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Deathray Marble Machine 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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Have I finally topped the sawed-off

Yes!!!
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well...YES!!
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I don´t like full auto guns that can shoot through guitars
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Total votes : 46
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Deathray Marble Machine Gun

Unread postAuthor: Brian the brain » Thu Dec 20, 2007 5:00 pm

Here is a preview to my current project.
I finally obtained a QEV and was eagre (sp??) to try out the QEV-safety pop-off principle to achieve full auto in a marble gun.

Boy does that work!!
I currently use a small chamber, because I still have to get a CO2 refill and now pump up the bottle with my trackpump to test the principle.Therefore I need to reduce gas consumption to the minimum for now.As it is, I can only fill the bottle to give me 5 full auto shots at the required 11 bar.I like the fact it doesn't give weak shots as the tank empties.It just stops.Very clean..BANG-BANG-BANG-BANG-BANG.Then silence..I love it!!

I have been tinkering with the pop-off to achieve higher pressures than it's set 11 bar, so far I can only get it to go up to 13 bar.I'll work on it some more coming week.I want 16 bar minimum, rather 20 if possible.


The bolt is a "regular" blow forward bolt with some additions.
I'll explain that with some pictures.
The bolt ensures a no more than one marble can ( ever) be loaded at a time and it prevents the marble from rolling out.It works 100%.
When the bolt is moved forward the marble is released.

I didn't want to use a paddle and I also dislike the idea of "blocking" marbles with an O-ring or a smere of silicone or whatnot.
All of those use friction and friction means wear and redoing.
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Attachments
uberkillshortbastard.JPG
I had to use the pilot pressure washer handle for the MMG, so this meant Overkill had to be adapted.
I kinda like the short look.( long barrel is still optional)
loadslugcuttershell.JPG
Here it's loaded with a slugcutter shell.Now I can shoot both spuds and golfballs as both fit the shells perfectly.
loadwithshells.JPG
Opened breakbarrel breech. Inside you can see the golfball sized barrel tube wich keeps the shells in place.This beats muzzle loading I tell ya!!
breakopenm79like.JPG
The MMG uses parts of Overkill, wich therefore needed a rebuild/update.It now features a new exaust valve ( blowgun) and a break barrel.Can you say M-79?!?!
I configured it ultra compact, for easy consea-...I mean storage
muzzlelookscool.JPG
One thing that does look good already is this muzzlebreak.It was part of a pneumatic nailgun I failed to convert.As punishment I ripped it's guts out and stuck it on the muzzle hahaha..It is actually the most useless addition I have ever made to a gun, but it looks the part..
asifassembled.JPG
This is about how it will look.Well..ofcourse I will paint most parts silky black.( what happened to flat black all over..I must be getting soft with age)
epoxyhandlewithbottle.JPG
Direct CO2 injection.Handle has been shaped to fit perfectly.Too bad it's too cold out there for the glue to work.Direct CO2 forms no problem as the system is triggered by the safety valve.
open breech.JPG
The breech wich makes high rpm at high pressures possible without jams.popopopopoppoppop! too fast to see...
bloodymess.JPG
So here's my messy workspace.But if a messy workspace implies a messy mind, what does an empty workspace imply?!?Anyway..I still need to clean up the look, paint the gun and up the power on the MMG.Where the fff did I put my tools?!?!
blockerbolt.JPG
THe "blockerbolt" is fixed to the tube in wich the blow forward bolt slides.In other words; it doesn't move, only the blow forward bolt does.It runs through a slot in the bottom.As the bolt is moved forward the marbles roll off the blocker and drops in line with the barrel to be fired.The hole in the top of the B.F., bolt provides the nessecary space for this action to work.The blocker also inhibits the blow forward bolt from turning, wich would mis aline the "drop-in"hole at the top of the B.F. bolt.

The back end of the B.F. bolt is a bit narrower in real life, wich also prevents the marble from roling back.All this ensures clean full auto bolt action without misfires of roll-outs
Now I gotta go listen to Bad English...Jesurs!!some of the most basic things can be hard to explain if English isn't your first language..
Closeupcompleted.JPG
And because most people are not interested in reading the entire thread, here is a picture of the completed MMG
Last edited by Brian the brain on Sun Jan 13, 2008 11:24 am, edited 4 times in total.
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: LikimysCrotchus5 » Thu Dec 20, 2007 5:35 pm

Sounds interesting, destructive, and creative (messy minds tend to be creative :) )

Well, at least you have a general workshop. I just use my garage and i dont have too many tools. But i have all that is needed to make a cannon. Well i am curious to see a video. :wink:

EDIT: Wow BBMGs with semi auto and full auto are really popular on the website recently. :cheese: (random Smily)
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Last edited by LikimysCrotchus5 on Thu Dec 20, 2007 5:38 pm, edited 1 time in total.
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Unread postAuthor: mopherman » Thu Dec 20, 2007 5:36 pm

wow, looks great. I'm afraid I dont get how the marbles can slip past the bolt though... what did you put on the pressure washer handle? bondo?
BTW, Is that the Ye olde' pirate pistol under the overkill in the last pic?
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Unread postAuthor: Brian the brain » Thu Dec 20, 2007 5:50 pm

THe top hole in the blow forward bolt provides just enough space for the marble to...well..be.. as the bolt travels forward.Without that entry hole in the top the marble would be unable to pass the blocker.
THe pirate pistol has been sent to Davy Jones locker I'm afraid...
What you see is nothing more than a random piece of left over pipe and fittings..

