Mini Liebherr LTM 1130 mobile crane (remote controlled)

[Tamas Juhasz]

Mobile cranes and small mocs are two from my favourite themes, so I decided to build a moc which fits to both. In the case of mobile cranes a small moc is only small compared to 81,6 or 94,8 (or even PP) wheeled cranes. I chose the Liebherr LTM 1130 five axle crane to build a full RC one:

http://www.brickshel...ry.cgi?f=514492

Scale is 1:31, the main aims were: keep proportionate, and to be full RC with the 9 functions. I had to economize with the space, to put in this crane 6 M motors, one 9V motor, 3 conversion wire, one AAA battery box, 4 receivers and more. I haven't thought that the hardest part will be the turntable driving in the building process. Finally, a belt drive was built in with 90° rotated axles, there were space only for that because of the other construction elements. But as can be seen below in the video it works fine.

The outriggers mechanism was also tricky. One M motor operates the four legs, in extension process the red rubber band extends the outrigger, then the M motor pulls them back with the string and winds up the rubber band: http://www.brickshel...LTM1130/040.jpg

The legs are only for working, they don't support anything. This isn't problem, because the crane can't fall over, it's own weight stabilize it in the case of 50-100 g weight in the hook. With one motor for two functions(outriggers in out - legs up/down) can be save one receiver output, I used that for the front led lights:

http://www.brickshel...y.cgi?i=5634921

The nine functions: Driving, steering, outriggers in/out, legs up/down, boom lifting, boom extension, superstructure rotation(fortunately can be in 360°), hook lifting, front lights. There is a very limited space inside, so many functions are driven with rubber bands.

I used 43 mm wheels. Main dimensions:

length: 487 mm

width: 114 mm (95 in the body)

height: 128 mm (top of the boom)

max. height: 654 mm

weight: 1636 g (with batteries)

speed: 0,2 km/h

number of pieces: 1500

Max boom length: http://www.brickshel...y.cgi?i=5634874

Max. height: http://www.brickshel...y.cgi?i=5634875

The crane needs a flat surface to move, the ground clearance is ~ 1 mm to save space inside. Has a differential in the driven axle:

Four of the five axles can be steered:

http://www.brickshel...y.cgi?i=5634857

http://www.brickshel...y.cgi?i=5634858

The battery is placed in the front, and two receivers are sitting in the cab instead of the driver :

http://www.brickshel...y.cgi?i=5634943

I wanted a dashboard too:

The superstructure contains 3 motors, the actuators, covering, and the crane operator cabin. This cabin was the hardest part in the superstructure:

Here can be seen in action:

Edited October 11, 2012 by Mbmc

[jorgeopesi]

I saw on you tube a few days ago great MOC again.

[PsyKater]

Wow, it's so clean and small AND has so many features. Just perfect!

[Alasdair Ryan]

Very good crane,could you make some sort of instructions for the legs?

Edited October 11, 2012 by Alasdair Ryan

[drdesignz]

Fantastic design! Mobile cranes are some of my favorites also. In fact, the 8053 is what got me back into Lego after twenty years.

[dr_spock]

Excellent work. Looks like it would fits nicely in a mini-fig city layout.

[07jkearney]

Fantastic! Really tiny. :thumbup:

[hrontos]

Excelent creation. So many functions in such compact and clean design. It would really nicely fit even into city scale. I wonder where all those wires (6 motors, receivers...).

Edited October 11, 2012 by hrontos

[Tamas Juhasz]

Thanks. The wires caused a lot of problem in the end of building, but after some modification they could be put mostly in the drivers cab and near to the turntable. In the middle there is a little "empty" space.

Very good crane,could you make some sort of instructions for the legs?

Actually I made the whole instruction for this moc, there can be seen the outriggers mechanism. I can upload when I have time.

[Zerobricks]

Great work there! One question, the outriggers dont really support model, do they?

[Strikeman]

This crane is fantastic ! The details, and especially the leg mechanism is very clear

Zblj, they don't support the model indeed.

The legs are only for working, they don't support anything. This isn't problem, because the crane can't fall over, it's own weight stabilize it in the case of 50-100 g weight in the hook.

Edited October 11, 2012 by Strikeman

[Tamas Juhasz]

Thanks for answer, that's the situation. I wanted the working outrigger, but didn't see possibility to make them functionable. With the small pneumatic cylinder it would be bigger and that would require also a compressor.

Edited October 12, 2012 by Mbmc

[timslegos]

Awesome crane! The build is so compact and clean. the outrigger technique is great.

tim