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Found 49 results

  1. Well, so now we have seen some reviews of the new LEGO models, and modifications and improvements of the other ones, and i think its time for the 42055, so lets start: My first modifications would be improve the force of the bucket, because as far i could see, the bucket is driven by the chains of the conveyor belt, so even an small object is able to stop it (like Sariel showed in his review), i would put an axle going from the gearbox directly to the bucket, or even a motor behind it, so there would not be too much power loss. Another modification i would like to do is in the tracks, i would like to put an small gearbox in the lower frame (i think there is enough space there), to select between some driving types, maybe something like a subtractor gearbox. And for the last, i would improve the turning system of the lower conveyor belt, as we can see in the review of Sariel, there is an small backlash in the system when the excavator changes the turning direction. So post any more idea or suggestion you have for this huge and impressive set.
  2. This MOC was built after 2 other attempts, 2 years ago and these didn't work. (I can explain a little the reasons if someone is interested) The design was difficult to do because of the round shapes. But I think the result is so good. You tell me ! The functions are : Left track Right track Blade Rotation of the turret 1st section of the arm 2nd section of the arm Moving the bucket Rotation of the arm (right/left) Opening/closing the clamp (pneumatic) All the functions are powered by M motors, except the rotation of the turret. But there are 9 functions, and it is possible to control just 8 functions with the IR system. How it's possible ? It's quite simple ! A gearbox allows to choose between "rotation of the arm" or "opening/closing the clamp". The chassis is very compact. It has 4 motors and 1 IR ! The mechanism of the rotation of the turret is not visible (the turret is too compact ! ^^) The rotation is quite fast (not too slow). Here you can see the motor actioning the 1st section of the arm. The motors of the 2nd section of the arm and the bucket are placed inside the arm. The last motor is placed in the middle of the chassis. It actuates the gearbox and you can choose the function to activate. With the clamp, there are a bucket and forks.
  3. A month ago I decided to make an excavator, first I was thinking about a mechanical powered one, but later I realized, that The mechanic cylinders are not that much powerful as I need. So I decided to do a pneumatic powered excavator. I had to buy the Lego Technic 42053 excavator because I needed the two biggest pneumatic 19478 cylinders to lift up the bang, one for the arm and fourth to move with the bucket. This excavator is based on pneumatic system v2. Its half rc and half manually controlled, that's sometimes hard if you work with it in terrain. In a few months, I am planning to build an updated fully rc version. Here is the video of the excavator: Parameters: length: 36 cm Max dig deep: 18cm Width: 17cm Max speed: 0.28km/h Weight: 1320g Electric motors: 3 the tracks mechanism The cabin
  4. One BuWizz, it's good. But two, it's better, because you can make MOCs having 8 functions! I have already done a full RC compact excavator, but with LEGO IR receivers. I wanted do make another excavator without the gearbox allowing to choose between the rotation of the arm and the pneumatic pump. Furthermore, the M motors were just enough powerful to move the arm. On this new excavator, it's different. I tried to make the mecanic as compact as possible. And the arm is controlled with more powerful motors: 1 L and 1 XL. So now you can... dig on gravel with a GoPro attached on the arm, and the motors bear that easily! There is a good speed and so much power to do anything you want! For the design, I tried to cover the maximum and I kept a color scheme close to the one of my previous excavator. To switch on the BuWizz of the turret, you need to open the part behind the cab. The hood is also openable, but there is nothing interesting to see. ^^ So the functions are: -> Controlled by the bottom BuWizz: Left track (M motor) Right track (M motor) Blade (M motor) LEDs (of the cab and the arm) -> Controlled by the BuWizz of the turret: Turn table (L motor) 1st part of the arm (XL motor) 2nd part of the arm (L motor) Bucket (M motor) You have certainly noticed that there are shock absorbers. It's for the tension of the tracks. The LEDs: And the video! The BuWizz are in Fast mode and I used the app BrickController, done by @imurvai. It's perfect for this MOC!
