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About oracid

  • Birthday 08/01/1953

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  1. 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.
  2. 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.
  3. 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
  4. 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.
  5. I sent a mail to the owner. Thank you anyway.
  6. Thanks all. I don't know Kragle, but yes, we can stick. Personally it doesn't bother me. This is a great link ! Thank you. Is it your blog ? Do you mind if I put it in my video description ?
  7. Thank you for the link. So, I understand that my sphere is not an icosahedron.
  8. I use to make topics in the Theme "LEGO Mindstorms and Robotics" but in this case, I thought that this could interest other people. In this new video, I show how to make a big Lego sphere. It is a kind of grail which, to my knowledge, has never been resolved in Lego, except with bricks. Some will say that the axes are arched and that consequently the solution is not admissible. Too bad for them ! This sphere could be used for an inverted Self Balancing or as a fairing for a drone. It was this latter possibility that inspired me. I think my solution is not quite a soccer ball. The soccer ball, I believe, is based on 3 pentagons with one hexagon in the middle, or 5 hexagons and one pentagon in the middle. Which amounts to the same. While in my solution, we do have 5 hexagons and a pentagon in the middle, but we don't have 3 pentagons and a hexagon in the middle. To tell the truth, I didn't do it on purpose. It would surprise me a lot that I could innovate in this area, but who knows, this may interest some tiler ...
  9. Thank you Jim. I did as you said.
  10. Good work ! I use this : https://fr.aliexpress.com/item/32868911434.html?spm=a2g0s.9042311.0.0.27426c37iJLips
  11. 4BQ-1 is my first new quadruped for this new 2020. Characteristics : - weight, 785g - length, 33cm - width, 26cm - Arduino Uno - Shield Uno R3 V5.0 - 8 servos SG90 - alim HENGE UBEC 5V - 6V - 7.4V - 12A - battery 2S - boom stopper (fuse) Don't hesitate to ask information.