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Attika

Eurobricks Citizen
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Everything posted by Attika

  1. Attika
    The green band I was using isn't Lego one, so can't give you a part number. I had a feedback from didumos69. He was using the red Lego bands: " I used two red silicon bands, one wrapped twice around the limiter and one wrapped once around the stepper." (quote from post No. 13) What I can tell, if you don't have those bands, you can experiment with non lego rubber bands. The principal is that the limiters band should be stronger than the steppers band. There is plenty of way to adjust them, wrapping them around the ball joint, or twisting it on the stepper. It might take a 5 minutes of experimenting to find the right combination. I couldn't resist seeing the demand, so here is a solution using original Lego silicone bands. White on the limiter wrapped around both ball joint once. DSC_2005 by Attika Moc, on Flickr[/img] Part on Bricklink: http://www.bricklink....page?P=x37#T=C
  2. Attika
    You should let the TLG know about it. I guess there are contact details on the paperwork anyway. As they've booked the shipping at the first place so they can make a complain at the shipping company and send you a replacement right away. Don't be shy on this, you deserved to have that display unit right.
  3. Attika
    Gearbox instruction is inserted into my first post in the topic
  4. Attika
    Sweeeeet Just looking at it warmed my heart.
  5. Attika
    Agreed. Tamás earned it.
  6. Attika
    I've been turning the gearbox around in the video to help this reverse enginering. I'm glad you made it. I think it is also visible on the video that I was using the red, frictionles connectors too under the driving rings. It wouldn't work with the white ones. Yes it is a 4wd gearbox that is why it has two outputs. I've been using the yellow connectors for outputs. If you need a 2wd conversion just substitute the differential with a 16 and a 24 tooth gear by using a connector between them. The red connector in the vid marks the input, but you can place the input to the other end of that shaft by changing the 3L axle with stop to a 4L axle. This is the very reason I did not align the stepper axle to the same level with the changeover catches. If you experience the problem that the ball joints are moving out from the changeover catches, then use a tiny piece of paper or something to make that connection stiffer. This is an actual prototype so there is or can be some design flaws. This gearbox isn't a "ready to publish" product, only a tool to demonstrate the stepper. Anyway I hope you can use it succesfully in your supercar, and sorry again I couldn't get around the gearbox video yet.
  7. Attika
    Sorry, I'm busy this week. Have to wait till the weekend. Thanks for the interest and the patience. I wish I was a child again...
  8. Attika
    I'm glad you like the concept. I've just came back from my holiday and the next step is to make the instruction vid for this gearbox and stepper. Hopefully I can find the time in the next few days to make it. I'll link the video to my first post in this topic, so keep an eye on it.
  9. Attika
    I know this problem, happened to my servos too. You have to take it apart and file the copper contacts and the metal pin what slides on them with a sandpaper. With time these copper parts gets covered with a layer of who knows what but it corrupts the conductivity. Same applies on rc buggy controller. I've done this on 4 or 5 rc controllers and 2 servos. All works fine. As a side effect it is possible that the treated device becomes slightly lauder.
  10. Attika
    I think I wasn't clear enough. Sorry. I meant if you were using not a straight connections from the motor to the wheel but a pair of gears (8/24 or 12/20) what slows it down when giving more torque. This way probably it could carry more weight on the way up. I just wasn't sure if the material itself is capable to take more without suffering any damage. I never built in this size so I have no experince. Don't get it wrong it isn't criticism but curiosity.
  11. Attika
    Sorry, I had an offline weekend. Nice application. I'm glad to contribute in your "big project".
  12. Attika
    Probably using a watermark or logo in the vids makes these frauds job harder. They have to edit it out (if they are capable to do it at all.) If it sounds stupid that is because I'm new in the business. I'm sharing vids to entertain, not for views or subscribers. Never had the intention to earn money (besides I am nowhere close to this by the numbers) so if this would happen to me I wouldn't stop sharing. But luckily I consider myself a small fish, hopefully far from this "danger"
  13. Attika
    Impressive size. I guess you've been experimenting enough. Did you make an attempt with a geared down version? I assume the plastic itself sets the limit of the weight it can carry. Amazing work. Grat.
