MP LEGO Technic creations

@BondemandClausen, thank you! I'm honored that you, the author of the model that inspired me to build it the most, like it! I indeed researched your model a lot because there aren't that many brick built beet harvesters. It's truly a masterpiece, undoubtedly worth the Hall of fame and even more mindblowing when you realize that it was created like 10 years ago... I'd definitely build some things in a different way but only using parts that didn't exist back then. I decided to build it using a lot of system parts because I felt it'd be possible to include more details, smoother surfaces and hole-free bunker which was necessary to make it really working. The drive is provided by 2 C+ XL motors for each of rear axles and 1 C+ L motor for the front. However, as it's in 1:17 scale (I believe that yours is 1:15?), there's even less space for everything, so it wouldn't be possible to make it move without those planetary wheel hubs. And now it drives fine, even fully loaded with about 5.500 1x1 bricks as beets and weight of about 10 kgs... The problem was to find place for 4 C+ smart hubs, yes, they offer proportional control of all motors and many other things but also downsides like one motor per port (in the end, there are 3 motors for drive and 4 motors for steering, which makes only 9 other ports free - of which 2 are used for lights, connected through a reduction C+toPF with more pairs of lights). I hope some day we'll see these two machines (and of course the Maus) together!

Thank you, I'm really glad you like it! My intention is indeed to make the best-I-can replica of the real machine. This long-term project has also its advantages, as TLG already released some parts in the exact colour needed, that weren't available when I started it (for example 36841 in DBG or 4285b in yellow). I usually try to use parts that haven't already been discontinued, finding all those long yellow rigid hoses for a reasonable price was tough though And here comes the functionality aspect. The plan was to make the machine actually pick up 1x1 round bricks as beets, which still is my priority. However, this causes also some troubles that weren't expected at the very beginning. Some of them were already solved, some haven't been yet and some are still to come. I hope I'll manage to improve a few things before the next week's update, I've also started working on the 'harvesting header', which will be unfortunately undetachable. I've clearly stated the deadline for this project, which won't last longer than the end of 2023. I hope the missing parts will be released at time... Anyway, this harvester won't be alone, I've made a significant progress with a trailer (in dark turquoise) and a Mindstorms-powered autonomous (or at least containing some sensors) tractor is also on its way. I'll probably have to start with programming In this case, @Milan, should I start another topic for the tractor and the trailer?

In case there's someone who'd like to know some further progress on this one. As quite a long time passed from the last update, a lot of things were added/changed since then (I need to sum up the changes in my mind a bit ) Meanwhile I've taken a shot for comparison with a real beet, hopefully a photo with the real machine will be taken one day... A proper update will come in the next week, sorry everyone and thanx for patience!

Is that the JCB 220X LC excavator?

@Void_S I tried it in reality and not much more force than for the previous assembly was needed. However, I agree with you that for some builders this could've been an issue.

It's great to see that it was assembled on purpose and I fully respect your solution Anyway, I'd still go this way, which works exactly the same but to me seems aesthetically better (might be just a matter of taste).

@M_longer That looks great! However, as I watched the video, I noticed a quite unusual use of parts right above the turntable, specifically: and For me this placement doesn't make much sense, because I'd definitely replace them with each other, so the 3L frictionless pin would go the all way through the 15100 pin, the frame and the turntable and I believe that would make the connection more stable. Anyway, superb use of provided parts and some very good ideas! EDIT: Described part is well visible at 1:10 (time)

Why don't you use this inserted into that 2780 pin? Maybe I've overlooked something but if not, this connection should be fine.

Indeed. I wanted the outriggers to extend by 90 degrees (like in the A model) but that didn't bring much stability (like in the A model) because the outriggers started to retract under the model's weight once the chassis was tilted a little. So I abandoned this idea and started thinking about a different mechanism where the LAs wouldn't be loaded with the model's weight when extended. This ended up with something completely different where no linear actuator was used at all and worm gears instead. I'm glad you like it!

It looks great, good parts usage! The green 6x6 tile looks way better here. I especially like how this model merges functions of both tractor and trailer into one machine (that doubtful trailer's suspension not included).

You're absolutely right Anyway, I've just found your first alternate model, too. However, this left me with 4 small LAs unused, as those were too weak to use instead

This also came to my mind but in fact, that doesn't make sense that much because real cranes sometimes need to only tilt their cabin, without lifting it.

