Jump to content

Davidz90

Eurobricks Knights
 View Profile  See their activity

  • Posts

    591

  • Joined

  • Last visited

 Content Type 

Everything posted by Davidz90

  1. Davidz90
    Unfortunately not, and the link in video description doesn't work for me. The aluminium gears seem to be cast, with drilled/machined holes? The surface finish looks very rough. Too bad the vendor doesn't seem to specify what aluminium type it is exactly, there are substantial differences between various types.
  2. Davidz90
    I'd love to know people's experience with these. Considered buying some, but prices put me off. From what I saw on some Youtube videos: steel axles seem to be considerably stronger than plastic ones, but in terms of strength to weight ratio it is not so obvious what is better?
  3. Davidz90
    Absolutely amazing. Good luck getting approved this time, unfortunately for some reason Technic submissions don't seem to fare well on Ideas. Great idea with starting from Mercury and gearing down from here, the accuracy is impressive!
  4. Davidz90
    Oh right, now I remember seeing that video :)
  5. Davidz90
    Wow, somehow missed the first post. This looks great!
  6. Davidz90
    Looks amazing! And so many functions. A video would be cool, especially to see the gearbox in action. I think I remember seeing some of these in Poland around 1990's :)
  7. Davidz90
    Amazing! Seems to work very well! I bet that it could be attached to electric motor and produce a measurable voltage. These panels are a reasonable approximation of turbine blades, although figuring out the optimal angle of attack for the blades is not trivial. The yellow one is also interesting, looks like the front of a turbofan engine. Some time ago I also experimented with using panels for wind turbine, but a vertical one. It has advantage of working regardless of the wind direction, but it was much less powerful than this one - I had to use magnets for suspension because axles had too much friction.
  8. Davidz90
    Another (and final) update. Now it is larger, with more realistic proportions and powered with 3 pullback motors. 20220708_101841 by David_Z1, on Flickr 20220708_101846 by David_Z1, on Flickr 20220708_101852 by David_Z1, on Flickr
  9. Davidz90
    Thanks! You are right, looks pretty similar. I tested several suspension options, this was the only one where I could fit everything at this scale.
  10. Davidz90
    Very interesting mechanism! The maneuverability is absolutely amazing.
  11. Davidz90
    My try to make a generic racing truck similar to the ones in Dakar rally. Features 4x4 drive + fake engine powered by a single pullback motor, which makes it rather underpowered :P 20220623_132710 by David_Z1, on Flickr and here are some slo-mo shots of transmission and suspension doing its work: UPDATE: finished the model. Now the engine is mid-front, under cabin, as it should be.
  12. Davidz90
    Amazing sound!
  13. Davidz90
    Currently the grandfather clock stays in my room. Couldn't convince my mother that it fits the living room XD Yes, I think that the last one might be the most accurate. Here are some results I got by recording the sound and measuring the time between ticks: test_1h_1 by David_Z1, on Flickr test_1h_2 by David_Z1, on Flickr First one shows the period. It is intended to be 1.6 seconds and comes very close to this, with about 0.02 second variation. The second plot shows how much clock time differs from reference time. As for what accuracy is feasible, there is an awesome Lego clock by Kei Abe. In one month of testing, it never exceeded 12 seconds of error.
  14. Davidz90
    A new escapement design. By using two wheels, I could make it symmetric, whcich should in theory help the accuracy. Initial tests are encouraging, I got a maximum of 0.5 seconds of error in a 6 hour test run.
  15. Davidz90
    Packing motors and battery box into such little chassis.. Impressive!
  16. Davidz90
    Very nice demonstration of carousel style death trap autoloader
  17. Davidz90
    Big project that took me a good portion of the last month. A large (182 cm high) tower clock. 20220608_090635 by David_Z1, on Flickr The clock face is a plate sandwich under slight tension 20220608_090610 by David_Z1, on Flickr The case is built like a cabinet, the mechanism can slide in/out like a drawer. This makes working on the mechanism vastly easier. Case is brick built, with four longitudal spars (technic beams) going through its length. 20220608_084451 by David_Z1, on Flickr The video:
  18. Davidz90
    Very creative use of pneumatics. Nice!
  19. Davidz90
    For anyone interested, I have made instructions:
  20. Davidz90
    Thanks! This idea is not mine, there are a few designs with threads, the rest is original though. Yes, the thread solution seems to be the most reliable.
  21. Davidz90
    Another striking mechanism, this one is much simpler and I believe that it is the most compact one ever built:
  22. Davidz90
    Maybe add 12 pins to the circular gear rack the hour hand is attached to and another lever, actuated by minute hand, that advances the rack by 1 pin? I agree that would be neat but regardless, this is a masterpiece.
  23. Davidz90
    Beautiful and impressively precise. I didn't expect motor rpms to be so stable.
  24. Davidz90
    About 7-8 years ago, I have seen some amazing Lego clocks on Youtube and decided to try it myself. Started with very simple things like this one: ...and it quickly escalated from that XD In fact, recently I've written two research papers on grasshopper escapement: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.103.062208 https://journals.aps.org/pre/abstract/10.1103/PhysRevE.105.055001 so one can say that I went from playing with Lego to doing actual science :D
  25. Davidz90
    Thanks! Yeah, it took me several weeks and many failed prototypes to get it working. Funnily, I decided to design my own striking mechanism because I felt that existing ones were too large and complicated, and this is supposed to be a "simple" solution (and it really is, with maybe half the amount of moving parts as compared to other solutions).
×
×
  • Create New...