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DrJB

Eurobricks Dukes
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Everything posted by DrJB

  1. DrJB
    Very nice, and thank you for sharing. At 17:25, one could see this part (below) in white whereas bricklink says it was released only in black and LBG.
  2. DrJB
    You can ask efferman, he's been making all sorts of STL files.
  3. DrJB
    Top Left Corner: Are we getting this in black ?
  4. DrJB
    My answer will be a bit different than those above. I have the 42009 and found it to be a little 'boring'. Maybe because I also have all the other cranes that came before it. If you must choose only one, then wait for the 42043. If you can afford both, then by all means. The problem with Lego is, you never have enough, and somehow you're always drawn to get more.
  5. DrJB
    Since we're off-topic, and the MODs may opt to split this thread, there are outliers that totally blur the picture. The best example I can think of is 9398 vs. 41999. Both sets had the same MSRP ($200.00), and yet 41999 had more/unique parts. Unless its price was offset by the marketing/advertising group. vs. = $200
  6. DrJB
    That sounds interesting. I'm guessing you ran a regression analysis and the correlation coefficient was over 90%. Now, do you recall which sets were outside of the 90% band? Outliers sometimes have their own story and could shed more light on the pricing model. For example, I would run two different regressions, one for models with PF/motors, other for models without PF/motors. I bet the separate correlation coefficients would get even higher. After that, we can simply 'reverse' engineer Lego's pricing structure. Of course, one can also extend to non-technic, but the outliers there are the painted minifigs as those tend to push the price up. But ... I'm digressing
  7. DrJB
    Most Vehicles do have 'by design' a dead-band in the middle to make sure the vehicle does not steer erratically due to small driver inputs. However, +/- a quarter turn seems rather excessive. Typically, and for road vehicles, the faster the vehicle can travel, the smaller the deadband, as such dead-band affect 'perceived' vehicle handling (e.g. how fast the vehicle responds to steering inputs). I know in construction machinery, steering is typically done by hydrostatics via an orbitrol valve, and there, because such vehicles move slowly, steering is almost instantaneous. Unless for trucks, we do not want them to be zig-zaging on the highway (dangerous) and the dead-band is large on purpose. I have yet to see a consistent/coherent price model for Lego. A recent discussion we've had on here suggests that the price correlates best with the total weight. Yes, PF are expensive, but they're quite heavy and weight-wise, equivalent to several plastic parts.
  8. DrJB
    Less than the Volvo Wheel Loader? This is indeed Good News! I always felt the Volvo was overpriced.
  9. DrJB
    Thank you. This sounds like a very promising lead. I was not aware Brickstore had the mass information. Once the total mass is calculated, I agree, it's fairly trivial to 'approximate' the moments of inertia as the structures I'm after are relatively simple geometric shapes. Cheers.
  10. DrJB
    Agreed, dank je
  11. DrJB
    That was about pneumatics only but fair enough, can you merge the topics? That much I already knew . The question, as I stated above is: What do the new parts enable you to build that was NOT possible with the old parts. The reason for the new gear, is, per a couple of answers, to make assembly 'idiot-proof'. Agreed, the old one would disengage because it has triangular 'wedges'. The new one had straight wedges. Not to turn this into 'criticizing' the new parts but, if this was the sole purpose, they could have simply redesigned the old driving ring and keep it 2L long. Unless it was done for ease of differentiation between old/new.
  12. DrJB
    Thank you, but my question was about whether the existing lego tools had such functionality. I know that professional tools (AutoDesk and others) do have such functionality, but importing Lego geometry in them might be a real challenge. I was hoping that, with the amount of engineers we have on the forum, maybe someone has already figured out a way to do this. As for going to college and learning CAD, well, ... suffice it to say that after several graduate courses in Solid Modeling and a PhD, if I were to go back to college, it'll be for teaching, as I might be too old to be taking courses.
  13. DrJB
    This year we are being 'spoiled' (or maybe will be) with a collection of new Technic parts. Like many on here I have few ideas of course, but was thinking what one could possibly do with the NEW parts, that was simply impossible with the OLD parts. The new clutch gear and selector come to mind of course, and in this case the question is VERY simple: 1. Why on earth would you want to couple such gear from both sides and 'sandwich' it between two driving rings? This gear can be mated/engaged on both sides with . 2. Does anyone know of an application where the above gear would be useful? 3. What other ideas can you build with the NEW parts that are not possible with the Current? I'm betting many answers to #3 will be about the long gear racks and pneumatics.
  14. DrJB
    Impressive as always ... but I do not have any green parts :( What would be interesting, and maybe that's a question for Rebrickable, is what sets one can start with that'll contain 7-80% of the parts?
  15. DrJB
    You have the correct concept/understanding in your sketch. Both solutions are exactly the same (from the kinematics). In fact, the two assemblies below have exactly the same functionality + + = + + The parts are almost a one-to-one match (from the kinematics/function). If this answers your question fine, otherwise and if I misunderstood the question, ask again. = = =
  16. DrJB
    I'm tempted to say it's nice, but I prefer to say it's rather cute ... so small it seems, and with a lot of 'character'. Also, you're using non 100% lego parts, and some purists may frown upon that. All-in-all, nicely done!
  17. DrJB
    This thread got started in Sept 2013, and is now seeing a new wave of interest. Is it appropriate to say it too, is coming back from its own dark age?
  18. DrJB
    I'm an engineer, work on noise and vibration, essentially everything that shakes and makes noise. Measuring a force is typically not easy. There is however a way to calculate the forces from measured deformations (strains) by use of 'strain-gauges'. In this case however, the 'easiest' way would be to take the two constructions side by side and keep on increasing the load until one of them fails. I must warn though that testing for failures is not very 'repeatable' and one must test several times and run some statistics/averages, unless you want a simple answer of A vs. B. That said, in my view there is no need to test as the answer to this problem is known, as explained by both Blakbird and myself in prior posts.
  19. DrJB
    Is that something you built? What is it?
  20. DrJB
    TFOL = Teenager Fan Of Lego This was explained in a prior post. People thought you cannot buy because you do not have your own credit card yet ...
  21. DrJB
    You sure have a very 'eloquent' way to explain such concepts in simple words. When on here, I need to learn to dis-associate myself from what I do for a living ... not easy though!
  22. DrJB
    Agreed, that's a bit on the high side. I'll wait as well. Thanks for the heads-up. And I owe you a special 'Thank You' for that 'other' thread of mine, for being the first one for jumping in and posting a positive note.
  23. DrJB
    Thanks. I had totally forgotten about that thread. It's good that my story is consistent
  24. DrJB
    Not sure those old 8880 parts will ever be made available in LDD. They are long gone and have not been seen in a very long time. Now however, I am not sure I understand exactly your question as with those parts, you can have all three functions (steering, driving, suspension) together. That is exactly how it's done in the 8880.
  25. DrJB
    This question came up in a thread in the Technic Forum. I was then advised to ask it here. So, here it is: Is there a way, with any of the digital tools, to calculate the total mass and location of the Center of Mass (CG) of a given assembly?
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