  5. Hello, I present you my latest model: Starting from the 42053 set, I decided to add some improvements and make it remote controlled with linear actuators and PF. The undercarriage is very similar to the original, with manual functions. Main mods are double wheels, and some aesthetic adjustments. The Power functions components are located in the upper-structure, except one motor which is in the boom. 1M motor for rotation of the upper-structure 1XL motor for the main boom 1M motor for the third section of the boom 1M motor for the bucket There is also a fake linear actuator to adjust the second section of the boom. I used this solution because this adjustable boom is more common in the real EW160E. Changeable buckets with quick-coupler: Access to the battery box: Power button with easy access: More photos: Video coming soon!!
  6. I would like to present a 1:48 scale model of one of the largest hydraulic mining excavators in the world. This machine has been previously known as Terex O&K RH400 and Bucyrus RH400, and currently it is called Caterpillar 6090 FS. However, this model uses the preceding Bucyrus livery. The model has the following remotely controlled electric functions: Propulsion; Slewing; Boom operation and opening of bucket; Rotating cooling fans; Folding ladder; Retractable service station; Lighting. The model has a remotely controlled gearbox which distributes motor power between two sets of functions. The scale of the model is minifigure compatible. Thank you for your attention!
  7. Hi Guys, just signed up Eurobricks, I am not new to this website though. But glad to be able to discuss and share with lego builders around the world :) Here is my recent work, a transformer (actually it is more like an animation )check out and give me some feedback :) Axcavator - Lego Transformer by David vc, on Flickr
  8. Old topic link. After 3 month of topic, after 3 years of old ver.1, FINIALLY finish ver.2 model.(because I have lot's of other work lol) Anyway, see video first. I will upload photo later. Function is same with old version but work with ONLY 2 L motor insted v1's 2 M motor. Function is selected by upper structure poistion. 1. Drive Forward when arm point forward, backward when arm point back. Faster than v1. 2. Steering Different with ver.1, Steering working when arm point right(old left) 3. Dozer blade up/down Um... can I say that is up/down? Anyway, working if arm point left(old right) 4. Turning When remote's blue lever is forward, turning upper structure. 5. Bucket/Second arm When remote's red lever is backward, bucket and second arm start working. Simple than v1 and move larger than v1. When remote;s red laver is forward, under structure function(function 1~3) is working. 6. Main arm When remote's blue lever is backward, Main arm is working. Slower than v1 and move larger than v1. Entire excavator is much smaller than v1 and move little more faster. and used so much pinhole with 1L pin
  9. My Truck sucks.....not. This is a function which i can not replicate Picture Source I am building these things since 6 years in real and the new double length pneumatic actuators now make it possible to build a lego one.
  10. Here I am again. This time the subject is one of the very usual kind: one PFS IR commanded excavator. They are many exemples of perfect excavator on the web...but I just wanted mine, of my own design. So I study it from A to Z and I had to answer many of the questions that many people answer before.Surprisingly, I do not answer the same at some of them :) But first this is what we are talking about: This model as been design in one only goal : a maximum of fun to play with it. In order to match that goal, each and every motor Is directly connected to each function. No mechanics in there. The function are ultra classical : drive, steer, rotate and the 3 movements of the arm. I make use of L motor for the tracks and lifting main arm. Other are medium size motors. I also choose to keep it as compact as possible. The main issue I find on many creation on the web is a too big body resulting in a too big arm. Too big arm need lots of power and often be very slow to move. I try to get what I think is the best compromise in size and use of existing motors. (No pipa I do not have RC ones :) ) The tracks gives the global scale. As you see the BB is in the lower part of the structure. This is due to compactness of the upper part but also for better design of this last spoken upper part. As the excavator rolls only on flat surfaces, no use of any suspension in it... view from the downside the tracks are well integrated, and even with the BB there is a good ground clearance of 3T wich is very good. I also try to implement good action range at the arm: And also small details that makes it looks good, like 3 sets of lights, toolbox, ... Back view, easy acces to the BB to swictch on/off and replace (often:) ) batteries The top part is designed so replacing M motor by Large one is easy (I do command two of them, awaiting arrival) So here it is, not the Moc of the year for sure, but sometimes it's good to achieve some simple goals. As expected and designed for, this one is very fun to play with. Hope you'll enjoy it Steph.
