DrJB

Eurobricks Dukes
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Everything posted by DrJB

  1. Certainly, here it is. tetrahedron.lxf Ah, ok, found my mistake. I replaced ALL the 2L axles with longer ones
  2. I tried, but no success so far. I'm still not sure how you can tile this ... ... into this The only one I could do is shown below
  3. I think I recall seeing this discussed a while back but do not recall ... Yes, these motors are 'powerful'. As such, they draw more current than current PF motors. The question is: Are they compatible with the PF power supplies? (current limiting and load/heat)
  4. I have 5 total, 1 came with the 8421 crane, and 4 (2 each) came with RC Hot Flame. One Flame is still sealed.
  5. Nope, black pins and pin holes on the white arms.
  6. Bricklink says 8880 came with both parts, and in also two different color variants. My 8880 came with WHITE parts, with PIN (round) holes. Though, you can make both work by using either of these two pins. and But of course, you already knew that :)
  7. Very nice ... You mean like this? This is a periodic structure, and might as well reside in the Chemistry thread. I do see the octahedra, not sure about the tetrahedra though... unless I need to do 3D tiling (above figure has only 1D tiling).
  8. I think this topic is over now. Most of us think of Lego as a hobby, not to become experts on batteries. The main questions have been answered, though I'm sure some audience members will find your post/link useful. True, the AA batteries are also heavier than the AAA ... but in the end, everything we build is a set of compromises. I understand that some of us True/Seasoned (older/experienced) engineers are after achieving stretched 'optimizations' ... looks vs. function vs. dynamics vs. durability vs. long lasting batteries vs. weight distribution vs. tire rolling resistance vs. cost ... you get my point.
  9. Very nice. If you're in the Chicago area, l'm sure you've seen the one in Navy Pier (Children's Museum). Though if I recall, that one was not to 'proper' scale. If you plan on finishing this project, don't forget the 'glass box'. :) Do you have an approximate parts list? Those technic beams must have costed a fortune.
  10. Don't be too hard on yourself. We all make/made mistakes, especially those of us with lots of experience. This forum, to me, is about learning and sharing and I hope we achieved that, even though some feathers got ruffled.
  11. Here it is ... Two 'intersecting' Tetrahedra. and an LXF file for those willing to experiment further. tetrahedron.lxf You're right ... this calls for a clear mind, not for a late night activity. :)
  12. Thank you. That's exactly my point. We should abstain from making 'blanket' statements. As to me using a Russian word, I was not being 'offensive'. I was being 'playful' ... just to make sure you do not miss it. If that offended you, then ... Я извиняюсь ;) Now, back to batteries: All batteries of a given nominal voltage deliver that voltage (there are variations depending on the chemistry inside). However, a larger battery (AA) will deliver more 'juice' i.e., last longer than a smaller one (AAA). I thought this was the main point being discussed. If that's not it, then ok I misunderstood, let's move on. I was however not being careful with terminology (8878 vs 88000).
  13. @ Didumos69 and aeh5040 ... You're both right. I was playing with 'magformer' shapes few days ago and thought I could do few tetrahedrons in a larger one. I was wrong. Now, I like the idea of extending this beyond Plato's shapes, but that would require investing in many more connectors than I have. The real difficulty here is that many of the shapes require angles that are 'not' available within the standard lego connectors and as such, any attempt of virtual modeling might not work. I have quite a few of the triangular shaped connectors, and will get to exploring more shapes during my evenings. One good starting point though would be the magformers set from Amazon ... and the sample shapes below. One word of caution though. The magnets work fine for small structures. Large structures tend to be too heavy for the magnets and collapse easily. I just realized that all above shapes require 4 edges per vertex ... Not sure this is doable in Lego. Might need to restrict to three edges/faces per vertex. Yes, very good point. The only 'connection/vertex' that is easy to do with any shape is the one below. It requires two thin wheels, 3 connectors ... and quickly gets real busy. Also, and because of gaps in the parts, the resulting construction is 'not' solid.
  14. I'm sure you know this already but, for those who do not, you can extract a parts list for the LDD/LXF model. Granted, it is not necessarily complete, but that'll give an idea as to what parts to expect and which you need to start buying.
  15. Really? ... Read again пожалуйста
  16. Neat. I wonder if one can build two 'intersecting' tetrahedrons (with lego) i.e., one as you showed, the other using the 'other' diagonals... Will try tonight at home.
  17. That's exactly it. The AA batteries are larger, and as such, will last longer. Now, there is a version similar to the 8878 that is rechargeable. It is mostly useful in situations where it's difficult to remove the battery pack.
  18. You're absolutely correct. My typing and thinking were not in-sync that day :) The tetrahedron has 6 vertices, and these correspond to the faces' centers of a cube. Vice versa, the cube has 8 vertices, and those fit inside an octahedron, meeting the centers of the triangular faces. One additional fact, the tetrahedron and cube can be 'filled' with smaller replicas of themselves without any gap. This is obvious or the cube, but a bit more of a mental challenge for the tetrahedron. This is not true however for the dodeca/icosa-hedrons. For the octahedron, I'm not sure ...
  19. Thanks. There are many lego renditions of these solids on the net. I did them in Technic, but other people have done them with system parts (plates and hinges) and others with bionicle/hero parts. In fact, at all the Brickworld events I've attended, there is always one person displaying many geometrical designs. Last year in Chicago, one person had displayed many 'Fractals-based' designs.
  20. What, No Flex Axles? Seriously though, beautiful piece. Are instructions and a parts list available? ... No 'patience' to go through 18 pages of posts :)
  21. Very nice! I wonder how they can achieve such 'odd' numbers. But then again, these are Certified Professionals.
  22. The Museum of Science and Industry in Chicago is having a Lego exhibit, called 'Brick by Brick'. I'm debating where to put the pictures to share, but in the meantime here are few of a very large Ferris Wheel that uses both system and technic parts. The overall diameter is more than 4×32M. I'm also attaching an LDD that re-creates some of the sub-elements. I have few more high-res photos for those interested in more specifics. I believe the model is by Adam Reed Tucker, the author behind the Architecture Series. MSI Ferris Wheel.lxf
  23. Yes it was, as stated in picture below, from 1893. The gondolas have only 5 windows in the actual wheel, but 6 in the lego version. Not sure why. ALso, the actual build makes use of several 'illegal' connections (colored parts in my LDD).
  24. Here is a periodic repetitive structure, built with only 2×4 bricks. Not as elegant as technic connectors, but uses a single part. This is on display at Chicago's MSI (Museum of Science & Industry)
  25. Thank you. I bought those orange globes a while black. I thought they'll make great street lamps ... first time I actually get to use them. Also, here is another rendition of the cube, this time an LDD screen-shot.