oracid

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Everything posted by oracid

  1. oracid
    Bravo Hugolin !
  2. oracid
    Thank you for your help. Indeed, I have no experience at all. Your work looks very good. If you don't mind I will show you my work when I will receive my 3D printer. But I wonder if this thread is the good one for that. Sorry Doug72.
  3. oracid
    Thank you MarcoUbtz, I know this measurements, but do them work good and with what kind of 3D printer and material. My 3D printer will be this one, which is the most popular this days in France, http://www.dagoma.fr/produit/imprimante-discovery200/ My material will be PLA. http://www.dagoma.fr/categorie-produit/fil/polymaker/polymax-pla/ @admin, may be a thread about 3D printing should be necessary.
  4. oracid
    I hope to receive my 3D printer today. I am very interested about your 123D Design file. I made my own file with 123D Design, but I would like to compare your sizes.
  5. oracid
    I am waiting for my 3D printer. When I will get It, I will make all beams from 1L to 34L with holes in each side. For me the goal is assembly solutions. No matter about breaking.
  6. oracid
    I am very flattered... I have duly noted what you say about the tank size.
  7. oracid
    Very interesting ! I would have liked to see a little more about its capabilities.
  8. oracid
    Great tank and great vidéo !
  9. oracid
    I love that !
  10. oracid
    By searching solutions for tank can climb stairs, I decided to do video series on the subject. Here is the first video that shows the environment and a solution with elastics and also shows the importance of the length of the tank. Thank you for your comments.
  11. oracid
    I think my new project will also be a tank. Maybe not much bigger, but with 8 XL motors and an EV3. If it does not exceed 3kg, then I would like to fit it with an articulated arm. Something like a deminer. Of course, I will talk about it here, but probably in a new thread.
  12. oracid
    I do not think the problem comes from the motors but from the battery. No, I will not do more rigid chassis. The goal was to climb real stairs and it reaches. With this new knowledges, I will make a new project, and there, I promise you, the structure will be more rigid ...... if necessary.
  13. oracid
    Excellent! I'll probably start a new project and I will study very carefully what you do.
  14. oracid
    In this video, I propose a solution for crossing the nose of the first step of a stair. My solution consisting of 4 small fixed arm, which does not increase the complexity of control, unlike the mobile arms. The other advantage of this solution is that it does not require an increase in the height of the tank which would have required an heavy rigidification of the structure.
  15. oracid
    What is the best tank's width ? As you know, I am interested in tank and you can see my tests on this thread, http://www.eurobricks.com/forum/index.php?showtopic=119844 During my tests, I found that the more the tank's width was big, the less the track goes out of his lane during a turn on a spot. I have the intuition that when the track follows a large circle, the friction caused by ripage is less. I guess this is because of the shorter distance of the extremities of the track and the perimeter of the circle. But how to prove it? I will like to make a video on the subject, but I have not done great studies and I'm afraid to say stupid things. Could someone explain this without too much math? Thank you in advance.
  16. oracid
    Thanks a lot for your answers. As far as I understand, my intuition was therefore good. For a tank with an imposed length, to reduce friction of the track, it is best to do the widest possible. By reading you, I realize that I forgot to mention that my tank is rather intended to robotic base. I doubt that for a tank, climbing stairs is a problem. Nevertheless, I must carefully consider the problem of the turret which in my case would be dedicated to an articulated arm, for example. It remains for me to explain it in a video with very few words...
  17. oracid
    Lego – 17cm Stair Tank Climber #10 My goal was to climb stairs of real life whose steps have a height of 17cm. To reach this goal, I thought it had to be a very large tank (81cm) and so very heavy 7.5kg. This was a failure. So I changed my mind by making a tank, the smallest and lightest as possible. A final issue exists, it is the nosing that I cannot cross. But it is true that there are all kinds of stairs, each with specific constraints, and want to solve all issues is to risk not to take the first step. I started by 5cm steps and 10cm and today I crossed steps 17cm. I think I have reached my goal. Length: 67 cm Width: 42 cm Height: 12 cm Weight: 1,560kg 4 XL motors
  18. oracid
    10 minutes, it is very long, but I promise you that you will not be disappointed by this latest video of my little series. For those who are interested, they can see the "making off" of the full series here: http://www.eurobricks.com/forum/index.php?showtopic=119844
  19. oracid
    Very, very, very good ! May we have some pictures as clear as the first one, on the top of this thread ?
  20. oracid
    Big Tank Weight: 7.5 kg Length: 81 cm Width: 51 cm Height: 12cm As you know, I show you what works, but also what does not. To climb stairs of real life, with steps of 17cm in height, I need a big tank. Unfortunately, it is too heavy. However, the assembly of 3 tracks with D joint may interest some of you, as well as the drive wheel (2903c01) and the guide pins (32002). This solution is not good, but already I am thinking about another one. I do not give up, be sure of that. Here my YouTube channel :
  21. oracid
    This is great, I like very much the extending boom.
  22. oracid
    It is not only a double track solution. You can assemble 2, 3, 4 tracks, as much as you want. I'm not sure to be a scientist, but my wife says too I'm mad... it must be true then ! I love you too.
  23. oracid
    Medium Tank Climber Test #9 To climb stair steps which are 10cm high, it is necessary that the length of the tank is larger. In this video I show a medium tank that has the following dimensions and characteristics: 55cm length 41cm width 13cm height weight 2kg, 4 engines XL double width tracks In real life, stair steps are nearly 17cm height, the adventure is not over...
  24. oracid
    I have changed my mind, I have decided to continue testing in this thread. How to put two tracks together ? In this video I show how to put together two tracks with a D joint. This is necessary for a bigger tank.
  25. oracid
    I did some pieces with SketchUp, but I confess I am not very competent. Can you tell us a little more about how to make a 3D structure with these images. Thanks in advance. I hope not to disturb this topic.