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Cranes on the brain
** I apologize up front for what looks like a redundant post. This post was meant primarily for a video. However, it appears that mocpages has changed its policy once again, and now is not allowing applets. Therefore one cannot post youtube vids, at least not to my knowledge. First iframes and now no applets, what next?? So for now, embedding the videos by hyperlink is the only way to view the vids I discuss here. Please view vids for complete information and reason for the post. If anyone knows a way around this, please PM me or post it on this post. Truly, the reason for this post was to show a success over a previous failure, best demonstrated by video. **
About this creation
Euroricks.com is having a crane competition, and well, that got me playing with the model I made a year or so ago. I love cranes, I think their concept is so prehistoric, just a bunch of cables holding everything up. Sometimes I think all the cables, lines, pulleys and winches almost look Rube Goldberg-like; except, unlike a Rube Goldberg machine all the fanfare is completely functional. Cranes can lift thousands of tons, all with physics, cables, pulleys, and the like.


Here is my model (previous versions can be found perusing my pages), but I redid the Y-guy arrangement so it is more accurate and stronger. About a year ago I tried to lift the 8070 supercar (my version, which is a little heavier at 1433 grams), and failed. RebrickableLEGO (youtube) tried as well but also failed (ultimately they did with their actuators, which is NOT how cranes work). First two attempts, RebrickableLEGO’s and mine, are here

And here

Well, I am too stubborn. All this crane talk got me re-interested, and I was bound and determined to make the lift. Installed a large motor (used to have M PF motor) and more pulleys. The pulleys are true pulleys. Funny, on Bricklink.com these are called pulleys, but the main benefit of pulleys lies in their multiplicity. Really, you can’t add lots of these pieces to increase lifting ability because they have to move independent of each other, which they cannot do when all linked by an axle.



A true pulley looks like those available on shapeways.com by Efferman.



Check out the video, lifted the 8070 supercar just fine.




Here are some pics of the crane lifting other things…..cranes are awesome!



Kinda reminds me of:







The improved “Y guy” arrangement allowed me to lift things to great heights even with the boom completely extended.













Thanks for looking and remember to rate and comment!








Comments

 I like it 
  August 14, 2016
Fantastic work!
 I like it 
  March 10, 2016
Already told you on EB: great build, excellent!!! It is massive and strong as well... Good job!!! :-)
 I like it 
  October 29, 2015
That's big.
 I like it 
  October 25, 2015
Yep, cranes do that to you :-). Brilliant post!
 I like it 
  October 15, 2015
Good demonstration of the fundamentals of block and tackle design -- especially the need to decouple the individual sheaves (pulley wheels). The most important parameter is the total number of cables N supporting the moving (here, lower) block. When 1 cable connects the winch to the fixed (here, upper) block, the load/winch cable speed ratio is 1/N in the absence of stretch. As explained on the Wikipedia "block and tackle" page, the mechanical advantage (ratio of load weight to winch cable tension) is N less a penalty due to friction in the winch and sheaves.
 I made it 
  October 13, 2015
BTW.... anyone knnow the story behind Mocpages not allowing applets anymore? I.e. youtube videos? Problem now fixed!! Yea!
 I like it 
  October 12, 2015
amazing
 I like it 
  October 12, 2015
Impressive, most impressive. Brilliant MOCS all the way around.BOAJEWD
 I like it 
  October 12, 2015
Really awesome.
 I like it 
  October 11, 2015
Really impressive; I like it. Well done!
 I like it 
  October 11, 2015
that's a nice build 5/5
 I like it 
  October 11, 2015
IMPRESSIV !!!!!
 I like it 
  October 11, 2015
Wow that's huge
 I made it 
  October 10, 2015
Quoting Gabor Pauler Cool!
Check back in a bit. The youtube video is publishing. I first do the mocpage and then the youtube vid so I can reference it once it is published.
 I like it 
  October 10, 2015
Cool!
 
By Nirds forprez
Add to my favorite builders

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Added October 10, 2015
 You are at the beginning of this folder. Leibherr 1500 8.1
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