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Lego Brick Machine Gun?
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 Group moderator 
I am asking for everyone's help on this one. I have only seen like 3 really good mechanisms for a Lego Brick firing machine gun. I have always wanted to make a machine gun WITHOUT having to load the bands too. Just put the clip in and shoot! That is all I have wanted, but there seems to be no good mechanisms for it. So if you guys have good ideas please let me know!
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| August 10, 2009, 1:00 pm
here this is the only decent one i have found that doesnt require modification of the pieces:
http://www.youtube.com/watch?v=sfJg2L1i3sM
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| August 10, 2009, 1:11 pm
 Group moderator 
Do you mean a gun like every normal gun: Just press the trigger and fire? Else, I know a pretty good mechanism, wich has the same function as your first brich shooting machinegun. Just make the clip removeable, and give it more power. Is it a good idea?
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| August 10, 2009, 1:28 pm
Quoting head shot
here this is the only decent one i have found that doesnt require modification of the pieces:
http://www.youtube.com/watch?v=sfJg2L1i3sM

dude i built an exact replica of this gun, it works great, but there is almost no power, and it cant be built into a gun shape. trust me on this
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| August 10, 2009, 2:29 pm
 Group moderator 
Most great machine guns I know use rubber bands. That is great but you have to load both the rubber bands AND the clip. I hate that so much! I want a mechanism that all you have to load is the ammo, and no rubber bands. Now I did make a machine gun like this, the (W-96). I am working on modifying the same prinicpals on that gun to make a better machine gun. But the problem with that gun, is that the crank had so much pressure, it was hard to even hold onto it! Anyway I am going to work on that as like a research project.
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| August 10, 2009, 3:02 pm
 Group moderator 
My ultimate goal would be something like Tom Jongejans is saying. Just pulling a trigger and BOOM! A stream of bricks comes out. Now that sounds far fetched but with a cordless drill that may be possible. I will continue to look into this..... I may need to make my own mechanism for this too. Which is VERY time consuming.
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| August 10, 2009, 3:06 pm
 Group moderator 
Ok, I just made a new version of my (W-96). I improved the handle which used to twist off easily. Also, the mechanism is fully inclosed so it looks good. There is also a stock I added to help with holding it. Cause I hate how the gun likes to jump around in your hands!
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| August 11, 2009, 10:54 am
 Group moderator 
The key to a great machine gun is the timing of pulling this firing pin back and letting it go all in a constant motion. But also the power on something like this would be very low. Now I have been thinking of maybe cheating on this. What if you make a gun, regular design with the rubber bands shooting the rounds out. BUT have another replaceable barrel for it. Then with a 2 man crew you could have 1 loading and another firing. That would be a crew served machine gun. And it could be mounted on a tripod or something.
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| August 11, 2009, 3:41 pm
 Group moderator 
Quoting Weston Wedeward
The key to a great machine gun is the timing of pulling this firing pin back and letting it go all in a constant motion. But also the power on something like this would be very low. Now I have been thinking of maybe cheating on this. What if you make a gun, regular design with the rubber bands shooting the rounds out. BUT have another replaceable barrel for it. Then with a 2 man crew you could have 1 loading and another firing. That would be a crew served machine gun. And it could be mounted on a tripod or something.

Than, you need to remove the magazine too, if I untherstand it in the right way?

I love the idea. Actually just like areal machine gun: Change the barrel when it's overheated. But now, it isn't overheated, it's "Overshot" =D!
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| August 11, 2009, 4:02 pm
i figured out how to make one. the needle in a tattoo gun moves up and down right? so take the mechanism in that and convert it to lego (you can do this i have done it before), turn it horizontal and attach it to a mechanism similar to Thomas coopers. the block with the firing pin (mod of thomas' mec) will move back and forth pushing out the rounds. the rounds will be the kind that me and Max S have made. so when the firing pin moves forward it sets off the cartridges and the spent cartridges will get ejected out of the ejection port and a new one will rise into the chamber. so this mec is basically a heavily modded thomas cooper gun.
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| August 11, 2009, 8:56 pm
 Group moderator 
Quoting head shot
i figured out how to make one. the needle in a tattoo gun moves up and down right? so take the mechanism in that and convert it to lego (you can do this i have done it before), turn it horizontal and attach it to a mechanism similar to Thomas coopers. the block with the firing pin (mod of thomas' mec) will move back and forth pushing out the rounds. the rounds will be the kind that me and Max S have made. so when the firing pin moves forward it sets off the cartridges and the spent cartridges will get ejected out of the ejection port and a new one will rise into the chamber. so this mec is basically a heavily modded thomas cooper gun.
I'm not exactly sure how that will work other than the automatic back and forth action. How much force will be behind each round? What is the deceleration of the motor as it reverses direction? In other words, does it jerk back and forth or does it slow down a little before reversing direction?

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| August 12, 2009, 12:24 am
 Group moderator 
Yes, using a Lego motor is highly umpractical due to the stress you would be putting on it. That is why I have been testing models out with a cordless drill. It has the perfect trigger and you know its very strong.... the thing has to screw in those screws! The bolt idea sounds great but very complicated. The only way anyone has really ever done this is by cutting some gear teeth off a gear. And haveing that flat gear thing.
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| August 12, 2009, 11:14 am
Oh my goodness I have an idea! You could make a mechanizm similar to an airsoft gun. You could modify a gear so that only some of it has gears. The electric motor has the gear on it. You would make a piston with a flat 1/4 piece with gears teeth. The part of the vgear with teeth would pull the piston back (spring behind piston) and when the gear gets to the part with no teeth, the piston is released and the spring pushes the bullet out, and the whole process starts over again.
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| August 12, 2009, 12:19 pm
This is a good explination: http://en.wikipedia.org/wiki/File:AEG.gif
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| August 12, 2009, 12:23 pm
Quoting Max S.
One thing you must think about: Could you get a lego motor strong enough for pulling the firing pin strong enough? I had the same idea before, and I didnīt make a gun using this kind of mech because I came to the decision that the motor wouldnīt be strong enough to do this, even by the use of gear wheels. Because I think you want to have a really high rate of fire, but I also donīt belive youīll get it with this. Oh and btw, you wrote my name false.
IīLL NEVER FORGIVE YOU THIS MISTAKE!!!
(well, a little joke ;)

