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About oracid

  • Birthday 08/01/1953

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  1. Very good movement control !
  2. It is not easy to find the good gaits. In my quadrupeds I use to draw a rectangle. In my last video the rectangles are not symmetrical. The rectangles of the back legs are a bit on the back. In addition, in your quadruped the masses are not symmetrical. So you have to compensate. At the end of the legs, I sticked chair leg pads. At the moment I think that is the best.
  3. This is very good ! I would like to see more walking. When turning, try to make one side legs forward and the other side backward, like a tank. Why the end of the legs are so complicated ? Rubber is not needed.
  4. So good !!!
  5. Hello everybody. Here is my last video. In this video, I made a 4 bars linkage quadruped instead of 5 bars linkage in my previous quadrupeds. This is very important for acquiring more knowledge in this area.
  6. Here is the final version of my 4BQ-1 project (FourBarQuad-1). I completely redesigned the servos block. I positioned the servos on the front and no longer head to tail. I replaced the ultrasonic rangefinder by a Laser rangefinder, the VL53L0X, it is the very small black rectangle on the front panel. The weight is 860g, which, in my opinion, is the extreme limit that can support SG90 servos. The video is coming soon. In the meantime, here are 2 photos.
  7. oracid

    Technic SG90 servo holder

    I hope this will inspire you.
  8. oracid

    Technic SG90 servo holder

    This looks very interesting ! But as far as I can see the wheels motors are not yet on board. Do you intend to use SG90 servos with continuous rotation ? If you are interested about mixed technos, Lego, Arduino, RC, 3D Printer, please have a look at my YouTube channel.
  9. oracid

    Technic SG90 servo holder

    What about this ? These do not work, but I will soon present one that works in this thread, https://www.eurobricks.com/forum/index.php?/forums/topic/175266-fourbarquad-1-4bq-1-quadruped/
  10. Here is a new mechanism that looks more like a real quadruped leg. In this video, I show that a parallelogram with an extension can be considered as a simple parallelogram. This greatly simplifies the calculations.
  11. In this video, I show a quadruped leg based on parallelogram linkage. Usually, a 4 bars linkage has 2 sides consecutively egal , and the 2 opposit sides egal too. You can see it here : https://www.eurobricks.com/forum/index.php?/forums/topic/175138-4-bars-linkage-with-parallelograms-actuators-for-quadruped/ This is too a 4 bars linkage, but with parallelogram frame.
  12. oracid

    Lego - BIG is a rover

    Hi. Here some pictures and links those I hope they will help you. The wheel diameter is 27cm. Each yellow bush are separated with soft silicon tube. https://www.bricklink.com/v2/catalog/catalogitem.page?P=32034&idColor=86#T=C&C=86 https://www.bricklink.com/v2/catalog/catalogitem.page?P=10288&idColor=120#T=C&C=120 https://www.bricklink.com/v2/catalog/catalogitem.page?P=6538c#T=C https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265c#T=C https://www.bricklink.com/v2/catalog/catalogitem.page?P=43093#T=C
  13. What you say is funny because at the beginning I started to build your dodecahedron. Then on each big pentagon, I built a little pentagon connected to each vertex of each big pentagon with an axle. Then I have suppressed the side (axles) of the big pentagons. And the result is the sphere I made. Hope you understand what I say. Not easy to explain. Livio Zefiro wrote a comment.