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Robotic Hand

Model of a human arm. Features 4 electric and 4 pneumatic functions.


Completion date: 28/02/2010
Power: electric (Power Functions) / pneumatic (fed from external pneumatic compressor with an airtank)
Dimensions:  unknown
Weight: unknown
Suspension: none
Motors: 3 x PF Medium, 1 x PF XL, 1 x RC

Just another weekend build – this is basically a late realization of an idea I had back when I was a kid. The goal was to build a model of an entire human arm, with palm included, that would have as much realistic functions as possible while being of more or less accurate size. The look of the arm was considered insignificant.

The most complex part of the arm is obviously the palm with 4 fingers and a thumb. The thumb can be bent and raised/lowered, whereas the remaining 4 fingers have two joints in each of them. The index finger was operated independently, and it was fairly possible to operate every finger individually, except that it would take two times more pneumatic hoses, which were already quite numerous (8 of these was going through the arm). The palm can be theoretically rotated through full 360 degrees, but I never actually tried it for the sake of the hoses in the wrist. The whole arm was heavy and a bending under its weight a bit, but it worked well. I think it was pretty satisfactory for something that was built in just two days.


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Media reference:

Brick Tales, Bricks in my Pocket, crave,  CrunchGear, Engaget, Fascinating LEGO Model Of The Day, Hack N Mod, Le Journal du Geek, NowhereElse, Sema Geek, Switched, Tamasindo, The Awesomer, The Geek Church, Tinkerology, Tom-Style

Categories: Misc. Tags: ,
  1. Sariel
    July 12th, 2015 at 18:53 | #1

    You could have just typed that into Google. Here: http://www.bricklink.com/catalogItem.asp?P=67c01

  2. John
    July 12th, 2015 at 12:30 | #2

    where do i get the air tank?

  3. Sariel
    January 31st, 2014 at 09:31 | #3

    Everywhere. LEGO, Ebay, Bricklink…

  4. War
    January 30th, 2014 at 21:38 | #4

    Where did you get those pneumatic cylinders?

  5. Paul
    April 14th, 2012 at 10:08 | #5

    Hi, Paul, this is the most impressive LEGO model I have ever seen. I wish I had learnt mechanical not finance 15 years ago, so that I can design such things myself today … HAAA! Thank you so much to sharing with us

  6. aykut
    December 4th, 2011 at 20:32 | #6

    hello there is a tpe on bionic arm and your arm would reproduce. have to conclude would like to know the steps to achieve it. thank you in advance

  7. September 4th, 2011 at 15:39 | #7

    maybe it is a little late reaction but thats not a problem. you said that you you don’t have that much air but with a bottle you come very far. not that 5000 rpms but its the idea. ik make it to. now with the v8. i make an big trailer voor 4 bottles and an compresser, brakes, an gaspadel(i don’t now how to say that). gearbox. maybe it is an idea? like an truck wit an inline 6 end 3 speed gearbox?

  8. Sariel
    June 13th, 2011 at 12:25 | #8

    I think you’re missing where the air comes from. The engines you have shown need bigger compressor that this hand.

  9. June 13th, 2011 at 12:19 | #9

    nice idea, you have a lot of pumps and switches. why you don’t modifie it and make a engine that runs on air. like a v8. I make an 3 cilinder in a big american truck. do you make an engine like this to? http://www.lpepower.com/ and http://www.techbricks.nl/My-pneumatic-LEGO-projects/lego-pneumatic-engine-lpe-3-cylinder-inline.html.


  10. Sariel
    March 9th, 2011 at 23:51 | #10

    I’m not making instruction. Especially not for something that is clearly visible on photos.

  11. lego
    March 9th, 2011 at 20:43 | #11

    Would have kept silent about instruction of your mechanical arm ?

  12. knowlton
    February 23rd, 2011 at 17:04 | #12

    i wonder what are the parts he used

  13. Szamot
    February 2nd, 2011 at 15:07 | #13

    Mam taki sam stołek ;]

  14. Sariel
    October 24th, 2010 at 22:19 | #14

    I haven’t used any particular model. Good luck building.

  15. Hugo
    October 24th, 2010 at 22:05 | #15

    Very cool what you’ve done!
    I’d like to know what model did you used to build this hand?
    I want to build it, too.
    I’m wainting your answer.

  16. Sariel
    June 11th, 2010 at 13:14 | #16

    Marylin Manson “Seizure Of Power”.

  17. looke
    June 11th, 2010 at 09:31 | #17

    Czy mógłbyś podać tytuł tego utworu, który leci w tle? Z góry dziękuję. I gratuluję, jestem pełen podziwu.

  18. Sariel
    April 27th, 2010 at 15:27 | #18

    Tak, jest zbudowana z klocków Lego. Reszty nie ma, od początku miała to być tylko ręka.

  19. April 27th, 2010 at 15:20 | #19

    Czy ta ręka zbudowana jest z klocków lego? a gdzie jest reszta robota?

  20. Sariel
    March 19th, 2010 at 07:24 | #20

    Because I don’t have one, mainly.

  21. Legot
    March 19th, 2010 at 07:15 | #21

    so why do I not see an NXT in this mass of PF hoses?

  22. Sariel
    March 6th, 2010 at 14:40 | #22

    These are new Technic panels. That’s all you need to know to find them.

  23. March 6th, 2010 at 12:54 | #23

    What’s the part# of those smooth yellow plates on the forearm?

  24. John Connor
    March 3rd, 2010 at 20:27 | #24

    We got BrickNet by the studs now, don’t we?! :o)

    Fantastic build!

  25. Evgeniy
    March 3rd, 2010 at 17:19 | #25

    OMG LEGO Terminator T-1 is coming O_o

  26. Mihály Stépán
    March 2nd, 2010 at 17:38 | #26

    Ok, but pack it carefully so the post service doesn’t damage it. Thanks! ;-P

  27. NaturalBornuser
    March 1st, 2010 at 23:05 | #27

    Kolejnym krokiem byłoby stworzenie rękawicy, dzięki której ruch żywej ręki przekłądałby się na ruch robota 🙂

  28. sverre
    March 1st, 2010 at 21:38 | #28

    I´m hoping for a full size human with tons of PF´s in a few days 🙂

  29. Sariel
    March 1st, 2010 at 19:42 | #29

    Sorry folks, look like you all just got it coming 🙂

  30. Mihály Stépán
    March 1st, 2010 at 18:40 | #30

    Yeah. Sariel’s gonna build lots of PF Its (From the Addams family) and take over the world. (Evil laughter.) 😀
    Nice construction!

  31. March 1st, 2010 at 18:28 | #31

    Now that you have discovered his secret, you will have to be eliminated. A Lego robotic arm is coming for you…..

  32. Alex
    March 1st, 2010 at 18:11 | #32

    I can’t believe you built this in just a weekend …. Do you have some kind of superhero powers? 🙂

  1. March 5th, 2010 at 06:47 | #1