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aeh5040

Eurobricks Knights
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Everything posted by aeh5040

  1. aeh5040
    Thanks! A babbage difference engine has been done: I'd love to replicate that, but I don't know how! A harmonic analyser might be fun (and the differential mechanism here could be part of it...)
  2. aeh5040
    Hi all, I made a larger (2-octave) version of this, together with a second video explaining how it works:
  3. aeh5040
    I think that's just a and a 1/2 thickness liftarm
  4. aeh5040
    No particular disagreement from me on that. But, some people want to tackle it because it's there!
  5. aeh5040
    Great stuff as always. But only 12???
  6. aeh5040
    A few resources that might help: All technic excavators (possibly missing the last couple of years): http://technicopedia.com/excavators.html Everything currently sold by LEGO is at shop.lego.com I assume you know about www.bricklink.com? You might get what you want cheaper than you expect there, and you can also boxes, instruction manuals, etc.
  7. aeh5040
    OK, now we are talking. I might (almost) forgive the only-two-pieces thing for this...
  8. aeh5040
    Yeah, it's very disappointing. Even rotating the gears on their axles by 90 degrees can sometimes help IME.
  9. aeh5040
    The 20t double bevel gears (the tan ones here) are not good, unfortunately. They are really too wide, and in addition there seem to be further problems with the more recent molds. It's certainly not a good design to have two of them touching like this. I suggest swapping them over, trying different orientations, and seeing if you can give them a bit more space by playing with the surrounding support structures. And yes, it's sad that this is necessary.
  10. aeh5040
    Hydraulic means using an incompressible fluid (i.e. a liquid), which is probably not a good idea with the LEGO pneumatic parts.. Pneumatic means using a gas (e.g. air). However, yes, a closed loop is what you would need for a hydraulic system.
  11. aeh5040
    I think it must involve friction somehow - even a worm does. But it's very surprising. I will indeed try building it (or a variant)...
  12. aeh5040
    That's quite amazing. I was going to reply that I thought it was impossible without a worm... Do you understand why it works?
  13. aeh5040
    What I was talking about (and I think what the OP may be talking about) is a 4th possibility: a pneumatic system in which there is no input or output of air (so the air could in principle be replaced by some other fluid). This has been investigated and done.
  14. aeh5040
    Closed-loop pneumatic systems definitely can be and have been done in LEGO. Several people were experimenting with them in the early 2000s IIRC. I think there were discussions in the old LUGNET Forum - I don't know how easy they would be to find. The basic idea was to use multiple switches mechanically linked so that the hidden fourth port is never connected to anything...
  15. aeh5040
    Right, I couldn't understand that, either. Are you sure it is not just operating under friction in the middle speed? If you try to stop the output turning with your fingers does it stall the motor? Seems like I need to try it too....!
  16. aeh5040
    Of course differential housings have been used to transfer torque concentrically like this before, but I haven't seen it used in a gearbox quite like this. Very neat and interesting! In particular, Jennifer Clark used the diff technique in the 90s(?) to get two functions through a turntable a decade or so before TLG caught on to that idea.
  17. aeh5040
    It looks as if it should to me, too. Are you sure it doesn't?
  18. aeh5040
    Happens all the time
  19. aeh5040
    So, if the drum is 6 pieces (cone, cylinder, cone, each divided into 2 halves), I can see them being useful elsewhere. If it is just 2 halves then all I can say is
  20. aeh5040
    Very interesting! I've never even seen that dish part before.
  21. aeh5040
    Looks impressive. Maybe should be in the trains forum though?
  22. aeh5040
    Could be some interesting new parts possibilities here: https://brickset.com/sets/41430-1/Summer-Fun-Water-Park
  23. aeh5040
    Great work!
  24. aeh5040
    Very nice module - clean and robust. I have thought about supplyling power this way. It would be interesting to see it developed further.
  25. aeh5040
    You need to get some LEGO motors!
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