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MB2 - edit : second edition

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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MB2 - edit : second edition

Unread postAuthor: POS » Wed Oct 11, 2006 4:32 pm

MB2 (Marble Blaster II)

[albumimg]233[/albumimg]

Here it is, my second pneumatic gun, only two weeks after I finished the first one :

* as I sead, it is pneumatic
* made fully out of metal (copper)
* uses barrel sealing piston valve
* pilote valve triggered by a 3/4 balvalve
* dual chamber 34 mm copper pipe
* rest of the gun is made at 28 mm copper pipes and pices
* pressurizing valve is a bycicle tire valve
* C:B ratio, depends on the barrel type, at least 2:1 with the 34 mm barrel
* it has exchangable barrels, 10 mm, 15 mm, 18 mm, 22 mm, 28 mm, 34 mm and a 1 inch galva barrel

[albumimg]234[/albumimg]

Ammo : about everything I can lay my hand on :twisted:
For starters I use marbles, both small ones (16 mm) and big ones (26 mm)

I testfired it, and it leaked at the piston valve. So I changed the rubber, nog it is ok. I could only testfire it at 100 psi, dont have more pressure untill my high pressure pump is ready.

Here the damage pics :

[albumimg]236[/albumimg] [albumimg]237[/albumimg]

and a pic of the actual test fire ammo

[albumimg]235[/albumimg]

Me holding the gun, so you can see the size :

[albumimg]238[/albumimg]

Improvements since the MB1 :

* shorther space between the piston valve and the ammo
* bigger chamber
* better piston
* ighter than a galva gun

What still needs to be done :

* make a wooden stock
* make a wooden handgrip in front
* give the whole thing a paintjob (will be non-shining black)


Now some questions :

What about this gun, you like it ?
What can I do to improve ?
At what pressure you think I can shoot this one ?
Do you like the concept of the twin chamber in this gun ?

Edit : forgot to mention the cost : about 100 euro.
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Last edited by POS on Tue Oct 17, 2006 3:28 pm, edited 5 times in total.
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Unread postAuthor: Mr.Taterhead » Wed Oct 11, 2006 5:09 pm

:D I like it man and I love the ammo. What kind if rubber are you useing for the barrel seal ??
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Unread postAuthor: POS » Wed Oct 11, 2006 5:16 pm

rubber from a bycicle tire :)

The inner tire that is
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Unread postAuthor: MrCrowley » Wed Oct 11, 2006 9:03 pm

wow nice copper gun,if you put a wooden hand grip on you should get that grip paper stuff that you find on rifle stocks at the front :twisted:
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Unread postAuthor: rna_duelers » Thu Oct 12, 2006 1:28 am

Nice,but the pics are a little small to see the in good detail.And yes i like the twin chamber and i wouldnt be afraid to take it to 250psi 17bar.
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Unread postAuthor: killagorrila99 » Thu Oct 12, 2006 7:23 am

Thats why you click on the pictures.!!! loverly gun ya got there, any idea on distance?
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Unread postAuthor: POS » Thu Oct 12, 2006 4:25 pm

Haven't tried distance yet. I live in the woods. Lots of trees here ;)
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Unread postAuthor: POS » Tue Oct 17, 2006 12:14 pm

