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Didumos69

Eurobricks Dukes
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Everything posted by Didumos69

  1. Didumos69
    I got the idea to take my Small Porsche as part I of a 'Small cute trilogy'. Not much Technic about this, but here is part II: a Seaplane. Maybe not the exact colors, but it is supposed to be buildable and well designed: LXF-file here.
  2. Didumos69
    That's indeed the only change in the video and it helps to reduce backlash. What I meant to say is that a few more things can be done to make the orange flaps to the side of the gearbox align perfectly. Not to mention the improvements that can be done to reduce friction in the drive train.
  3. Didumos69
    There is more to it: see Rebrickable.
  4. Didumos69
    When you'r interested in the minimal version or errata only, see Rebrickable for instructions and parts list. When you're interested in my ultimately playable version, then this is the LXF-file and this is the parts list. For more info and building directions for the ultimate version, see the OP (original post) of this thread. The ultimate version (LXF-file and parts list) does not yet include my improved paddle shifter unit.
  5. Didumos69
    My Porsche and other models have been banned from the living room, so I had to make a storage place for them. I still had two unused kitchen cabinets left (60cm wide) and the Porsche fits just perfectly. It shouldn't have been one stud longer: And to keep the shelfs in place I found a very practical use of the axle-pin connector :wink: .
  6. Didumos69
    The best I have is the LXF-file for my 'ultimately playable version'. It contains the model upto Box 2, both the original (left, drivers view) and my modded version (right, drivers view). It does not yet contain my paddle shifter unit mod. Furthermore I know efferman shared a file with the whole model (with substitutes for missing parts) in this thread a few month ago, so that means navigating through all the 20+ pages...
  7. Didumos69
    I love the dragster!
  8. Didumos69
    I had the same experience. I would even argue that the tension on the stepper silicon band should be substantially less than the tension on the limiter silicon band. Works out very fine. The two pushers operate separtely and are moved back into straight position without using rubbers or silicon bands. The paddle shifters operate way more smooth than in the original model :
  9. Didumos69
    Just added a post about a redesigned paddle shifter unit in my ultimately playable thread:
  10. Didumos69
    It's been a while, but after reading this post from Attika I got some inspiration to start improving the paddle shifter unit. I never really liked how it operates, even after turning around the change-over catches. It operates very rough and needs a lot of (silicon) power to return to its default position. I started with a variation on Attika's stepper. I found out that the pushers that I use in this variation are very strong and effective: There's no risk of axles sliding out off connectors and the pushers return very smoothly: So I decided to investigate whether I could incorporate the same pushers in the paddle shifter unit of the Porsche. And guess what, it works very well! Like Attika's stepper, the whole mechanism is a collaboration between pushers and a 90 degree limiter attached to the actual gear selector axle in the gearbox. I wanted to leave the limiter where it is (for it to be as effective as possible), so I built a test setup which mimics the situation in the original Porsche. That way I could test whether the pushers cooperate well with the limiter. And they do: The paddle shifters are now a real joy to operate! And as you can see the silicon bands don't need much stress to pull the paddles back. I also made sure the output axle of the unit can rotate freely and is not hindered by the pushers. That is necessary to allow the HoG shifter to operate the gear shifting train from outside the paddle shifter unit. And finally I tilted the steering wheel. I know DayWalker did that too, but his solution gives too much angle in my opinion. This is the essential part of the unit, you can recognize the pushers from the stepper video: Next step will be to incorporate this in my ultimate version LXF-file of the unit can be found here.
  11. Didumos69
    Nice cosmetic MODs and your gearbox looks just perfect!
  12. Didumos69
    Something similar, also uses a limiter. It uses a 3L lever : wink:. Btw, I tried using the limiter open ended like this, but it will slowly slide the #2 connector off the axle. Still a useful concept though.
  13. Didumos69
    Great wheel chair! I love this kind of to-the-point builds! Very original too! Now hand back the RC to this poor guy. He must be sick from being shaken around all the time
  14. Didumos69
    At the end of from a few posts above you see what happens when I drive the knob gear axle by hand. But beware that I have a slightly different implementation compared to Attika.
  15. Didumos69
    About unwanted rotation of the knob gear: The integrated limiter serves as a first line of defense; it makes sure the knob gear axle prefers to sit in perfect 90 degree orientations. It has proven useful in the 42056 Porsche to avoid double engaged gears. As for the exact locking behaviour of the complete stepper I think Attika has to answer himself. I have a slightly different implementation that is intended to slip through the stepper part.
  16. Didumos69
    I was actually extending your joke , but what you're saying makes sense. Which is very much appreciated! It operates so smooth that I can't stop playing with it. I have been driving my kids nuts with its clicking sound all over the weekend . I'm currently trying to figure out how I can use the same mechanism to redesign the PDK-unit - this thing where you've already won your spurs - in my ultimately playable version of the Porsche. This also explains why I see the slipping as advantage, as that version also features HoG shifting.
  17. Didumos69
    Thanks, this was the kind of comparison I was interested in. I already noticed the center diff, looking forward to seeing your next moc. Regarding the gearbox size. They say performance is more important than size, but I'd say eventually all depends on who operates the gearbox .
  18. Didumos69
    Thanks. I consider you as someone knowledgeable when it comes to LEGO gearboxes and was just being curious about your thoughts on Attika's approach, which also combines a stepper with a 4-speed seq. gearbox.
  19. Didumos69
    @Sariel, thanks for sharing this interesting piece of work. I have the following question: A much smaller motorizable stepper + 4-speed sequential gearbox has been posted by Attika a few days ago. Can you elaborate on the main differences between your solution and Attika's solution?
  20. Didumos69
    I didn't really explain, slipping is particularly useful when a HoG shifter drives the axle with the knob gear directly. In that case the HoG generates the gear changing torque, not the stepper.
  21. Didumos69
    Here you also see the intended slipping:
  22. Didumos69
    Added a video to my previous post.
  23. Didumos69
    I have been experimenting with this and my conclusion is also that you need a 5L lever to get the required reach. I don't have the special studded part with axle hole, so I had to use some different parts, but it works very smoothly. I used two red silicon bands, one wrapped twice around the limiter and one wrapped once around the stepper. I also added a block to avoid infinite shifting and I used a rubber connector (++) to get a better return to center effect in the manual version. I also checked whether I could rotate the shifter axle without using the stepper and I could. It simply slips along the stepper (but maybe this is because I used different parts). This is nice because it means it can also be combined with HoG shifting like in my ultimate vwrsion of the Porsche. @Attika, maybe you can confirm that your stepper also slips when the shifter axle is rotated from outside the stepper?
  24. Didumos69
    Not yet, but I will .
  25. Didumos69
    Cool color scheme! Makes it even more 'Rallye'.
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