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  2. Thanks for the comments.. I'm really confident this will run well at a show.. just under 2 months before BV.. so plenty of time to keep testing The only change I wish I'd thought about, would be to have each section independant, which would allow a 'challenge' of automatic explosion, but manual conveyor (can you keep up with the explosions?! :) Maybe a redesign after it's proven itself first!
  3. My new MOC is probably the weirdest Lego Technic car (I) ever uploaded- it is made to be invisible and to work autonomously. Its use case is based on the fact that at a party, you never really get the snack you want without interrupting talks of others. My solution is a small robot that follows the edge of the snack table while carrying the snack tray(s). That is where the name comes from, it 'races trays' around the table and I liked the software-origined word 'Raytracer' a lot. For the same reason why a car exists with the name 'Interceptor'. I have done some exploring in this area, a few years ago TrayRacer 1.0 was published. But it could only follow rounded tables. And that got me thinking: can you build a Lego Thing that is able to understand when there's a corner coming up? The first answer was 'no'. It was never done before and I couldn't think of any way. The second answer was 'Well, for the intended size, you will need a mechanical sensor and a mechanical 'brain' that is able to translate the 'mechanical sensor data' into 'Let's start a steering action NOW'. That's a lot of quotes, how to convert this into hard plastic bricks? After a lot of thinking, tinkering and tuning TrayRacer 2.0 was born. It is really hard when you throw the remote out of the door, to make the robot think for itself without using the convenient Mindstorms sensors. TrayRacer 2.0 uses only a single PF M motor and is full mechanic Lego Technic. There's an important reason why I only used an M-motor: power consumption. A nice robot system with a lot of sensors and actuators will be always empty as the testing is done and the party is starting. A simple rechargeable battery box with a PF M motor is small and reliable. I added PF navigation lights because it looks good in the dark, which looks good on the party. The new TrayRacer 2.0 is 4 studs high, exposing the 4-stud batterybox as a load on the back. This had to be accepted as I needed the speed control: you HAVE to be able to set the 'feeding speed' on parties otherwise people eat way too much. In other cases, maybe an old battery would have been a solution. [As a sidenote: with the new Lego Technic electronic systems coming up, I don't see battery boxes and motors becoming any smaller. This is a bad development that TLG should be aware of. ] High quality photos (Brickshelf files not yet public, so direct links:) 1 2 3 4 5 6 7 8 The video explains it all: The deep technical details- a dynamic system Usually, 'mechanical sensor data' is fed into a clutch/driving ring or a differential, which means the device using the data also influences it. The 'mechanical imput impedance' is too low (This robot is built using mostly electronic engineering concepts..). In the RayTracer 2.0, this effect is visible in the sensor wheel. It takes some effort to shift the driving ring, which means the rubber band needs to be stronger. As said in the video, the sensor wheel needs to be pressed to the RIGHT (so robot pressed LEFT) for straight driving, which is harder when the rubber band is stronger. Because the robot is very light (lithium battery, no big electric components) a stronger rubber band means it needs to push harder to the LEFT, which is only possible when its rotational inertia is higher, so then it needs to be heavier. But weight kills power consumption. A lower weight causes oscillations, as the robot slams to the left using its inertia after a succesful steering action - enabling straight driving- , then the rubber band springs back because the robot is not able to press hard enough to the left continuously- enabling the left wheel brake again-. When the rubber band is too strong, it oscillates forever, when it is just a little too strong, the robot is designed to reach a stable orientation in a few oscillations. In the video this effect is sometimes visible, you can see different dynamics with its bodywork removed! Also, as you can see, the sensor wheel is on a long lever. The lever enables tuning of the force needed to press it to the RIGHT, thus for tuning it together with the rubber band system. To summarize: because the 'mechanical information' is influenced by its 'processor', there is a fine optimum in rubber band strenght vs sensor wheel lever length vs overall robot weight. For this reason, I could give you instructions, but there's no guarantee that any reproduction would work. Any axle that is a tiny little bent, any driving ring with some small damage, even the friction of individual pins, these are all factors that influence the final tuning and need to be optimized. Instructionless building with Lego Technic is not only a unique combination of parts, it's also the way it's built and tuned that makes it a final product. Some quick photos:
  4. TheGlynreaper

    LEGO Hidden Side 2020

    jeesh its a joke stop being so uptight but I still stand that playability features are the best things in lego sets but I have noticed myself that the whole transforming possessed thing has gone but the 2nd wave why do I get the strangest feeling they toned it down because some numpty thought it was a bit too scary for children
  5. Guyon2002