  11. The Lego set 42030 Volvo L350F is one of my favorite sets. I love the playability, but I wish there were more Volvo vehicles from the same series of earth moving vehicles that were equally playable. I happen to have a second L350F bucket kicking around from a second set purchase to make a A40 dump truck. I wish I had the Lego motorized excavator, but I have parts and this is Lego after all, I'll just make one. The first check in my mind is the bucket size. The L350F bucket is a spade nose rock bucket with teeth and segments. In real life this bucket is 13 feet wide and holds about 9 to 10 cubic yards. The EC750E's largest bucket is a general purpose earth moving bucket with a capacity of 9.34 cubic yards. It's width is unspecified(in the EC750E brochure), and while it will not be a spade nose bucket, the volume is close enough that maybe this could work. The first thing I've done is to figure out if/how the loader bucket could be used as a digger bucket. My initial scale is 1 stud width = 6 inches based on the 750mm grouser being 30" (2.5') or 6" x 5 being a good match for the Lego track being 5 studs wide. We'll see if I stick to this roughly 1:30 scale in the end. I'm going to document the build here: and discuss the problems that come up in this forum. Here is the first proof of concept on the bucket/arm/boom.
  12. Anybody have a build to share that has quick latching on the bucket or accessories? At work, our catepillar excavators have quick latches on the arm so they can attach small or big buckets. Some times even hydraulic rammers. Has anybody cracked at this quick latch system so they can switch buckets? I'm currently stuck trying to figure out how to have the front tilt + side tilt + spin + quick latch mechanism all built in one.
  13. This is one of my old MOC(least 1 year ago). A 2 motor wheel excavator. All 6 funation is work by ONLY 2 M MOTOR. 1. Drive forward/backward when arm point forward, drive forward, point back, drive backward. 2. Steering when arm point left, steering working. Moving by crank mechanisem so steering is repeating left->right->left.... 3. Dozer blade up/down when arm point right, dozer blade start working. This is also moveing by crank like steering so repeating up->down->up... 4. Upper structure rotation this function is linked with main boom up/down. 5. Main boom up/down crank(skip) 6. Second boom/bucket this function is linked with down structure working function. crank(skip also) No photo because that is so old moc. And I will make v2 of that.
  14. Hello All, As I love excavators, I couldn't resist to post these photos of my 4 excavators together, just for the fun of it. It's the 8294, 42006, 42053 and the 8043 with modified stick and efferman bucket. Hope you enjoy the photos And a last photo of the modified stick (sorry for the color vomit, I don't have those yellow panels) Feel free to comment Greetings
  15. Hi everyone, I would like to present my latest excavator (I guess I'm obssed with them). This time it is rope shovel excavator loosely based on Menck type Mc (1,6m3 volume of bucket). Such excavators were common till the hydraulic excavators started to rule in 60-70'. The larger types were mostly used in mines (and they are today used as well), but smaller types were used in all sort of works in constructions. My model is equipped with one L motor and gearbox with 6 motorized functions: 1 - boon elevation with rope 2 - arm elevation with rope 3 - arm extension with shaft drive 4 - rotation 5 - left tracks 6 - right tracks Emptying the shovel is done manually. I wanted to build the machanical aspect of the machine as closely to real machine as possible, however the arm extension was not possible to recreate. On most excavators the extension worked with third rope drum and the rope for extension and elevation was shared. This system worked in lego only for substraction and not extension as this was usually done by the weight of the shovel. Some excavators (mainly steam and electric) used another motor directly on arm for forced extension/substraction. However I wanted to stick with one motor only as it was my intention to see how complex gearbox is possible to make. As you can see from the video the L motor has no problem to drive 2-3 functions at once. The movement of tracks is very poor, but that is given by usage of small wheels that are not really suitable to serve as the only wheels driving the tracks. The smaller tracks would be better, but I don't have them. This time I really didn't bother much with aestethics so it is just bunch of panells, my main focus was on function. IMGP4995 by Ivan Moc, on Flickr IMGP4993 by Ivan Moc, on Flickr IMGP4992 by Ivan Moc, on Flickr IMGP4991 by Ivan Moc, on Flickr
