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This page (and the embedded video in particular) might help clear up how it works. The only thing that's not obvious is which shaft is rotating at the input end, watching it a few times should make it fairly obvious.Making the clutches/brakes work properly would, I'd have thought, be the hardest bit, if using a 3D printer...
...Found this one: https://www.selmec.org.uk/article_0001_ravigneaux_planetary_transmission.aspxFig.3 shows the number of teeth of the gears, and that's pretty much all, that I need to draw a 3d-model of it....
Don, and all, on those old films, they really get to the point without any fuss I watched the M47 video, and there was so much good information, that at least for me, it takes some time to digest it. What comes to the current gear set that I'm working on, I'm not sure yet, which sun gear is attached to the center axle, and therefore delivering torque from the motor to the rest of the gear sets. What I suspect, is the 'K' one:I'll have to modify the drawings to make room for the'K' to have the grub screw. Not a big deal, as at the beginning, I just wanted to get the gear sets printed out, and while assembling, make changes as is necessary. Some of the gear sets were way too tight to fit together, so I printed consisting planet gears with 0,1mm offset, to make them rotate more freely.