trekman

Eurobricks Citizen
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    164
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About trekman

  • Birthday 11/10/72

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  • Gender
    Male
  • Interests
    Technic lego, photography, computing, video editing

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  • Country
    Ireland
  1. I thought the first photo was the real model, and then I started looking for the Lego one. Oh hold on. That is the Lego Model. The building is one thing, but it is the photography that really brings the trucks to life. Great trucks and great photos.
  2. I would find it hard to see why one of the 1 x1 round tiles would break, as the load is being distributed among so many. If anything, there may be some wear under use, but this will be replicated across all the tiles. Great idea though, and it is nice to see the use of the curved rack piece starting to develop into other applications.
  3. Well, I just want to let you know that I am throwing in the towel in this one. After many weeks of frustration, I have had to admit that I have not been able to get my walker walking as I would have liked. The largest problem was the sequencing of the functions, due to the weight shifting ankle movement. There should be about eight movements on the valves in a complete cycle. Each movement piston movement triggered a switch, which then caused another movement. But whilst this was easy in theory, in the original plan, the two ports on the switch did not actually work the two ports on a cylinder. There needed to be some crossing of circuits. As a result the walker locked up within a cycle, as the exhaust air was not exhausting properly. I then resorted the right leg switch operating the left leg, and then the left leg switch working the right leg. The ankle movements were added later. This did create a cycle which worked, but not in a constant action. It also took some time sorting out the ankle weight shifting. This does work, but only a short powerful stroke was required, ideally a cylinder half opening, which was impossible to achieve. There were other issues with cylinders having minor leaks, which caused irregularities in the cycle. Needless to say, this is much easier to achieve using an NXT, or motors and switches. I don't give up easily, but due to work commitments, and other time factors, I have to reluctantly pull out of this one. Thanks for your encouragement in the early stages.
  4. This is great now. A big improvement on the first attempt.
  5. My walker is walking, and I am just working on the weight shifting at the moment. I will try and post some photos. I actually wasn't even looking at videos of previous effort before I started mine.
  6. I hope that this helps
  7. If you could lower your pivot point slighly at the rear of the dump bed, this way the actuators would be pushing back as well as up. This does help in the initial start up of the lift. As presently the actuators are trying to push up from a near horizontal position.
  8. I would fear that the weight of the beams alone, which make up the dump bed, have reduced the load that the actuators can tip. Also why do you have the two raised sections in the floor of the bed. Is that to make room for your L Motors powering the dump bed? If so, I would have repositioned the motors, and had a flat bed, and reused the panels (much lighter) on the sides of the dump bed.
  9. If that is the shape of your main chassis, then I would say that you need to have a deeper frame, with more diagonal bracing. Look at the Technic Unimog, the designers there used diagonals to brace the top and bottom of the chassis to reduce flex. And it was only half the length of your truck. You need to understand a little more about beams and how they work. Loads are carried on the top and bottom flanges, they further apart they are, then a greater load can be carried -with minimal distortion. I hope it works out for you.
  10. Hopefully the pneumatic cylinder will shift each leg at the ankle, and then I may be able to straighten the top part of the torso with another cylinder at the waist. The grey foot is the improvement with the cylinder added.
  11. I present to you my effort in this competition. This will be a pneumatic walker, powered by a separate compressor. There will be a supply going to the pneumatic valves. These will create a sequence of eight movements at four cylinders, which should be enough to lift the legs and tilt the lower body. This is very much at development stage and will be added to until the deadline. I have a nice selection of pneumatics, which makes this contest quite appealing.
  12. Lovely bike, the yarn system is slightly reminiscent of the old flex system, but you have infinite lengths available. The whole build is certainly thinking "outside of the box". Well done.
  13. Now that is a lot of planning, work and detail. I especially like the lighting. Well done.
  14. Interesting jeep, but would not be to my taste. You have managed to fit in the functions well.
  15. http://www.brickshelf.com/gallery/mervyntomb/Arocs/dsc_6892.jpg I hope this helps.