  16. Yet another little excavator. Jono Rocky's model was great, but one main thing I wanted to add to that model was some functions to the undercarriage. Then Efferman started his Liebherr Compact 926 project and figured I could add another cylinder to Jono Rocky's arm. This is the result: As you can seen, also used the standard Liebherr colours. Yellow and DBG just happened due to the panels at the rear and the colour of pneumatic switches and I figured I'd use white for the cab instead of "yet another black cab". It isn't scaled to existing Liebherr though. Functions: - Full functional pneumatic arm - Pneumatic dozer blade on the undercarriage - "L2" engine (let's say it's a little "out of sync" though more on that later) - Full 360 degree turn with controls at the rear I was pretty surprised the blade holds the entire model up, especially after every single cylinder on the arm nagged about hoses not being the right length or in exactly the right position. If anybody has any suggestions to make the hoses less stiff (some kind of oil?), I'd love to hear it, because this was just stupid. These panels just screamed: use me here and never ever remove me from this place I added a second pump to the undercarriage so the superstructure could turn 360 degrees 1millmeter of play between the gears+axle and hoses I actually wanted to add another function: cabin lift, but besides having a lack of space behind the cab for this (hoses) it would have a serious negative effect on the support of the arm. So I dropped this idea. I didn't really like having the controls for the turntable stick out at the rear so much as this, but I had no room for other solutions. I tried lowering the "knob" one stud so it wouldn't have to be that long (it's this long so it doesn't collide with the superstructure while actually turning). I tried looking for a way to make a sliding mechanism, but there was simply no room. So I settled for this third option: removable and click it elsewhere on the body. I didn't try to close up the whole rear with tiles, mainly because the hoses ruin any type of mounting points available. On the other hand I like seeing a bit of "the guts". Especially when I spend quite a few evenings on these "guts" (hoses) to get it to work properly The L2 is poorly tuned In the space available my options were limited. I used @Attika's half pin solution for the fake engine, but these pins won't work with plates with a clip on top, because they can lock up on these pins. So I needed parts that were round on top. I could only think of this crankshaft part in the 2x2x2 studs space available. In this WIP you can clearly see the current situation: I added the 2L thin liftarm for the simple reason that I like the engine more going 2 up> 1 up> 2 up etc. than 2 up > nothing > 2 up. Neither option is realistic, so I chose what was most fun for me With his other pneumatic buddies: Some WIP pics That moment when you realise that your superstructure is 1 stud too long or your undercarriage 1 stud too short... I tried making the superstructure 1 stud shorter, but that would really hurt the rigidity of the arm. So I made the undercarriage one stud longer, which funny enough was a bit of a puzzle to make it bigger, but in the end it turned out better (mounting of the blade didn't stick out on top anymore for example) and the whole undercarriage is stronger than it was. No idea how much hose I used. Jono Rocky was at 1.3m of hose iirc, with 2 more pneumatic functions I am probably closer to 2 meters. There was an attempt to add a diff to this model, like the previous models I made. However due to the size of the diff and the ground clearance it would turn out something like this: As we all know from Sariel's gear calculator, there isn't a combo of gears for 1 stud down+1 stud right, but these bevel gears with half a studd offset, work pretty well for this purpose (though I doubt it would play nice with torque from a motor). It even has that, as @Didumos69 would say, "sweet Lego gear rattle". It's probably common knowledge, but it was funny to stumble upon this during the build and something I might find another purpose for in the future. I decided to drop the diff from the model in favor of the dozer blade function. I also dropped the scale of this diff concept, because the bucket would be too big. I didn't want to build a smaller bucket or use one from normal Lego, so I decided to scale up to the normal Technic bucket. In case you wonder why there isn't a video of the pneumatic functions. I tried, but my big paws block alot of the model when operating the functions And here's a video of the pneumatic functions, don't ask me why I didn't think of holding it this way yesterday... Thanks for reading yet another too long post from me
  17. I created this modified Bucket Wheel Excavator some time ago, and I thought I would like to share it on this forum. After building the original BWE, I wanted to try to incorporate some Mindstorms functions into it. I managed to motorise all the active functions, using both an EV3 brick and motors, as well as some PF motors. Functions can be preprogrammed, or can be remotely controlled using an EV3 IR remote. Here is a list of the functions: Bucket wheel rotation and main conveyor belt - PF XL motor Lower conveyor belt - PF medium motor Boom arm elevation - EV3 large motor Lower conveyor swivel - EV3 large motor Superstructure rotation - EV3 medium motor Driving - EV3 medium motor Since I owned an NXT as well, I used it to motorise the small mining truck that was included in the set. There are also some LEDs that illuminate the 'work area', but they don't really do a good job, its just a nice thing to include. Here is a video of the excavator in action, as well as the mining truck (sorry about the poor resolution and bit rate): More info about the machine can be found here: Let me know what you think of it in the comments!
