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[MOC] Lego Liebherr LTM11200
Jeroen Ottens posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi, I would like to present to you my latest MOC. It is a scale model of the 9 axle Liebherr LTM11200 telescopic crane. It is fully remotely controlled using all 8 channels of the Lego RC system to control 20 (!) functions. The truck contains 7 functions with 4 motors (1 XL, 3 M) and 2 IR units: 1) Drive (and engage the 8 cilinder fake engine) 2) Steer 3) Switch between crab steering & normal steering (with ackerman geometry) 4) Rotate outriggers outwards 5) Extend outriggers 6) Lower outriggers 7) Switch between 1,2,3 and 4,5,6 (just like 8043 switching) The superstructure contains 13 functions with 4 motors (1 XL, 3 M) and 2 IR units: 1) Spread guying arms on boom 2) Raise boom 3) Raise contraweight 4) Extend boom (4 sections) 5) Rotate superstructure 6) Raise guying arms on boom 7) Rotate operator cab back to front 8) Raise operator cab 9) Tilt operator cab 10) Cable drum 1 11) Cable drum 2 12) Rotate and extend optional legs on boom 13) Switch between 1,2,3 and 4,5,6 and 7,8,9 and 10,11,12 (using a nifty mechanism to engage only 3 functions at a time, thus enabling 4x3=12 functions with only 3 motors) The boom is detachable by pulling out 4 axles. In theory it can than stand on its own legs (function 12) and the truck can drive under it. The superstructure is also detachable by pulling out 4 axles. Aproximate piece count so far is ~6000 pieces. Here is an image of the gearbox of the superstructure: And here is an image of the underside: The green lines indicate where the gearracks are located. Each axle has a 13L gear rack at the front side and a second 7L gear rack at variable distances at the backside. One long axle with multiple 12T gears on it can be moved 2 studs. This way either the front racks are engaged (crab steering) or the back racks are engaged (normal steering). A mechanical lock is used to ensure that the switching movement is only possible when the axles are at 0 degree turning. However, the sad part is that a some functions do not work . Lifiting the boom is impossible due to the weight. Rotation is impossible with the Lego turntable that I used. Functions that do not work, but that can be fixed: all outrigger functions (I need to reduce the play in the gear train at some critical points, but that seems to be doable). the switching mechanism in the truck (it works, but it is not foolproof) the steering needs to be geared down Giving the fact that I'm pretty sure that I can't solve the boom raise issue I wonder whether or not it makes sense to go through another design iteration to solve the other issues or that I should leave it at this. What is your opinion? Jeroen