Here is the second post about my current project (or more accurately one of my current projects), the full RC Liebherr LTM11200 crane. It is the superstructure:
This superstructure is packed with functions, 13 in total. All are RC, but only 4 motors are used. Combined with the 4 motors of the carrier this gives a total of 8 motors for the entire vehicle. And that is exactly the number of motors that can be individually controlled with the LEGO Power functions system.
In the center of the structure a big gearbox is used to switch between 4 groups of 3 functions each. Just as in the carrier each function is colourcoded in either red, yellow or black. Red is coupled to the XL motor and is used for the heavy jobs, like lifting the boom and rotating the superstructure, whereas yellow and black are coupled to L-motors. The switching is done with a M-motor.
The grouping is as follows:
- Group 1
- Yellow: Rotating the arm of the cabin
- Black: Raising and lowering the cabin
- Red: Tilting the cabin
- Group 2
- Yellow: Winch 1
- Black: Winch 2
- Red: Boom function 1 (which will be extending the boom. This way it is possible to extend the boom and wind down the winches at the same time)
- Group 3
- Yellow: Boom function 2
- Black: Boom function 3
- Red: Rotate the superstructure
- Group 4
- Yellow: Boom function 4
- Black: Raising and lowering the counterweight
- Red: Raising and lowering the boom
The superstructure also has one manual function, namely opening the cabin with a slidedoor.
As with the carrier a lot of attention has gone into the structural integrity of the build. The whole structure is formlocked where possible and longitudual beams are running along the bottom and topside to guide the forces towards the mounting with the carrier. As you can see in the video I used a brickbuilt rollerbearing for maximum support of the superstructure.
I made a short video to showcase all the functions:
And here is a final shot of the superstructure mounted onto the carrier in limited weight transportmode:
That’s it for now.