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modded bbmg

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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modded bbmg

Unread postAuthor: f.c » Tue Sep 04, 2007 3:08 am

this is my newest bbmg. i made it about a month ago but have neglected to upload pictures yet. it shoots in burst fire (5 round each time) this is due to the system i made with rubber tubing to both decrease the r.o.f and increase the power. one b.b can penetrate a tin can with ease.


pipe sizes. 50 mm for chamber
25 mm for barrel
6.0013 mm pipe for b.b's (made to fit b.b from hobby shop expensive)


blowgun was modified to allow more airflow.

the rubber tubing used was exactly just under 6mm.



please tell me what you think. and by the way theres many many more to come.

Image
the blow gun
Image
the end of the pipe isnt painted because i had a scope on it.
Image
the unique rubber tubing system which is fed by a cloud chamber.
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Last edited by f.c on Tue Sep 11, 2007 6:07 pm, edited 1 time in total.
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Unread postAuthor: Redcoat » Tue Sep 04, 2007 3:16 am

Sexiest BBMG ever, I hope it works as well as it looks. :wink: .
Damage Pics?
I saw a rubber tubing method like this on instructables.

Happy Spuddin'
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 04, 2007 3:18 am

Very interesting, the rubber tubing idea has been thrown around for years but I don't think I've ever seen it successfully applied. What sort of rate of fire are you getting, is it possible to see a video?

one b.b can penetrate a tin can with ease.


By "tin can" do you mean soup can or aluminum soda can? Oh and any way you can chrono the velocity?
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Unread postAuthor: f.c » Tue Sep 04, 2007 3:27 am

i doubt i can chronograph it but a video i shall make soon if you wish. the range isn't that great but for some weird ass reason the bb's curve to the sides sometimes i think this is because i cannot use bb's (because i live in Australia) and instead i use beads which aren't completely cylindrically when i used proper airsoft bb's i can hit my a can 20 meters away easily. any suggestions on increasing accuracy ?

and should i enter this in the airsoft and paintball gun competition.


and jack i meant aluminium can. though the bb smashes and puts a nice dint in steel cans.
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Unread postAuthor: MrCrowley » Tue Sep 04, 2007 3:32 am

f.c wrote:i doubt i can chronograph it but a video i shall make soon if you wish. the range isn't that great but for some weird ass reason the bb's curve to the sides sometimes i think this is because i cannot use bb's (because i live in Australia) and instead i use beads which aren't completely cylindrically when i used proper airsoft bb's i can hit my a can 20 meters away easily. any suggestions on increasing accuracy ?

and should i enter this in the airsoft and paintball gun competition.


and jack i meant aluminium can. though the bb smashes and puts a nice dint in steel cans.


What competition?

Nice gun btw, I've always wondered if the tube idea works effiecently
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 04, 2007 3:34 am

and jack i meant aluminium can. though the bb smashes and puts a nice dint in steel cans.


Thought so, it takes several hundred fps with a 0.22 gram BB to penetrate a steel can, a strafer that could do that would be very scary indeed.

The irregular shape of your beads easily explains the inaccuracy, the only way to improve it is obtain proper BBs or go for a 4.5mm barrel and use 0.177" steel BBs.
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Unread postAuthor: f.c » Tue Sep 04, 2007 3:36 am

if i can find cheap airsoft bb's i would do it. and this gun is very powerful trust me. my 6 year old sister loves this gun and blows cans apart all the time. i shall get a video asap.
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Unread postAuthor: Redcoat » Tue Sep 04, 2007 4:53 am

F.c., i know where you can get bb's on bulk i've bought thousands.
Just go on ebay and search it and buy, Bb's aren't illegal, BB guns are illegal.
And they're hella cheap. :D .

A video would be nice.

Look here for more info on bb's from ebay. You can import them so go for it. Or just buy them while in another country and pack them in your baggage and you'll be fine.
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Unread postAuthor: blind909 » Thu Sep 06, 2007 10:54 pm

if you straighten the rubber tube at the end or cut it off at the end it will stop the bbs from curving over.
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Unread postAuthor: TwitchTheAussie » Fri Sep 07, 2007 5:02 am

Or you could buy wheel bearings. They're pretty cheap in boxes of about 100 around 30 cents
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Unread postAuthor: f.c » Fri Sep 07, 2007 7:41 am

im going to look into those wheel ball bearings to i just ask for 6mm or what ?
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Unread postAuthor: blind909 » Sun Sep 09, 2007 10:05 pm

probably, or just get metal cake decorating ballz.
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