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January 15th, 2009 Leave a comment Go to comments

Simple crane. Features two sections controlled by linear actuators, extendable final section and linear clutch.


Completion date: 31/08/2008
Power: electric (Power Functions)
Dimensions:  unknown
Weight: 0.74 kg
Suspension: none
Motors: 4 x PF Medium

A simple construction designed to test new Power Functions elements, such as linear actuators and switches. I wanted to gain some experience with actuators in particular, and to test various solutions of transferring the drive between a motor and an actuator along the crane’s arm.

The crane is able to rotate through 360 degrees, and lift approx. 0.25 kg. The steering is quite precise, thanks to the actuators. The motors at the back of the turntable are set at angle, in order to keep the universal joints that transfer drive from these motors from bending to much. As you know, universal joints don’t work properly when bent by more than 45 degrees. There is a single linear clutch of my design used to transfer the drive of the crane’s extendable section. As for the other motor, I relied on the internal clutch of the linear actuators.


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  1. Neil
    August 5th, 2010 at 21:53 | #1

    Oh, thanks.

  2. Sariel
    August 5th, 2010 at 21:40 | #2
  3. Neil
    August 5th, 2010 at 21:31 | #3

    I had checked Lego.com and eBay, never heard of bricklink but I just checked, the only one that has them are eBay, but for 28.99 for two of them. How much money for one do you suggest? Thanks in advance! @Sariel

  4. Sariel
    August 5th, 2010 at 21:03 | #4

    Erm… did you try for instance Lego site or Bricklink?

  5. Neil
    August 5th, 2010 at 19:48 | #5

    I’m looking for a good place and price to get some linear actuators, any suggestions?
    ( I,m not planning on buy a entire set, just actuators.)

  6. Jail
    February 19th, 2010 at 18:38 | #6

    really nice! looks funny to operate too…

  7. November 11th, 2009 at 22:40 | #7

    I am so glad that I accidentally stumbled across your blog here. Cool the things that is possible with LEGOs these days. Still remember when I used to build simple lego structures and would be so proud of myself for it.

  8. legokid
    August 23rd, 2009 at 19:03 | #8

    do you mean paul?

  9. Amy
    August 10th, 2009 at 03:36 | #9

    Guess what!
    I am getting lego for my birthday but because I am a crappy builder at lego my star brother is going to build it for me. Hooray for him!
    I love you!

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