Ok, the gun is completely finished now. Got some pics and damagepics, enjoy :
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Attachments
MB2² without barrel.jpg
The gun "naked" gun without a barrel, sprayed black and equiped with a steel stock
MB2² with shotgun barrel 26 mm.jpg
The gun with the "shot gun " barrel, shoots big marbles of 25 mm.
MB2² stock.jpg
Closup of the stock. This is made of 4 mm thick steel, heated, twisted, hammered and welded.
MB2² barrels.jpg
All the barrels I have right now. Notice the second barrel from the bottom, is a recycle of my MB1. these barrels are 15 mm, 18 mm, 22 mm, 28 mm, and a 1" galva dirt blaster
me and MB2².jpg
Me and the gun, to give you an idea how big it is. It holds very confortable, notice here the bipod is unmounted
MB2² 25 mm marbel at 110 psi1.jpg
I testfired three times at a thin wooden plate (4 mm) and a thicker plate (2 cm). Here the dammage at the first thin plate, nice round holes of 25 mm :)
MB2² 25 mm marbel at 110 psi2.jpg
the damage at the second plate. Notice the difference due to the use of (different) wadding behind the marble
MB2² 25 mm marbel at 110 psi3.jpg
Backside of the second wooden plate. Damage mainly caused by the third shot
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Unread postAuthor: CpTn_lAw » Tue Oct 17, 2006 12:22 pm

this .....is............mmh.......AWESOME!!!!!!!!!!!!!!!!!!!!!
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Unread postAuthor: Brian the brain » Tue Oct 17, 2006 12:31 pm

mm where did you get those 34 ( I think it should be 35??) fittings and pipe??


If I could get that I would defenitely redo the old sawed-off in 35 mm!!!!
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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: )DEMON( » Tue Oct 17, 2006 2:11 pm

Man!, that is really cool! I really love the stock, it gives the cannon such a threatening yet awsome look. :D
I think you should try make that as tough as possible, by renfocing the chambers. Great work :D
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Unread postAuthor: POS » Tue Oct 17, 2006 2:48 pm

Brian the brain wrote:mm where did you get those 34 ( I think it should be 35??) fittings and pipe??


If I could get that I would definitly redo the old sawed-off in 35 mm!!!!


I only fount it in 1 do-it-yourself-shop. It is 34 mm indeed. I bought reducer parts, from 34 to 28. At least I tought so. It was actualy 35 to 28 mm. So they didn't fit. I had to made them fit. I couldn't find endcaps eighter, so that's why there are reducer parts in the frontside of the chamber. The twe chambers are solderen together in front, but not connected like air-wise. The chambers are pretty stong, no wories about that

The stock is very strong to. I had much problems and had to work really hard to get the steel in this form.

I just tried a distance shot. I put up a target, a wooden plate (the second plate in the above pics) up to 25 meter, halfway my driveway. In front of it, I put the first plate from the pics above. I lied down at the door of the house, aimed for the top of the plate, cause the bullet always drop in his flight (I used a 25 mm marble) and shot the target at 8 bar. (110 psi) I didn't even hit teh first plate. The bullet only dropped a couple of centimeters, hitting directly on the second plate, en flew clear trough (nice round hole, and major damage on the backside. After I heard it hitting the wood, I heard a 'ting'-noice. The bullet flex further of course, hitting the steel gate. I went out to see if the gate was dammages, and unfortunaly it was. One of the vertical steel pipes had a dent in it. The gate was 50 meters away from the gun.

I was very pleased whit this performance 8)

Now I just need some sort of sight to get a bether aim.
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Last edited by POS on Wed Feb 18, 2009 3:45 pm, edited 1 time in total.
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Unread postAuthor: MrCrowley » Tue Oct 17, 2006 2:58 pm

wow that looks sweet :!: nice damage pics and i like what you did with the stock, is that a first in the spud-gunning world?
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Unread postAuthor: POS » Tue Oct 17, 2006 3:14 pm

Dont know, would be niuce though.

Got a question about the GGDT. The weight of the projectile is in "gm" What on earth is that ? I know mg (milligram), but that sure aint'it.

And does someone know the weight of a 25 mm marble ?
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Unread postAuthor: killagorrila99 » Wed Oct 18, 2006 1:14 am

Brian the brain wrote:mm where did you get those 34 ( I think it should be 35??) fittings and pipe??


If I could get that I would defenitely redo the old sawed-off in 35 mm!!!!



I can get 32mm Pipe, Thats what I used on the chamber for Heavy Artillery and the now compleated Hunting rifle.
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