  14. Attika
    Hi, as I wrote a couple of lines above if you use it a non motorised model there isn't enough countertorque to get it out from the gear. If you motorise it, using either servo motor or pf m motor with return to center mechanism, both holds the lever strong enough to prevent unwanted gearchange. I hope if you watch over the video concidering this explanation you will recognise the effect I wrote and the physics vehind it. I'm abroad right now therefore unable to post a video that highlights this. As you wrote this is a concept only so theres plenty of room to develop it to match certain requirements. Don't hesitate build it and experiment on it. You are free to use and modify it to your own taste. Thanks for poping in. By the way I'd be happy to see if you can improve it in any manner. And this applies on every reader. ;-) And now let me finish my beer :-D
  15. Attika
    Yes I got that.... my brother laughed too when I read your reply to him.... Looking forward how will you implement it in the porsche
  16. Attika
    This is the very first version of the stepper I came up with. Due to the lack of time (and the holyday) I didn't try to modify it yet. I'm sure with time it will evolve. Sariels solution has 3 years of development in it. My mechanism is barely a month old. No question that there is a difference in performance. My intention by sharing it in its early stage, to let others think on it and develop it. I belive that collaboration can take things further than contention.
  17. Attika
    Well, I'm glad you find the slipping as an advantage, what I basically concidered as a disadvantage ;-) I've read your question in Sariel's topic. As I see his solution is more suitable for high torque tasks, as my gearbox frame in this form made for a lightweight 1:8 middle engine (let say) supercar what will be powered by 2 rc buggy motors. That will be my next moc. As It is a 4wd model my gearbox has a central diff as well. Due to these reasons it wasn't designed to be capable to break parts. As I was pointing it out in this post and the video I was going to demonstrate the concept of the stepper what could be built on various gearbox designs. The gearbox you see in this vid is just one and irrelevant as it is only an asset of demonstration. The other question was the size.... Sariel is about the same age as me therefore it feels kinda funny to compare who's got the bigger..... gearbox. :-D (yes, it is meant to be a joke ;-) )
  18. Attika
    Using different parts certanly changes its behaviour. I'm far from my parts, so a can't confirm how much difference it makes. If you use it with servo motor you wont be able to turn the axle as the motor works as a break on it. If it is used in a non motorised moc there isn't any torqe that causes non wanted gear change .
  19. Attika
    crediting you is just fair in case like this. Should be natural. I don't have the red rubber ring, so I don't know if it fits for the job or not. The 5 long lever comes with certain advantages as a byproduct of its geometry. By pushing it to the end turns the knobwheel in exact 90 degree position, so the limiters only job is to keep it there until the next gearchange. of course I was experimenting with a 3L version, but did not satisfy me. Less accurate gear change, overall loss of reliability where it ended up. Still I encourage you to build it and experiment on it. One of the main benefit of this design is the smooth gearchange and the really small force that needs to operate it. Thanks for getting back. You are welcome, and thanks.
  20. Attika
    Sorry, I don't know why did the vid disapear... I've linked it again
  21. Attika
    Hello fellows, Let me present my idea for a stepper mechanism for sequential gearboxes (4 speeder). Please forgive me giving such a a short description, but I wanted to share this idea before I take of to my hollyday. I didn't even packed yet and I depart tomorrow So I'll insert the video and copy its description here. I'm going to try to get online every day and react on questons and comments. Finally let me say a big thank you for Didumos69 and his 90 degree limiter for the inspiration. This video meant to demonstrate the stepper, not the gearbox. The nature of this design allows it to be used with almost any kind of gearboxes. I'll make instructions for the gearbox later however I've been trying to show it from every angle in the video so you can attempt to reverse engineer it. It isn't that complicated. Stepper: I've got the inspiration from an other idea what Diederik van Leeuwen came up with. He goes by the name of Didumos69 on the Eurobricks forum. Click on the link below to see his post: http://www.eurobrick.../forum/index... The reliability of this stepper depends on the right rubber rings. For the limiter I was using the small lego silicone ring and for the stepper (the green ring) a non lego one that is much weaker than the white. If it is too strong it pulls the knobwheel back instead of sliding trough on it when it returns to the basic position. So find the right combination by experimenting. It requires the frictionless driving rings in the gearbox. The motorisation can be solved by using PF medium motor combined with return to center mechanism too. Sorry for the lack of quality, it was a hasty work. I hope the point I was gonna make gone trough. If there is any question, please use the comment section. I'll try to answer it as quick as I can. Thanks for watching an reading. Hope you find it usefull. There is a few failed changes in the video, those wre caused by applying shorter route on the handle. This design requires to be turned to the end point (about 65 degrees). UPDATE Gearbox instruction video is uploaded:
  22. Attika
    It is more of the style than the colour. However I have to admit that it is rare to see that much blue anywhere else, but hey, that could be the part of style too.
  23. Attika
    I've seen the picture of this beauty on a different blog, and without reading a letter I knew it is your work. It is a serious art what you are doing with those panels. And again hats off...
  24. Attika
    Cool!
  25. Attika
    Great to see someone else is interested in this subject. I had my attempt to replicate this kind of crane in technic in the same scale, but I had a different approach. I gave up the realistic mechanism for some aesthetcs and that is where it ended up : There is a tiny problem however... it has a bad back, can't lift too much.. :-D
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