Oh and yes, I believe that is what you guys call bondo.
Body filler if you will.

Yeah, I'm glad to see some things happening again.Idea's like these can spawn other idea's in other people and the ball starts to roll as we Dutch say.
I learned tonight that an old random idea of mine has resulted in the birth of piston hybrids...Although I can't really take credit for it because I never even tried it myself.

Anyway.I'm glad with what I have achieved so far.I'll tinker with it some more and clean up the look..I just love that clean sound..
I invite anyone that has a QEV and a pop-off to try this.It's really cool
( oh and the qev-pop-off thing was NOT my idea!!)
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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: rna_duelers » Thu Dec 20, 2007 6:02 pm

I love the break open barrel,and the black goes well with it.Any chance of some damage pictures/videos?
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 21, 2007 12:12 am

glad you're getting better results than I am, looking forward to seeing this in action :)
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Unread postAuthor: Brian the brain » Fri Dec 21, 2007 12:33 am

When I get around to it.I'm always more interested in getting it to work, building, designing etc than I am in the actual shooting it part...
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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: POLAND_SPUD » Fri Dec 21, 2007 12:35 am

I am impressed... :D can't wait to see some dammage pics/videos....
or at least more schematics & blueprints
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 21, 2007 12:47 am

Brian the brain wrote:When I get around to it.I'm always more interested in getting it to work, building, designing etc than I am in the actual shooting it part...


Clearly you don't work with epoxy :roll:

I do enjoy building, but the proof of the pudding is in the eating, so it's great to see your efforts come to life.

Very ingenious bolt design by the way, I like :)
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Unread postAuthor: Brian the brain » Fri Dec 21, 2007 4:15 pm

Proof of the spudding is in the beating indeed.
I'll beat some stuff up with it when I think it's ready for it.

I can only record soundless vids..and I forgot how to post them..( only tried that once..)

I would like to know how to make those animations some guys use...
that way I could make a nice bolt animation wich would be easier to understand..
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Attachments
epoxyputty1.JPG
epoxyputty2.JPG
Clearly I do work with epoxy..
blockerboltvisual.JPG
I think this visual explanation is easier to understand ( and more complete
Last edited by Brian the brain on Fri Dec 21, 2007 4:45 pm, edited 1 time in total.
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: MrCrowley » Fri Dec 21, 2007 4:41 pm

Brian the brain wrote:I would like to know how to make those animations some guys use...
that way I could make a nice bolt animation wich would be easier to understand..


I use Macromedia Flash MX, you probably can download a trial and *cough* crack it *cough* :wink:
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Unread postAuthor: LikimysCrotchus5 » Fri Dec 21, 2007 5:33 pm

Actually instead of *cough*cracking*cough, sneeze, fart, burp*( :D ), you can download a version of it with a crack and just follow the instructions.

PM me is help needed
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4SPC, My 4" piston 3" porting cannon
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Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
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Unread postAuthor: Fnord » Fri Dec 21, 2007 7:44 pm

I can only record soundless vids..and I forgot how to post them..( only tried that once..)


Well, most people just make a youtube account and upload videos there.

I can't wait to see a video of this thing. Once it's painted you should add a detachable laser sight (it would just be wrong not to add one on such a gun:).

w00t.
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Unread postAuthor: Brian the brain » Sat Dec 22, 2007 1:19 pm

The two laser sights I have now are from airsoft guns...not very sturdy or accurate.
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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: Brian the brain » Thu Dec 27, 2007 6:21 pm

Still working on it.I managed to mod a safety pop-off.I tapped the hole that is normally kept shut by the piston thingy, and screwed in a 1/8 fitting.
THe goal was to make a smaller surface area for the pressure to work on.( I reduced the hole size so to say). :roll:
THis makes higher pressures possible.I'm aiming for 16-23 bar..somewhere along those lines.. :D


I reconfigured the gun to be more bullpup like, so without chopping the barrel, the gun is now much shorter.I used brackets to hold the barrel to the blowgun.glue kept coming loose wich in hindsight is a god thing because I would not have been able to change it.
..and I found out that socks make excellent cheap-o bottle covers.
I redid the chamber and found a better way of connecting it.It is now tucked away nicely.
THe temporary marble hopper will be replaced by a proper sports-drink bottle.I painted some parts before I changed all of this so it still looks unfinished
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Attachments
workingparts.JPG
These parts make the gun capable of doing full auto.Leave a comment if you like.
thatllhold.JPG
better way of attaching the barrel to the body.Looks nice I'd say
MMGexplained.JPG
New look.It just all came together and it feels like this is the way to go.Sometimes nothing seems to work, but this time everything seems to fall into place, just like it did on the sawed-off!
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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