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DrJB

Eurobricks Dukes
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Everything posted by DrJB

  1. DrJB
    Beautiful. I knew you'd join us ... sooner or later :) Here is another one, the so-called 'chicken-foot' pattern. It's often seen on fabrics/curtains/wallpapers ... p4 I think
  2. DrJB
    Yes, I remember that day VIVIDLY ... she was the 'proof' that anyone can make it, to be an astronaut.
  3. DrJB
    Found two more, moving away from p6 to p2/p4 (need to check terminology). The first one is rather 'trivial'. I like the second one, it's starting to look like Moorish Zellige (Tiling/Tesselation) with more than one basic shape.
  4. DrJB
    Very nice ... I need to go read a bit more about the 17 Groups :) I tried few more iterations in LDD and most/all figures I came up with have the p6 symmetry. Essentially, all figures can be reduced to a hexagon with some curvy/crazy edges. This for sure has to do with the parts available to us. Then I discovered a NEW (to me) part on Bricklink. By combining the two parts below, we can then do p4 groups. Pushing this further, we can even try tesselations of 2 groups of shapes. I can't try the combinations below as the part does NOT exist in LDD yet ... but, I just placed an order for few of them. The holidays for sure will include sometime with Lego. + By combining the above two parts, we essentially have the 4-branches equivalent of . One can try this other part ... but I have none. Correction: Found it, in fact, I have 50+ ... that I got some time back from the PAB wall.
  5. DrJB
    I stand corrected :)
  6. DrJB
    Here is another one, using the 'same' basic elements as aeh5040 ... though less compact.
  7. DrJB
    Whatever happened to McAuliffe? What were the criteria to select some women over others?
  8. DrJB
    Regarding the various shades of blue, I'd love to see more of the Dark Turquoise we had in the 8450 Mission and some other small bionicle sets.
  9. DrJB
    Beautiful, thank you for sharing. One small comment if I may: The unit might shake a bit less if the 2L ++ half-width lift-arms (attached to the motor) are replaced with cams (below) can be replaced by I also like how 'physically realistic' the motions of the waves and the swaying of the palm-tree are NOT synchronized. And this is TRUE in real life as well. The two motions are due to two different physical phenomena :)
  10. DrJB
    As much as I agree with many of your points, I am not sure I've seen discussions like these accomplish much with TLG. Do not get me wrong, there are many things I wish the TLG did differently, though in the end, they are driven by their own 'strategy' to ensure you and I (and countless others) keep on buying their sets (no issue with that, it is a personal choice/addiction) ... yet I've seen VERY FEW times TLG listen to the community. In the end end, it's ok to dream and wish, especially this time of year ... Happy Holidays.
  11. DrJB
    Beautiful! We have 3 solutions so far. I'm working on a BL order ...
  12. DrJB
    Thank you for the kind words ... and sorry about the added expenses. On the plus side, many of those connectors are now available 'primarily' in monochromatic colors (grey/white/black) and one needs not invest too much. That said, I'm collecting parts to reproduce your kinetic sculpture (beautiful work) but difficult to get the orange connectors, especially over this side of the Atlantic. And, for 17 groups, another geometric fascination of mine, I found the app below (iOrnament) sometime back. One can literally spend hours on it. I have not attempted to understand the math behind the reason for only 17 though. In the paid version, he extends the 17 groups to projections on a sphere. https://itunes.apple.com/us/app/iornament/id534529876?mt=8
  13. DrJB
    First time I see this part in blue
  14. DrJB
    Some of my favorite parts are below, and I have a relatively large collection of them. I sometimes use them to build 'periodic' structures and, while doing so, and 3D printing some Escher 'lizards' in the background, the idea of Tessellation came up, and I did the two shapes below. What other 'tessellations' you know of (or you can come up with) using primarily the parts listed above? Of course, you need not restrict yourself to only those.
  15. DrJB
    I came across a very lego-look-alike toy on Amazon, and yet 'Lego' is never mentioned in the description. Is this yet another illicit/shameless imitation? https://www.amazon.com/Builder-Building-Control-Programmable-Warranty/dp/B0769LNZFM/ref=sr_1_25?s=toys-and-games&ie=UTF8&qid=1513010531&sr=1-25
  16. DrJB
    A stunning masterpiece. Thank you for sharing, and opening up our minds to 'no-wheels' technic models. All the best with the contest.
  17. DrJB
    I have 2 copies of the 8376 set (Hot Flame). One is open/used/complete, the other is sealed (minor shelf wear). I'm afraid though that shipping to Australia is going to be prohibitive.
  18. DrJB
    What triggered this topic is a recent discussion/thread about the Lego Technic Color Palette, and the availability of affordable 3D printers (e.g. monoprice 3D, $200). I have two 'goals' for this thread: 1. A repository of custom/interesting and Technic compatible STL files (beyond what's on thingiverse.com) 2. As the question: Can the LCad parts files be converted into STL? With #2, is it 'legal' to print Lego parts in 'own/custom' colors (not available from TLG) ? I understand doing this for a profit is a no-no, but if a person wants to print parts for their own use, what's the legal implication? Any thoughts/comments?
  19. DrJB
    Received an email today from TLG. It seems there is a 'very-watered-down' version of Mindstorms, and programming is enabled via tablets. There is already a motor and a color sensor. This sounds like a promising platform, and I wonder if the system is expandable and other sensors are planned. https://shop.lego.com/en-US/Creative-Toolbox-17101?CMP=EMC-VIP2017_06_06_Boost_EN+_US&HQS=50_A_CTA_NA_EN&RMID=SAH_2017_06_06_Boost_NA&RRID=1088827
  20. DrJB
    Very nicely done. I think the main challenge with this (and all other ral life applications out there), is that to control specific motions (from all 6 DOFs) would require rather complex formula since the motions of the various LA's are NOT uncoupled. Incidentally, I have developed such formulae (as others have I'm sure) and will share them if there is interest. The next issue is how to sync/link the motions of the 6 LA's? And there, as someone pointed above, would truly require some clever programming with 2x NXT/EV3 bricks, All in all, you've built a rather 'deceptive' mechanism ('positive' deceptive in the sense that it is way more complicated than it looks) that presents multiple challenges (who doesn't like these?) in all areas of physical build, math/formulae/kinematics, and lastly NXT/EV3 programming. Oh yes, I do like such 'multi-faceted' contraptions.
  21. DrJB
    I am not sure why such 'obsession' with comparing the two. They both have their applications. To me none is better than the other. I think of them as two different tools in a toolbox, and they both serve different yet complementary functions. If you want precise positioning, then it's LA. If you want realistic models (8455) and compact builds, then it's pneumatics. Why do I have to pick a favorite?
  22. DrJB
    Great topic. I initially was a 'purist on the fence'. But then one day, I decided to cut a differential and use its 2 clutch gears to open up options for a transmission. This went up a notch as last week, I got a 3D printer (nothing fancy) and now am seriously contemplating the idea of 'custom' parts. As to my 'view' on using 'custom' parts, definitely yes, as those help extend (push forward) what one can do with the standard assortment of parts.
  23. DrJB
    One thought comes to mind. Depending on how much load you want the robot to carry, do you think one single motor per wheel will be sufficient? The 'weakest' part is typically the axle from the motor (and thus the wheel) and there is so much load it can carry, but not more.
  24. DrJB
    Amazing renditions of the two monuments. Kudos. Are LDD files available? .. if not, has anyone tried to reverse-engineer these marvels?
  25. DrJB
    I never got the McDonalds sets, but I have a huge bionicle parts box. If you tell me exactly which parts you need (and color), I'll look for them and get back.
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