crazy technic
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About crazy technic
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I have since bougth controll + sets, and I must say the compact form factor is much better for most mocs, at the time they where the only thing I had, and also they way my lego technic journey started: on my 10th birthday i got my first mindstorms ev3 set, after i build a couple of the models I imediatly started modifing and motorising everything, probably my first succesfull project was moterisation of the 9395 pickup tow truck, i unfortunatly don't have any footage of it, many other projects followed, during the pandemic I discovered gearboxes ( I was 11), I learned a lot about them, build many tutorials from youtube, and this project of building a truck started not long after, first it waqs just a 4x 4 truck, then 6x6, then 8x8, eventualy i stumbled upon this model and after rebuilding the chassis like 10 more times we arrived here -
I am very surprised with the 3rd place, since this is my first ever competition here , huge thanks to everyone who voted or took part. I was very impressed by other models as well. hopefully I will see you all again in the next edition
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here's the YouTube video https://youtu.be/xa6r7tEq3lM?si=yfzID2YdWwr46au7 And you can read more in the entry topic :)
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Liebherr R926 compact excavator in 1:21 I created this 1:21 scale model of the liebherr R926 compact excavator in Lego Technic it has 7 motorized functions, even though it only uses 4 motors 2 of them are in the tracks and the others are in the undercariage, there is a function switching gearbox in the superstructure driven and shifted by the 2 large motors in the undercariage the excavator uses around 1170 pieces, all original Lego. The fuctions : - driving (one motor for each track) - dozer blade, (manual but ads a lot of playability) - swinging superstructure, turntable driven by a wormgear - first arm section 2 linear actuators, - second arm section, 1 linear actuator - stick (3rd section) 1 XL linear actuator - bucket uses a pneumatic cylinder + pump + valve (all motorized ) - tiltrotator + quick attachment swaping ( manual but adds more functionality) - 2 bucket sizes and forks + pallet The model is filled to the brim with gears motors and functions, it takes up the entire rear of the model the speed isn’t exactly amazing but it does have quite some power the sycronization of the gearbox and the extra arm section compared to a normal excavator caused quit a bit of problems, but I managed to overcome all of them. In the end I really like the model it’s very playable while still looking great. this is what it looks like fully folded out at an impresive 50cm high ... … and fully folded in it’s a lot more compact . (it can get even smaller than this) If you read until here I hope you have fun building :) The instructions are in progress, check the topic for updates.
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thanks, I am curently doing the final tests if everything goes well I will start recording the youtube video, but since it was mostly designed digitaly instructions should be here quicker than usual, I was partialy inspired by a pneuatic version I saw on youtube a while ago, https://www.youtube.com/watch?v=0Jv1iHAKsAM&list=LL&index=9 even tho the outsides look a bit less finished the functionality makes up for that, absolutly great build and nice functions
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it uses a worm gear now, and i had to switch to the older turntable for that to work, but the turning is very smooth, the only problem is I can't film it because I use the same phone to operate it, but i have an actual camera for the YouTube videos, before I used the worm gear it used to get stuck, that's why there is the wheel on the front below the boom, that does help when it has to get over the hub in the rear(but is only supported there) also because the real machine has a dark grey stripe at the lower part of the superstructure, I accomplished that by adding tiles, so that makes the gap look smaller, but everything works perfectly fine, the driving is surprisingly fast but still strong enough for some off-roading.
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I first decided on the scale because most of my other models are in the same scale so they fit together, after that I chose sprockets and everything. coding works( I think) I just dicovered you can use varibles in the powered up app so that fixed most of the issues.
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thanks, but unfortunatly I am on vacation for most of the time left, so I pretty much have 3-5 days left to finish it, so hopfully that will be enough to film the youtube video, and fix the last part of the code
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it's indeed completely filled by the gearbox and electronics, so far everything works, but coding has been a bit of a issue especially the correction for the turning of the superstructure. it's pretty much finished, only a (manual ) dozer blade will be added to hide the motors a bit more, the rest works all motorized, instructions are expected end of August or September, since I had to change quite a lot due to not having the parts I will have to rework some parts of the digital model. here are some pictures of the model
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made some good progress in the last 2 days, I fixed all the issues with gears clicking, and now all the functions work properly, I also added a manual tiltrotator and quick coupler for the bucket, and of cource the second part of the boom and stick. not only the shifting is affected, but also the power to the gearrbox made the superstructure spin when there was too much torque, this was solved by driving the turntable by a worm gear, this however meant i had to use the old type of turntable, but at least now the other functions don't make it spin anymore :) I have also made a quick prototype for the pneumatic function, that currently seems to work pretty well, tommorrow I will try to do a bit more on that, unfortunately due to the size of this mechanism there will probably be no interior to the cabin.
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when I actualy build it I relized the distance is perfect so I decided to not use the track tention mechanism, I might still ad it again later.
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It actualy happend, I locked the axle where they motor should be and shifted by rotating the superstructure, but I knew it was going to happen, I am planning to use the magic of programming to fix it: only if superstructure rotation is activated the shifting motor compensaties, but I still have to do it
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Im finaly back, exams are over so now I have time again, 2 days ago I bought the Volvo 6x6 articulated hauler( mostly for Parts), build it yesterday, and took it apart again today and used the pieces to finaly get a actual model. I completly mirrored the entire build because it alows me to put stuff in the cabin, the rear of the superstructure if completly filled with a gearbox, and all the motors + hub are in the undercarrage. If I only used Linear actuators in would need 3 driveshafts going through the first part of the boom( which is probably impossible at this scale). That's why I decided to use motorized pneumatics on the bucket cilinder( reply if you know a other way) After being stuck in this problem for multiple weeks, I have finaly made progress again, certain Parts needed some changes but overall I mostly used the( mirrored ) digital design.
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here's another update, the gearbox is done, it consists of 2 parts: a motorized selected part, and manual part, the motorized selector selects option 4 and then you have to chose between 2 other functions, this was the only option to get 5 functions + a gearbox in this small space. and you will rarely have to switch between the 2 manual functions as one of them is hardly used (and optional in the real excavator) I also managed to build the dozer blade on the front, that will also be a manual function, because it wouldn't be possible to add more functions to the gearbox.
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I am also more and more leaning that way, also because I could add a extra manual gearbox part, so that the motorized switching engages one of 2 functions that are then selected manually, because the 3 remaining gearbox outputs aren't enough for 5 function
