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aeh5040

Eurobricks Knights
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Everything posted by aeh5040

  1. aeh5040
    This is very nice and a very original style!
  2. aeh5040
    That is indeed how it works, although it is nothing to do with divisibility of 360. Dividing a circle into 360 degrees is simply a convention for describing angles - it has no bearing on physical reality. You could measure angles in any units and divide a circle into any number of equal parts. Although the design is quite simple, I actually find the simplicity quite pleasing in its own right. And the way the reverse selector bypasses the gearbox is neat. I agree that the drums are rather specialised, but I can still see them being useful elsewhere. Three-way selection is a useful concept in general. Just being able to offset an axle by 40 degrees (via the red one) could be useful, without even using the selector groove.
  3. aeh5040
    Cool - we can now indeed clearly see that the axle are at different angles on the two sides of a selector cylinder, together with the ABC and 123 labels used to align them correctly.
  4. aeh5040
    The offset axle holes within the drum seem to be visible in the top picture here:
  5. aeh5040
    Unfortunately we can't see your picture in the UK. (But I'm assuming it's the underside view from earlier). That's very neat if the reverse gear skips the gearbox like this! The differential connects via a 20t via the red 16t idler near the middle of the picture to a 16t hidden below the upper shaft in my picture. So yes, indeed, the red side's bottom axle.
  6. aeh5040
    I think the red and yellow drums must have two non-aligned axle holes on the two sides, to achieve the necessary rotational offsets. (Apologies if this has been mentioned already). It feels like a bit of a sneaky trick, but it is the obvious solution to the problem.
  7. aeh5040
    Yes, indeed, it presumably could have been much more compact, but besides authenticity (which I haven't looked into) it's nice and understandable this way. The reverse mechanism is off to the left of this picture - I don't know exactly how that works.
  8. aeh5040
    I think I mostly understand how the gearbox works. The 6 drums all move together. The yellow ones engage in 3 consecutive positions out of 9. The red ones engage at 3 equally spaced positions out of the 9. At any time, exactly one of each is engaged. The drivetrain passes from a shaft hidden from view running underneath the lower of the two visible here, and passes via one of the 3 clutch gears visible to the lower shaft, giving ratios of 8:24, 16:16 or 24:8. Then it passes to the upper shaft via one of the clutch gears there, giving either 14:18, 16:16 or 20:12. These get multiplied to give the final ratio, which is: approximately 0.26, 0.33, 0.42, 0.78, 1.00, 1.25, 2.33, 3.00, 3.75. (The image is an AI-enhanced still from the video, so may have weird glitches!)
  9. aeh5040
    18t and 64t should mesh at the 5,1 diagonal point. (Slightly tight, but OK). Other good diagonal meshes on the regular grid are: 14/8 at 1,1 14/36 at 3,1 14/56 at 4,2 18/18 at 2,1 18/40 at 3,2 18/64 at 5,1 And existing ones with the 64t: 8/64 at 4,2 28/64 at 5,3 36/64 at 6,2 60/64 at 6,5 The 8/14 mesh at the 1,1 diagonal looks by far the most useful.
  10. aeh5040
    People will always find something to complain about!
  11. aeh5040
    No, I don't think so. The 14/18 combination appears in the body of the gearbox itself, not in the control system. The purpose is simply to provide a different intermediate gear. I'm guessing that the 1/9 rotation is handled by the new red and yellow cylinders having their grooves at unusual angles relative to their axle, although it's not so clear exactly how. The cylinders are connected directly to the new 9-position detent wheel.
  12. aeh5040
  13. aeh5040
    Indeed, I noticed the same thing. I think the mesh should be fine. 20t to 24t on a 2,2 diagonal works, and that has exactly twice as much extra space. I think the yellow ones must also be one-sided. In the above picture they are linked on the upper side to the new 14t gear (which is not a clutch gear) in one case and an ordinary 16t in the other.
  14. aeh5040
    Another view of the new 14/18 gears
  15. aeh5040
    So if I'm understanding it right, the red selector cylinders only go to one side of centre, not both sides. At least in the WIP pictures, they are always paired with one clutch type gear and one ordinary one. Edit: maybe same applies for the yellow ones.
  16. aeh5040
    OK, you folks were right. Woohoo!
  17. aeh5040
    Nice find! If it's in the GWP then surely it must be in the set too.
  18. aeh5040
    Not convinced but I hope you're right!! 5 new gears in one year would be extraordinary!
  19. aeh5040
    Isn't the white part just a I think I see what you mean, but the diameter seems identical to a 16z, judging by where it reaches up to relative to the adjacent pin holes.
  20. aeh5040
    Seems very plausible. Meshing with a DBG 24z below it. I think that is just a standard LBG 16z.
  21. aeh5040
    One thing to note about the spokes: although they are offset along the direction of the axle, so that they splay apart from the wheel (like a typical real bicycle wheel), they appear not to be offset in the radial direction (unlike a real bicycle wheel). In other words, the line of the spoke would intersect the axle if extended. This has implications for wobble. If there is enough tension then the axial offset should prevent side-to-side tilting. But the absence of radial offset means a lot of rotational wobble or backlash. In other words, it will likely be possible to roll the wheel quite a long way without turning its axle. This shouldn't matter too much for the bike, but may have implications for powered use of these wheels.
  22. aeh5040
    I'm afraid that won't tell you anything about meshing the new 64t with a 24t. The point is that 24+64 = 28+60, so the required distance is the same. As I wrote above, the required distance is the (2,5) diagonal plus about 0.11 units. Unfortunately, that 0.11 makes for a tight fit.
  23. aeh5040
    The 24t / 64t combination is equivalent to 28t / 60t (the latter being the newer turntable). I just tried this at the (2,5) point - it does turn but when braced on both sides it is quite tight, with a lot of friction - not good for most applications. It is possible that it would be slightly better with pure spur gears as opposed to a double bevel (as seen with the new 12t and 20t spur gears), but I suspect it will be still not ideal.
  24. aeh5040
    No need to wait for that - it's just Pythagoras!
  25. aeh5040
    The all important 8t / 64t is the same spacing as 36t / 36t. I just tried this at the (4.2) grid point and it works nicely - not too tight for most purposes.
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