    LEGO Ninjago 2020

    I agree, this would've been the perfect time to give us Anacondrai Chen
  6. I guess we’re saying the same thing. I count the single landing gears and you count the *groups* of landing gears. :) Anyway, to answer to your question, I prefer the 5/7 much more. It makes the MF more “solid”.
  7. Nissan GTR? Could it be a Nissan GT-R Nismo GT500 ?
  8. Void_S

    Technic 2020 Set Discussion

    Yep, the numbers and names nowadays may have no meaning. Do you remember "42067" that seems was turned into "42070", even keeping the original stickers?
  9. MAB

    LEGO City 2020 - Rumors, Speculation, and Discussion

    I don't really see how having a name printed on the box changes 2020's City from previous ones. Does a child play with an otherwise generic police set in a different way because the box says the names are Duke and Vito or Sam and Snake? In this set, I imagine Duke Detain will chase Vito. Whereas in this set, I imagine the unnamed policeman will chase the unnamed crook. I cannot really see the difference in play. Kids can still make up their own stories if they want to, but to me the roles of the characters in those stories will be more imposed by the clothes they wear than the names on the boxes.
  10. Roadmonkeytj

    [moc] Shay Class A geared Locomotive

    I think this is another fine example of a great base design that we can make our own very sharp looking loco ... Do you have photos of your three truck attempts? Haha thanks for link ecmo47 ... Still need to get around to building that lol
  11. andythenorth

    Technic General Discussion

    I didn't want to start a trend of threads for 'things people might want to MOC', but this was too interesting to not share, so I'm leaving it here... Half-track Claas tractor, with full suspension. As tractors go it's pretty rad. Looks odd but good. Someone's going to build this surely?
  12. benderisgreat

    LEGO Ninjago 2020

    If that's true they should have left Zane in Never realm, to pay for his crimes as Ice Emperor. But apparently it's too dark for kids show... Also is anyone else surprised that there's no Anacondrai cultists in Jungle raider? I was hoping for a chance to get missing cultists in serpentine version. No reason to buy it now tbh.
  13. Roadmonkeytj

    Lego Train Landscape

    Love the rocks and water ... I think the bridge is fitting for a branchline pre 1920
  14. Hello I´d like some help with C++ variable assignment and reassignment. In Global code I declare: publ INT B_red=0; In Sensor event code: if(B_red=0); //its OK B_red=1; //gives an error So I only want to be able to change the value of B_red in sensor event code, how do I achive that? Thanks
  15. Today
  16. Ngoc Nguyen

    42108 - Mobile Crane

    Technically yes, but you will need to spend a bunch of dollars on the 3x11 10 holes shell panels and the 3x11 #5 and #6 in yellow.
  17. Going totally 8-wide would be a bad move. While it looks more realistic, it also means everything has to be stretched to have decent dimensions. So I think it'll be much more than a 25% increase. IIRC I once read in Railbricks that it was close to 100%, so double the parts. I rather see they keep the sets affordable, we can build something realistic in any scale anyway.
  18. Aleh

    42108 - Mobile Crane

    Ok, LA is XL? thanks. Now it seems we can build this set without buying, Am I wrong?
  19. Now this , this we definitely need !!!
  20. Homersapien

    Technic 2020 Set Discussion

    but we want a motorcycle or some kind of bike so 2W means 2 wheels :D
  21. Tim182

    Modular Building Sets - Rumours and Discussion

    You can track any edits on Wikipedia. The editor of the Police Station doesn't have an account, but the IP has made a few edits across Wikipedia in the past. Some appeared to be controversial nonsense in unrelated topics which was subsequently removed, the other edit was on the modulars stating that old Market Street modulars was unique in that it was labelled as a FACTORY, and not a CREATOR product...
  22. allanp

    Technic 2020 Set Discussion

    I do like a good motorbike from Technic. Hoping one day for a really dense and complex superbike with 2 or more speed gearbox and finally working pneumatic disk brakes, as they are so prominent on the real thing.
  23. Ngoc Nguyen

    Technic 2020 Set Discussion

    2w doesnt necessarily mean 2 wheels tho... Just as CRANE has nothing to do with 4x4 Crawler and ELEPHANT has nothing to do with Liebherr R9800
  24. LvdH

    Technic 2020 Set Discussion

    F&F car is supposed to be 42111.
  25. kbalage

    Technic 2020 Set Discussion

    Probably wrecked with only 2 wheels left?
  26. Cumulonimbus

    Technic 2020 Set Discussion

    Ok, you got my attention, but big is not necessarily good...
  27. Ngoc Nguyen

    Technic 2020 Set Discussion

    42107 can be the alleged Mitsubishi Eclipse Fast & Furious that was leaked some months ago.
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