Machinegun with functioning ammo belt, the LMG 66 ( Lego Maschinen Gewehr 66 ) Shoots rubber arrows. Works like real gun. Inspired by MG42
About this creation
I had these lego cannons and was wondering how to shoot them more than one at a time.
And I only have 10 fingers... I tried to create all kinds of fixed cannon systems,
but they werenīt so good.
But then I noticed that the new cannon ( 57029 flat bottom ) has space enough under it for technic beams, which the older version ( 32074 round bottom ) did not have.
I build various kinds of belts from technic beams, but they all failed.
But one day I was watching a video of a lego caterpillar and noticed that treads
( 57518 link tread wide ) have standard holes in them. I realized that those cannons
can be connected on those tread holes. So I built a real shooting belt.
Belt of 75 shots did cost around 50 euros, a reasonable price for having fun.
Special thanks to realpink from Bricklink for those cannons!
Next thing was to create something to run that belt and shoot those arrows.
Something like MG42 ..
After 665 trials I finally came up with this version. Biggest problems were with reliability, gun jamming and breaking. Gearbox was exploding time to time, loose
If an arrow stopped in the barrel, it was stuck with next arrows in a split of a second.
But now, after 10000+ test shots, itīs working quite alright.
The belt drive is made of 2 small drive wheels ( 57520 ), synchronized with gears.
In and out guiding rollers were added to make the belt flow smooth.
It is powered with an XL-motor and, having a 4-speed gearbox, yes, it is the worldīs
first machine gun with gearbox. You can even change gear during shooting.
Triggering arrows is very simple, a technic cam 6575 works as a wedge that pushes
cannon trigger backward. You can see on top of gun the trigger adjuster.
1. gear is for loading the belt to gun.
2. gear is for economy shooting
3. gear is for normal shooting
4. gear is the TURBO for maximum destruction ;)
Gear ratios: ( fresh battery )
1. = 0.33, about 3 shots/second
2. = 0.55, about 6 shots/second
3. = 1.00, about 10 shots/second
4. = 1.67, about 15 shots/second, makes about 900 rpm, good machinegun speed.
The fourth gear was filmed with a video camera and every frame was checked to see
how long it took to shoot 10 shots. Fresh batteries and a belt of 10 was used.
With a shooting distance of 20cm, up to 3 arrows was seen flying at the same time.
Loading a full belt of 75 takes 2 minutes and shooting it takes under 10 seconds.
Meaning that 95% of my time is just loading the belt. And finding all those arrows around the room.
My loading record is 90 arrows in 120 secs, but I would be happy to see someone else to do the loading ;).
One arrow unit is 1 inch width, so a belt with 90 arrows is 2.25 meters long!
Normally I have belts of 25 and 50 in use.
Everybody who tried this gun has laughed a lot ;)
Please do not take this weapon too seriously !
This is so far just an experimental weapon, but it looks and sounds pretty real.
A belt unit is made of these pieces:
57028c01 Technic Competition Arrow x 1
57029 Technic Competition Cannon, Flat Bottom x 1
57518 Technic, Link Tread Wide with Two Pin Holes x 2
6536 Technic, Axle and Pin Connector Perpendicular x 2
32062 Technic, Axle 2 Notched x 2
32002 Technic, Pin 3/4 x 2
Guiding-piece and few arrows
Gearbox seen here
Trigger, Technic cam (yellow) seen here. nothing movable !!
Snapshot from LDD-file
And a mod to gun, see that yellow little roller, makes belt running better ;)