Milan Posted December 19, 2011 Posted December 19, 2011 the linear actuars from fabione wil bi smaller ja sam casao oni zilindri od fabione so meinji i brsi We have small actuators directly from LEGO (LA, and mLA) The idea that Swissbager had was to build big and strong LA that would not twist under load and which could be used in his mobile crane. Quote
Starbager1 Posted December 19, 2011 Posted December 19, 2011 We have small actuators directly from LEGO (LA, and mLA) The idea that Swissbager had was to build big and strong LA that would not twist under load and which could be used in his mobile crane. ok yes wen you make a video Quote
timslegos Posted December 19, 2011 Posted December 19, 2011 Aww i absolutely can not wait for those videos!!!! Dont forget to post the links. tim Quote
Alasdair Ryan Posted December 19, 2011 Posted December 19, 2011 Here is the video posted by starbagger, Mayby you should start a new topic just for your model starbagger? Quote
Alasdair Ryan Posted December 20, 2011 Posted December 20, 2011 I have made a new custom La,feel free to post your comments. It works,i can make a video tomorrow. Quote
timslegos Posted December 20, 2011 Posted December 20, 2011 I have made a new custom La,feel free to post your comments. It works,i can make a video tomorrow. Nice build, it is very small! But as i have asked before, where how would it connect to a machine on the bottom end? How would the motor attach without interfering? tim Quote
Alasdair Ryan Posted December 20, 2011 Posted December 20, 2011 Nice build, it is very small! But as i have asked before, where how would it connect to a machine on the bottom end? How would the motor attach without interfering? tim Don't panic thats the easy part. Quote
timslegos Posted December 20, 2011 Posted December 20, 2011 Don't panic thats the easy part. Would you mind posting a photo? tim Quote
Alasdair Ryan Posted December 20, 2011 Posted December 20, 2011 (edited) Here are a picture of it in real life and a video. Edited December 20, 2011 by Alasdair Ryan Quote
timslegos Posted December 20, 2011 Posted December 20, 2011 Here are a picture of it in real life and a video. Ahh that is easy!!! it looks very promising! I will have to make one. tim Quote
Sisko Posted January 11, 2012 Posted January 11, 2012 I took a different approach for my LA: I do not recommend to use it for heavy duty because the gears could slip. Maybe someone of you can use this as an inspiration Quote
Alasdair Ryan Posted January 11, 2012 Posted January 11, 2012 Very simple idea,if you added braising to the connecter on the other side it would be bit stonger,but this would change the thinkness of it which would mean that it would be a bit on the chunky (love that word) side for moc's unless thay were in a big scale. Quote
timslegos Posted January 11, 2012 Posted January 11, 2012 I love that idea! Although how would the drive axle be attached to the MOC? tim Quote
Sisko Posted January 12, 2012 Posted January 12, 2012 I'm glad you like it I tried to build a Palfinger crane in a very small scale without pneumatics or prebuild LEGO LAs. But unfortunately it is impossible to get three axles (2x to lift and 1x to extend the boom) through a turntable if you have limited space... (I had one idea for this but it turned out to be hilarious ). Right axle: lift and lower the boom Left axle (with bush): extend the boom It is possible to extend and retract the boom at nearly any position because all of the four gears go in the same direction. This design was just a proof of concept. One nice thing to add: Both functions hold their position because I used worm gears as "stabilizers". Quote
timslegos Posted January 12, 2012 Posted January 12, 2012 Wow how on earth did you manage to make that work?! Nice job tim Quote
Alasdair Ryan Posted January 12, 2012 Posted January 12, 2012 In order to make a 3 or 4 section boom you will need to use thread like omn the cranes.But when making each boom you need to make each section as thin as posable. Quote
Leif Posted January 3, 2015 Posted January 3, 2015 This is an old topic and I apologize for bringing it up again if bumping old topics is frowned upon. However, the question is the same and the best answers, so far, seem to be in this thread. Parallell with the mobile crane project that we got going in the forum right now, the Grove GMK 6400, and the Efferman actuator for this as the current setup so to speak, I have started looking into building a mechanic actuator for a crane. I have built the more or less classic rack and worm gear actuator, but it can actually not stand more lifting than approx 1.5 kg before worm gear slips! See pic for principal setup. naturally gearing down at the other end of the actuator as well as a perpendicular setup or similar.. Any ideas for building a stronger actuator? As I understand there are some actuators being built that we still have not seen the details of, how they were made. Their strengt I do not know of though. I think that an 8 tooth gear towards the rack is more stable but we will add height to the actuator for sure, and it will be quite clumsy! Quote
Alasdair Ryan Posted January 3, 2015 Posted January 3, 2015 Swap the worm gear for a 8 tooth gear,then put the worm on top of that. It will be a stud higher but should give a better result. Quote
Bricktrain Posted January 3, 2015 Posted January 3, 2015 For my large crane boom and lift cylinder I had to use two gears driven by two worm gears to get enough force. It will lift the boom out of the cradle http://www.brickshelf.com/cgi-bin/gallery.cgi?f=486168 Quote
Leif Posted January 3, 2015 Posted January 3, 2015 For my large crane boom and lift cylinder I had to use two gears driven by two worm gears to get enough force. It will lift the boom out of the cradle http://www.brickshelf.com/cgi-bin/gallery.cgi?f=486168 That is a really big crane! Most impressive! I will look into the details of your build. Any LDD or similar? Quote
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