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  1. 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. Hi all, I made a larger (2-octave) version of this, together with a second video explaining how it works:
  3. aeh5040

    42112 Concrete Mixer Truck

    I think that's just a and a 1/2 thickness liftarm
  4. aeh5040

    Are Closed-Loop Systems Possible?

    No particular disagreement from me on that. But, some people want to tackle it because it's there!
  5. aeh5040

    [MOC] 12 Speed Rotary Gearbox

    Great stuff as always. But only 12???
  6. A few resources that might help: All technic excavators (possibly missing the last couple of years): Everything currently sold by LEGO is at I assume you know about You might get what you want cheaper than you expect there, and you can also boxes, instruction manuals, etc.
  7. aeh5040

    42112 Concrete Mixer Truck

    OK, now we are talking. I might (almost) forgive the only-two-pieces thing for this...
  8. aeh5040

    Chiron gearbox problems

    Yeah, it's very disappointing. Even rotating the gears on their axles by 90 degrees can sometimes help IME.
  9. aeh5040

    Chiron gearbox problems

    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

    Are Closed-Loop Systems Possible?

    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. 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. 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

    Are Closed-Loop Systems Possible?

    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

    Are Closed-Loop Systems Possible?

    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...