Sariel Posted May 4, 2014 Posted May 4, 2014 This is not a completely normal video... Some more insan... erm, photos and reading: http://sariel.pl/201.../crawler-crane/ Quote
Rishab N Posted May 4, 2014 Posted May 4, 2014 WOW that is huge must be a pain to get all thhose boom pieces Quote
Hrafn Posted May 4, 2014 Posted May 4, 2014 What, no hamsters? Seriously, though, this is really neat. I like the extending tracks in particular. Not realistic per se but novel. Quote
Alasdair Ryan Posted May 4, 2014 Posted May 4, 2014 What, no hamsters? One of his hamsters died. Quote
Sariel Posted May 4, 2014 Author Posted May 4, 2014 (edited) I like the extending tracks in particular. Not realistic per se but novel. Actually, it's a real function found in real cranes: Edited May 4, 2014 by Sariel Quote
Mutant Orc Posted May 4, 2014 Posted May 4, 2014 Wow, must have taken ages to build!! I'm glad to see there is enough room after all the fishing rope, supports etc for a figure!! Now maybe you should build loads more construction vehicles and have that scene in the construction yard from the lego movie..! Quote
unimog123 Posted May 4, 2014 Posted May 4, 2014 Great job! Must of taken forever to put all that fishing string into the model. Quote
dhc6twinotter Posted May 4, 2014 Posted May 4, 2014 Very nice crane! I really like the functioning bucket. Awesome horse head too! Quote
Hrafn Posted May 4, 2014 Posted May 4, 2014 (edited) Actually, it's a real function found in real cranes: I stand corrected. Very cool! I'm sorry to hear about your hamster. Edited May 5, 2014 by Jim Removed image from quote Quote
captainmib Posted May 4, 2014 Posted May 4, 2014 Nice crane. Did you do any adjustments after the crashes? seems a pain to rebuild... How does the synchronise mechanism work for the claw? Quote
Milan Posted May 4, 2014 Posted May 4, 2014 (edited) I was afraid for those bottles of Jack when boom started to fall toward them, but it was ok :) Great job making boom strong and self-sustainable. That beams-spine holds them good. I read a lots about cranes, and its always impressive for me how such a high structure can holds itself together, not to mention lifting a huge load. High lattice cranes like this can even operate under some side wind, not strong winds, but still! It is even more impressive to make something like that with LEGO parts! Beautiful engineering! Edited May 4, 2014 by Milan Quote
paul_delahaye Posted May 4, 2014 Posted May 4, 2014 The bucket is cool, I just don't understand how it works :-) Quote
Sariel Posted May 4, 2014 Author Posted May 4, 2014 How does the synchronise mechanism work for the claw? There are two motors, one for lifting the bucket, one for opening it. They are connected through a differential so that the lifting motor controls both lines the bucket is suspended on, and the opening motor only one. There's a full explanation at my website. Quote
jantjeuh Posted May 4, 2014 Posted May 4, 2014 Not bad for a first try at a crawler crane, not bad at all! Knowing you though, there will be a far superior Mk.2 coming up some day ;-) P.S.: Sorry to hear about your hamster! He (she?) always did a great job at stress testing your creations. Quote
RohanBeckett Posted May 5, 2014 Posted May 5, 2014 Can you work out what the 'scale weight' of the objects you were trying to lift, were? ie: was the tub of butter equivalent to 200 tonnes? :) Quote
aeh5040 Posted May 5, 2014 Posted May 5, 2014 (edited) Wow, this is outstanding! A great example of what can be one by building smart and light rather than massive over-engineering (of course, that can be fun too!). Perhaps it would it be more manouverable and stable if the tracks were geared down more? Edited May 5, 2014 by aeh5040 Quote
DrJB Posted May 5, 2014 Posted May 5, 2014 Very nice. Seeing how the whole vehicle wobbles when moving/stopping ... I can't help but think of how it's done in real life. Maybe a control algorithm that optimizes trajectory/acceleration so as to minimize oscillation back/forth? Quote
dr_spock Posted May 5, 2014 Posted May 5, 2014 Very nice. Very nice. Seeing how the whole vehicle wobbles when moving/stopping ... I can't help but think of how it's done in real life. Maybe a control algorithm that optimizes trajectory/acceleration so as to minimize oscillation back/forth? Real life crawler cranes move very slowly on the tracks to avoid becoming unstable. Quote
Blakbird Posted May 5, 2014 Posted May 5, 2014 Real life crawler cranes move very slowly on the tracks to avoid becoming unstable. They also typically don't move while supporting any kind of load. If extra jibs are added, they are often not assembled until the crane is in place. Quote
Bricktrain Posted May 6, 2014 Posted May 6, 2014 They also typically don't move while supporting any kind of load. If extra jibs are added, they are often not assembled until the crane is in place. One of the reasons for using a crawler over a mobile is its ability to track with a suspended load. Quote
Milan Posted May 6, 2014 Posted May 6, 2014 One of the reasons for using a crawler over a mobile is its ability to track with a suspended load. Main reason for using crawler crane over mobile is cheaper rental rates for longer (bigger) operations-projects. The ability to drive with load is over exaggerated. Conditions must be perfect, boom must be locked dead straight-front, surface must be very flat, strong and clean (or special surface mats must be used), no winds... Quote
Blakbird Posted May 6, 2014 Posted May 6, 2014 Crawler cranes also have lower footprint pressure under load so they can operate on softer ground than wheeled cranes. Quote
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