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Drozd type of bb gun

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: Antonio » Sun Jan 20, 2008 3:01 pm

turbosharp wrote:Hi ant, really like your idéa to follow the drozd example! but hey how is the project coming along? cant you post some pics or something, Im really curious :D

//oscar


Image

This is a picture I took and posted under my topic of homemade valves. The problem is that the orings exert too much friction on the inner tube, so it has difficulties moving. I am working on some kinda milling method to get this tube smaller in our diameter. I tried with sanding paper but its hard to get the radius even. I also realized that if you make the tube too small it is very keen'' to leaking when u move it perpendicular to the copper fitting.

Image
Homemade valves
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Unread postAuthor: turbosharp » Mon Mar 17, 2008 2:06 pm

Hello again ant. Just wanna check how your prototype is going, got it working or put the project aside? well I wonder cus I'm now making a drozd-type gun myself, have actually come quite far. but like the pedantic I'am, I'll be happy if it will be working before summer ^^
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Unread postAuthor: Antonio » Tue Mar 18, 2008 7:37 am

turbosharp wrote:Hello again ant. Just wanna check how your prototype is going, got it working or put the project aside? well I wonder cus I'm now making a drozd-type gun myself, have actually come quite far. but like the pedantic I'am, I'll be happy if it will be working before summer ^^


It didnt work as the sliding seal had too much friction for the hammer to slide or it had too little which made the whole system leak. So go for something like a valve/hammer or piston setup:)
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Unread postAuthor: turbosharp » Tue Mar 18, 2008 10:23 am

Okey I understand, well my valve mechanism is allready made, not tested thow. the sliding problem wont happen since I will have a relatively strong feather and solenoid. but Im having a bad feeling of leakproblems coming up, after all its 60bar co2..
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Unread postAuthor: Antonio » Sat Mar 22, 2008 5:20 pm

turbosharp wrote:Okey I understand, well my valve mechanism is allready made, not tested thow. the sliding problem wont happen since I will have a relatively strong feather and solenoid. but Im having a bad feeling of leakproblems coming up, after all its 60bar co2..


Wow some very high pressures there. Would be awesome if you could post some of your results here:) Awesome work!
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Unread postAuthor: turbosharp » Fri May 16, 2008 11:31 am

sorry for the lack of response. the build is going forward but yester day was a bad day. my plan was to take a pipe for the co2 and weld it together with the main housing. Well it didn't work, stop it from leaking was harder than i taught and that was just with water without no pressure. I tryed both mig/mag and tig welding, so now i am out of ideas =/
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Unread postAuthor: Antonio » Fri May 16, 2008 3:07 pm

try to solder it (the holes) and then quench it. Like this it should be able to withstand higher pressures. When you use the extra soldering agent the solder flows in holes with ease:) Good luck! Do you have any pics of the valve?
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Unread postAuthor: POLAND_SPUD » Fri May 16, 2008 3:43 pm

@turbosharp wow - post pics as soon as possible...

BTW the pic of the lego set, the one that is on the 3rd page of this thread is not fake it is a work of art created by some polish artist, AFAIK he got to jail for that :lol:
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Unread postAuthor: turbosharp » Fri May 16, 2008 5:07 pm

I actually thought of that but was curios if it would attach to the metal or not. But maybe your right, its defenetly worth a try!
I'll wait with the pics until I'm done or completely fails

if this soldering works its ready to be tested, wether it works or not its a long way to go until im done, but hang in there! :D
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Unread postAuthor: covey12 » Mon Oct 20, 2008 3:08 pm

wow that things looks great, looks like something you actually bought from a store, nice job(even though you somewhat did)
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Unread postAuthor: Antonio » Mon Oct 20, 2008 4:08 pm

covey12 wrote:wow that things looks great, looks like something you actually bought from a store, nice job(even though you somewhat did)


The Drozd is sold online yes. I only brought this up for inspiration. I did make the copper valve myself. But the magazine on the first page is from some website:)
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Unread postAuthor: Brian the brain » Tue Oct 21, 2008 2:13 am

I made the exact same valve over 5 years ago.I too had the friction problem.
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Unread postAuthor: Antonio » Tue Oct 21, 2008 2:58 am

Brian the brain wrote:I made the exact same valve over 5 years ago.I too had the friction problem.


But your brother has a lathe right? You prob could make it work now then:)
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Unread postAuthor: Brian the brain » Tue Oct 21, 2008 5:25 am

I'll stick with the pressure washer handle.
If you remove the outer body and just use the valve itself, you can have the CO2 12 gram adapter inside of the grip and the flow coming out towards the back ( make your own trigger)

That way you could build an UZI like bbmg off of 12 grams, ultra compact.
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Unread postAuthor: Antonio » Tue Oct 21, 2008 10:02 am

Brian the brain wrote:I'll stick with the pressure washer handle.
If you remove the outer body and just use the valve itself, you can have the CO2 12 gram adapter inside of the grip and the flow coming out towards the back ( make your own trigger)

That way you could build an UZI like bbmg off of 12 grams, ultra compact.


You mean its a good idea to buy the magazine with valve and co2 adapter: Image
And build you own stock/triggering around it?
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