you dont understand how it works. it uses a piston effect to move the firing pin back and forth. when the firing pin is in the forward position it will compress the pin in the back of the cartridge causing it to fire. when the firing pin is pulled away the empty cartridge will eject and a new one will rise into the chamber.
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| August 12, 2009, 12:27 pm
Weston, why dont you copy my full auto electric brickshooter, and add some sort of magazine release mech? because apart from the fact that you cant change the magazine, its exactly what you wanted (but you may also have to up the power a bit, as the range isnt great (for me XD))
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| August 12, 2009, 12:28 pm
Quoting PyBrick Replicas
Quoting head shot
i figured out how to make one. the needle in a tattoo gun moves up and down right? so take the mechanism in that and convert it to lego (you can do this i have done it before), turn it horizontal and attach it to a mechanism similar to Thomas coopers. the block with the firing pin (mod of thomas' mec) will move back and forth pushing out the rounds. the rounds will be the kind that me and Max S have made. so when the firing pin moves forward it sets off the cartridges and the spent cartridges will get ejected out of the ejection port and a new one will rise into the chamber. so this mec is basically a heavily modded thomas cooper gun.
I'm not exactly sure how that will work other than the automatic back and forth action. How much force will be behind each round? What is the deceleration of the motor as it reverses direction? In other words, does it jerk back and forth or does it slow down a little before reversing direction?

the motor would not slow down as it goes back because for that you would have to use mindstorms which are just too bulky. so yes it would jerk back and forth creating "recoil"
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| August 12, 2009, 12:30 pm
Quoting Weston Wedeward
Yes, using a Lego motor is highly umpractical due to the stress you would be putting on it. That is why I have been testing models out with a cordless drill. It has the perfect trigger and you know its very strong.... the thing has to screw in those screws! The bolt idea sounds great but very complicated. The only way anyone has really ever done this is by cutting some gear teeth off a gear. And haveing that flat gear thing.

the idea i have is simple. it would probably make the gun long but simple. i will post a prototype with a video when i get it working.
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| August 12, 2009, 12:34 pm
nvm my idea. i doesnt work
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| August 12, 2009, 1:07 pm
Quoting Max S.
I understand it, believe me. But I donīt think it will work. Trust me, I thought about many many different firing mechīs, and that kind you explained was also one of them. I only use firing mechs, when Iīm totally sure it will work. Of course I make only small parts of guns including only the firing mech and a magazine to test them, but only on this designs Iīm sure theyīll work. My thoughts about a brick firing pistol is one of them. I tried to fit the mech into a luger P08, but unfortunately I havenīt got enough bricks of some sorts to build it full scaled. The theory of the mech itself is pretty good and very good working, so I decided to put it maybe in another gun. But what I wanted to say, is, that you should only build guns or gun prototypes for firing mechs youīre sure theyīll work perfect. In my opinion all other actions are waste of time, because when it donīt works you build this model for nothing. Donīt be angry about this, I only wanted to show you what I think about this and what I think about the idea for this mech. Itīs good to think about copying real rifle mechs for lego guns or airsoft rifle mechs for lego guns, but if you do this, you must be sure that it will work.
Greetings, Max S.

no you are right. i think about what i build before i build it but half the time when i build it it doesnt work and this turned out to be one didnt work, as i just found out.
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| August 12, 2009, 2:46 pm
 Group moderator 
What is this? Some sorta epic drama about a Lego machine gun mech? Lol! Anyway, I have been thinking off dropping the project, cause I don't have that many parts. My W-89 takes up most of my orignal good parts. Don't worry though, I will keep thinking on this. :)
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| August 13, 2009, 12:36 am
yesssss
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| August 13, 2009, 11:49 am
okaaayyy...
guys, if you really are stuck, do try the revolving cylinder idea. it really does work well, you just cant make the gun look like a gun...
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| August 13, 2009, 12:10 pm
Quoting Jack Streat
okaaayyy...
guys, if you really are stuck, do try the revolving cylinder idea. it really does work well, you just cant make the gun look like a gun...

when are you going to come out with another gun?
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| August 13, 2009, 12:54 pm
Quoting head shot
when are you going to come out with another gun?

today. just wait a couple of hours and itll be up. if not then tomorrow. SNEAK PEEK: its a UMP 45!
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| August 14, 2009, 7:41 am
 Group moderator 
Quoting Jack Streat
today. just wait a couple of hours and itll be up. if not then tomorrow. SNEAK PEEK: its a UMP 45!

Haha, one of my favourite guns by Heckler und Koch!
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| August 14, 2009, 7:46 am
Quoting Weston Wedeward
The key to a great machine gun is the timing of pulling this firing pin back and letting it go all in a constant motion. But also the power on something like this would be very low. Now I have been thinking of maybe cheating on this. What if you make a gun, regular design with the rubber bands shooting the rounds out. BUT have another replaceable barrel for it. Then with a 2 man crew you could have 1 loading and another firing. That would be a crew served machine gun. And it could be mounted on a tripod or something.



I think I'm gonna try that one!
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| August 15, 2009, 5:23 pm
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