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Lego technic mobile crane
This Lego technic mobile cran was one of my most timespending models. Six functions are operated by motors with the PF-system and one function is operated manually.
About this creation
General data

weight: +/_ 2 kg
top speed: 1 km/h
weight is converted on: 8 wheels
gear ratio: 1:2
steering system: the back and the front wheels are steering
driving system: one XL-motor powers the two axles in the middle via two differentials

First also some general photo's. This photo shows us the model from the front.


This photo shows us the superstructure. Notice the M-motor in the boom.


The "real" motor. This motor is also powered by the XL-motor that powers the model.


An overview of all the PF elements in the photo. Excuse me for the bad photo quality...


The lego technic mobile crane in it's natural environment. Here you really need four wheel drive!


Near the water, but not with a maximum extended boom.


text and photo's

The first function is the steering system. The M-motor is in the front, upright between the two receivers in the cabin. A long axle is directed to the back to power the steering system there. This can you see in the photo below.

In this photo you see the steering M-motor standing upright between twe two receivers.


The second funtion is the driving of the model by one XL motor. Consider it as a succes, because the model is heavy and it is only powered by one motor. I think the reason for this is the very short drivetrain.


The third function is the turning of the superstructure by one M-motor in the lower structure. In the video you can watch more of this. Because of the good balance of the superstructure, this M-motor's job is easier.


The fourth funtion is the operating of the winch by a M-motor in the super structure with gear reatio 2/3. The length of the wire is 3 meter.


One XL motor in the superstructure operates the fifth function, the raising and lowering of the boom by two new linear actuators. The boom is so heavy that in the beginning the raising is not fast, but later the raising speed becomes normal.



Another photo of the superstructure, from the bottom.


Last but not least, one M-motor in the boom makes it possible to lengthen the boom with 80%. This is needed to reach greater heights and to reach further.


Notice this detail photo from the top of the boom. The top is 5 studs thick!


The manual function is that of the outtriggers. First the boom to both sides is extended and then the mini linear actuators should be extended. More info about this actuator? Click this link . This proces can you watch in the video.


Another photo from the outrigger system. This was tricky, because I only had three studs and five in the middle because of the steering rear wheels. The outriggers had to extend far, so the transmission should bring the motion to the two sides.


video




Comments

 I made it 
  June 1, 2012
Yes, this article is a preview! In a few minutes, I will put some more photo's in the article. And what someone said about the outtriggers, you have a point: they are yes indeed not so solid, but for me they were essential for this model. So they are more for the look than for the stability of the model.
 I made it 
  June 1, 2012
Yes, this article is a preview! In a few minutes, I will put some more photo's in the article. And what someone said about the outtriggers, you have a point: they are yes indeed not so solid, but for me they were essential for this model. So they are more for the look than for the stability of the model.
 I made it 
  June 1, 2012
Yes, this article is a preview! In a few minutes, I will put some more photo's in the article. And what someone said about the outtriggers, you have a point: they are yes indeed not so solid, but for me they were essential for this model. So they are more for the look than for the stability of the model.
 I like it 
  June 1, 2012
Wow! There aren't that many Technic mobile cranes with multiple functions that look this great. Looking forward to seeing more photos of this challenging project!
 I like it 
  June 1, 2012
Nice crane, it looks fantastic, but please upload more photos! :)
 I like it 
  May 31, 2012
Sorry, that was an error on my part. I suppose that my thoughts on the steering were just because of the angle of the video. Nice crane, almost flawless.
 I made it 
  May 31, 2012
This article is a preview of the real page. I will explain more about it, when I have processed more photo's from it. I don't know how you invented that the back wheels are not steering, but in my version they did!
 I like it 
  May 31, 2012
It looks great. I like the engine. However, the functions do not work perfectly. The steering system appears to usually only steer the front wheels, due to the long axle twisting. My recommendation is to steer only the front four wheels. I would also recommend different stabilizers, as they look a bit unsteady. Mini LAs are not too strong (I have them too) and gear racks alone bend under pressure. Other than that, it's great! Most of the other functions work quite well.
 
By Kees Hogenhout
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Added May 31, 2012
 


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