In fact, there is no marvel going on here... The red thin liftarms are powered and the blue one belongs to the frame. Hope this schematic is understandable. That's indeed my favourite function Maybe I haven't clarified this above but the extension mechanism uses 2 long thin pneumatic cylinders (one for each section), so one string is still left unused... (the other one had exactly the wanted lenght to reach the ground even from the full height so no tying was needed) Yes, you're quite right. It's enough when the boom is retracted, fine when extended, OK when extension mounted but putting more then 100 - 150 grams of weight is starting to be way too much for one cylinder. Of course, I could've connect the cylinder in a different way but then the angle of fully lifted boom was too little, though the force had increased. I'd also prefer two cylinders for this but the set provided only a single one. Thank you! As the set didn't have only one main colour, making a B-model which wasn't rather speckled was indeed a nightmare

Thank you! I took the idea from this (it doesn't seem to be a common feature, though). Anyway, I decided to go this way because there just weren't enough parts to make a good looking (to me) standard mobile crane with 2 cabins...

Hello everybody! I'd like to present you my very first alternate model, built from parts provided by the 42128 set. I started building this one because I wanted a new challenge, something different from builds I usually do. The model uses about 85% pieces (some spare parts included). It took me about 3 days to build and I'm quite happy with the result (since I haven't done something similar before, I don't know whether I should...) Maximum height of the model is 71 cm. Anyway, here are the features: 3-axle steering with proper geometry Working fake engine connected to 3rd axle Front and rear outriggers Manually rotated superstructure Cabin lifting Cabin tilting Cabin's boom extension Folding right rear view mirror together with main boom's transport support Winch with a ratchet mechanism Pneumatically elevated boom Pneumatically extended two-stage boom External boom's extension Any feedback is appreciated. And a video:

Exactly my thought

I also thought about this but the hub already has the "new" style of pins, which means that it's no more possible to insert a bar (just like with a 3l pin with friction ridges and many other parts).

This might work but as the wheels are also steered, I can't make the axle narrower - the +2 studs would've make it wide enough to stick outside and collide with surrounding parts. I'm also not sure if additional part between the wheel and hub wouldn't cause additional bending. I'm sorry that I haven't written complete information above This may be a solution I'm looking for but I won't use it until it turns out that there's no solution using only LEGO parts. Anyway, thanks for ideas!

Is there anyone with an idea how to make connection between a wheel racing medium and a planetary hub even stronger (not considering use of glue)? The thing is, as I'm building quite a heavy machine, the wheels tend to disconnect when cornering. Approx. weight of fully-loaded model is 9 kg divided (not equally) onto 3 axles. Any suggestion is highly appreciated.

I'm the next one who's interested in this one. I've just realized a funny thing - a yellow machine won the gold medal, a white machine the silver one and a red one bronze. Maybe there's something about it....

Congratulations to all participants, @Akassin and also @Thirdwigg for collecting the last piece of puzzle I believe that all contests are not strictly about winning but about gaining experience, trying new things and the most importantly - doing something that we enjoy and having fun! Every contest is as tough as the competitors themselves make it and I enjoyed this one really much. Of course, it's a contest so there are winners and the others but this shouldn't discourage them, there's always place for improvement and the next time, it can be everyone else of you to win. I suppose that if this contest wasn't organized, I'd probably never make a build like this (which would be quite a shame as I like it a lot) and I even didn't know of this machine before. I'd like to thank @Jim and @Milan for making this amazing contest come true and thank them for the effort they put into the whole managing of the forum And finally, I am honored by every point that any of you awarded my contribution.

24: 10 6: 6 26: 4 9: 3 3: 2 22: 1 Well done to all participants!

For a while, I believed that there actually was a new frame similar to the one from McLaren. My mistake, that was actually a flip-flop beam.

First M is right above the L one, second is on top of the whole structure at the back and the last one (I believe) is placed vertically between the LAs.

In fact, it is actually a wedge belt wheel with a tyre. The new type of steering wheel doesn't hold the clips in defined position and needs an additional support. The result looks how I wanted to but I'm not completely sure if it'd be suitable for your model. One more thing - if you let those clips attached to it for longer time, the tyre won't be useful anything else, then.