62Bricks

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  1. 62Bricks

    Brick Inventory By Year?

    Bear in mind that the dates Bricklink uses for parts are the release dates for the sets in which the part is inventoried. So it relies on the accuracy of the inventories. Many older parts are not in any inventories. The inventories are pretty accurate, and there are a few people who are actively tracking down old sealed sets to verify parts, but it is not uncommon to see a modern variant inventoried incorrectly in a set released before the variant existed (and vice versa - old variants inventoried in newer sets).
  2. 62Bricks

    Yellowing.

    The bromine compound fire retardants used up until the mid- to late-1970s were polybrominated biphenyls (PBBs). After concern grew about toxicity, they were largely replaced by polybrominated diphenyl ethers (PBDEs). These I believe were what LEGO used in the 1980s and 1990s. When they stopped using them (As I believe they have) I do not know. One could isolate bricks from certain time periods by the mold variation. For example, the old 2x4 bricks without cross supports were largely out of production by the mid '80s. Any yellowed white bricks of this variation would probably date to before 1985. The mold pip began appearing on the studs in the mid- to late-70s, so a white 3001 brick without cross supports and a stud pip would date within that approximate 1975-85 range. One with cross supports would be from the mid-80s or later. Here, one could possibly use the mold markings to narrow down the range, as they changed over time. In the early 2000s, LEGO included a copyright notice with the year on some bricks.
  3. 62Bricks

    When A Set Says "X Amount of Pieces"...

    Interesting. No choking hazard warning, either. Incidentally, the "US" version includes labeling in French because of Canadian laws that require it.
  4. 62Bricks

    When A Set Says "X Amount of Pieces"...

    I assume you are asking about modern sets, however it is interesting to note that Lego has changed the way it counts pieces over the years. Although I believe Lego now puts piece counts on all its boxes, this was not always the case. Only some markets required it (like the US) and for many places for many years there was no "official" count printed on the box or instructions. For a period in the 1970s, Lego sets sold in North America printed the number of "interlocking parts" on the box. As far as I have been able to determine, parts that did not connect with a standard knob or tube were not included in the count - flowers, for example. Also, minifigs often came partly assembled with just the legs detached. The head/torso assembly was counted as one part for the purposes of the part count on the box.
  5. The atmosphere is thinner, yes, but not too thin to use. https://www.space.com/41023-mars-wind-power-landers-experiment.html
  6. 62Bricks

    Yellowing.

    I have seen the streaking with light gray as well. And I recall seeing images from someone else who noticed that the streaks were actually in the brick before the treatment, but the difference in colors was so subtle it was not noticeable under normal light. So it may be that the chemicals causing the yellowing are not evenly distributed on the surface? Or not evenly mixed into the plastic? I wonder if it also happens to white pieces but just is not noticeable because they are white?
  7. Thank you! Here is a draft of a new geometry for the walker leg:
  8. Yep - I thought it was pretty clear from my posts that these are ideas, not submissions.
  9. Another possibility is to adapt my Windwalker strandbeest model
  10. I may use a walker mechanism like this wind-up version I made.
  11. For the Mission to Mars contest I plan to build a vehicle specially suited for operation on the Martian surface. Some first thoughts: Use local energy sources, potentially Wind Solar Gravity Adaptable to the Martian terrain sandy/dusty surface scattered rocks slopes and hills Modular/configurable for different tasks and conditions
  12. All good reasons why a simpler, consistent definition is needed. Sellers of used sets might not like it, but the simplest solution would seem to be that a complete set includes everything that was in the box, whether it was "left over" or not. Unfortunately, the approach of the Bricklink admins is mostly in the direction of making things more complex, not more simple. It should surprise nobody that the Lego hobby attracts people who are really into complex systems. But sometimes simple is best.
  13. Actually, they are not considered part of a complete used set. That's the problem - Bricklink now has contradictory definitions of what an "extra" part is. As for why they made the change, I think it's because they want to encourage the growth of the big sellers who part out new sets in large numbers, so they want the regular item section to match the actual contents of the box as it comes off the shelf. So they decided that parts on sprues and multi-packs (the little separate bags with tools or accessories) should be considered "regular" parts so the part-out sellers don't have to split them up. And either they did not realize the effect this would have on the sellers of used sets, or they knew and didn't care. Either way, it's pretty clear that Bricklink is prioritizing the large sellers of new bricks over collectors and sellers of vintage parts.
  14. A real-world issue has arisen because of Bricklink's change in inventory policy. https://www.bricklink.com/message.asp?ID=1141811 As a response, Bricklink is now claiming that the set inventories have always only been "guides" and were never meant to be used for buying and selling complete used sets. It just gets weirder and weirder there. For years, both buyers and sellers have referred to the "regular items" section of the inventory when listing a used set as complete. Now that section includes extra parts that are not necessary to consider a set complete, but which buyers might reasonably expect to be included because they are listed in the regular inventory - like the expensive extra plumes and feathers in classic castle sets. So basically, the set inventories are now useless as any kind of reference for buyers and sellers. What's weirder is that Bricklink says it has always been that way: https://www.bricklink.com/message.asp?ID=1141828
  15. The slots on the underside of the older bricks are more squared off, where the newer ones are rounded. It's difficult to describe, but I'll see if I can add a photo later. One quick way to tell the difference is the axle hole in the oldest version was flush with the top of the brick, where later ones have a somewhat recessed hole.