image

Edit: Ok, i see I´m too dumb to attach an image. Pic added to attachment.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 08, 2010 12:08 am

The_Guerilla_Guy wrote:This is nearly similar to a design i came up with yesterday, basically the air pushes the bolt back, creating something like a virtual second chamber.


That's actually quite a good idea :)

My only concern is that, to get the full power, this tube would have to be the same length and diameter as the actual barrel, wouldn't it?


Not necessarily, depends what pressure you're using. If you're using 8 bar for example, the tube can be 7 times smaller than the volume of the barrel and it will work.
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