Thursday, July 2, 2015

LEGO Technic 42042, Crawler Crane - Live Build Event (Streaming Now)

We are now broadcasting the LEGO Technic 42042 (Crawler Crane) Live Build Event on Google+ Hangouts On Air!
This is one of the upcoming 2H2015 LEGO Technic releases that you certainly won't want to miss...

We have enabled the Q&A application on Google+ Hangouts On Air, so you can enter your questions about this set at the event page. With this feature you can later jump directly into the video moment when we will be answering your specific questions.
Instead if you're willing to chat about this set with the TBs staff and others attending the Live Build Event, join our Google+ page and write down your thoughts there - please notice there is about 20-30s delay in the live broadcast stream.

Please avoid entering your questions by any other means like: TBs Facebook page, TBs YouTube page, comments into TBs posts or direct e-mail. As you might understand I'll hardly be able to spread my attention across these sources, while building this set with you.

During the building process I'll also occasionally do some interruptions to take a few photos, that will be used later for an offline TBs TechReview.

Another TBs Live Build Event. Enjoy!


Allanp said...

Thank you very much for these videos. The Arocs seems to have a huge amount of play value. It took a while just to demonstrate all the functions. Also can't think of another model with 7 motorised functions from one motor, and you've shown that they all work very well. Mastering the controls and becoming a "skilled operator" is going to be lots of fun. It's like with a computer racing game. If you are playing and the car moves on rails, you just have to press go, it's boring and has no play value. But make the game more challenging by removing the rails and leaving it up to the skill of the driver to get the vehicle to perform well, then the game suddenly becomes far better as well as more realistic. The pneumatic controls of the arocs are not hard to master and I think the need for some skill only adds to it's play value. And with it's live axles, suspension, new parts that open up lots of new possibilities and so on, the arocs is the new legend (8868/8880/8480) killer. 2H2015 has made me forget about 2H2014. love it :)

TechnicBRICKs said...

On my end I've mixed feelings about these pneumatics system...

The small pump takes sometime to creature the required pressure to make the more loaded cylinders to move. I think a larger pump is required or then a multi-pump design.
On the other end, cylinders under heavier load still collapse to fast. I think this could have a solution not in the cylinder itself, because they could have different uses, but there could be a special pneumatic T piece or even better a special pneumatic hose connector designed for much lower flux, which used in the right places could prevent such fast and dramatic movements. These could be also color coded for easier identification.

Of course one can train and learn to develop the right skill set to become a master in LEGO pneumatics operation... but even better if we can help the common kids to take the most of ther toys without needing to train for precision skils. :)

Allanp said...

Indeed I already know the first modification I will make to the Arocs is to upgrade the compressor to a multi pump design. Perhaps up to 4 pumps 90 degrees out of phase so that only one pump is under full load at a time to give 4 times the performance with not much extra load on the motor. It's a shame the Arocs din't come like this but I understand why it doesn't, it would be more expensive. And I agree that there could be improvements made to make lowering heavy things happen more smoothly. I think a logarithmically tapered valve response would work very well for this. It's not complicated, just a specifically shaped rubber seal inside the valve as opposed to the smile shaped moulded rubber O-ring. An example of how it would respond is as follows. Between 0 and 15 degrees of valve lever movement, the valve opens from 0% to 3%. Between 15 degrees and 30 degrees the valve opens from 3% to 30%. Between 30 and 45 degrees (45 being fully open) the valve opens from 30% to 100%. So it starts off very slow and precise to give you that fine control and then quickly in a logarithmic way increases flow to 100% as the lever moves to it's full position. I hope I explained that well :) For now (and for a very long time) I am glad they are investing in the pneumatic system so I do not want to seem ungrateful to TLG by suggesting still further improvements. I am very grateful to them and will be buying lots from them. But always things can be improved no matter how good it is. I don't know how much of a role if any my ramblings played in bringing us these pneumatics, perhaps I should continue rambling till we get better valves too XD

TechnicBRICKs said...


Indeed the logarithmic valve sounds like a great proposal also! :)

Mark Bellis said...

In the meantime, before we get more complex valves, this system of mine is capable of controlling LEGO pneumatics in an infinitely variable way:
In application to the Arocs truck, the main lift would be the first application. This would ideally have a position feedback flex through the centre of the turntable (if there is room between the hoses!)
It works similarly to some industrial hydraulics controls:
This is an area of growth for LEGO pneumatics technology so I may do some more experiments in due course.

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