  18. I was always inspired by the multi-functionality of backhoe's, and I always imagined ways to improve upon it and now I finally did. In this MOC I challenged myself to make the most multi-functional vehicle I could, using all the motors and sbricks I had, naturally I ended up buying more motors XD The final build includes 17 LEGO power functions motors (5XL motors, 6L motors and 6M motors), 4 LEGO power functions lights and 1 DIY LEGO laser! It's powered by 4 LEGO PF battery boxes, controlled by 5 SBricks and operated by a 20 channel SBrick profile. The drill/laser arm is operated by 5 channels 1 channel for rotating the arm (PF XL motor) 1 channel for tilting the arm out (PF L motor) 1 channel for extending the forearm (PF M motor) 1 channel for spinning the drill head (PF M motor) 1 channel for activating the DIY LEGO laser (TOPIC HERE) The excavator arm is operated by 4 channels 1 channel for rotating the arm (PF XL motor) 1 channel for tilting the arm out (PF L motor) 1 channel for extending the forearm (PF M motor) 1 channel for moving the bucket (PF M motor) the bulldozer scoop is operated by 2 chanels 1 channel for raising and lowering the scoop (PF M motor) 1 channel for tilting the scoop (PF M motor) The crane is operated by 3 channels 1 channel for rotating (PF M motor) 1 channel for extending the crane (PF L motor) 1 channel for operating the winch (PF L motor) The plow/ trailer hook is operated by 1 channel 1 channel for lowering and raising the plow (PF M motor) The drivetrain is operated by 3 channels 2 channel for driving forwards and backwards (2x PF XL motor) 1 channel for steering (PF XL motor) The lighting is operated by 2 channels 1 channel for headlights 1 channel for rearlights Weight: 4.6KG Length: 62cm With: 32cm Height: 31cm building time: 4 weeks A special thanks goes out to my friend Bas for helping me edit and my amazing girlfriend for her everlasting support.
  19. I triying to build the smallest pneumatic machine I can, 8 functions, 4 pneumatic autovalves and 5 motors but I don´t know yet... the fifth motor is just for the gearbox (yellow piece) without it I wouldn´t need a third receptor and in a small machine is a lot of extra room. Now you can see 4 motors, gearbox, 4 autovalves, the shifting mechanism and the outputs for the trasmision, I still have to put the stair and turntable mechanism, 4 pneumatic pumps, battery and 3 receptors with 1 motor or just 2 receptors, I am talking just about the body , I have to build tracks and two arms, normal and frontal type (this one needs the fourth autovalve to open and close it).
  20. Hi Guys! I would like to present you my latest build. Not usual small excavator truck. The target was to create small excavator truck with as many functions as possible. I wanted to build truck with 8 functions, to use all IR ports, but in this small scale, I only manage to put 5 and I put 3 functions to Dump truck in same scale. It was quite hard to put all functionality to such a small body, but the result is worth it. It has 5 PF controlled functions: 4x2 driving, steering with great steering radius, rotating platform, controlling beam and controlling bucket. Is very well playable and It can dig a sand/brick and it is enough powerful to take itself out of the ground. It's robust enough to survive young child play. More info about Dump truck can be found on my blog Some photos: More photos and indo are here: Excavator truck Dump truck VIDEO COMMING SOON...
  21. Hello Everybody My Name is Dani, im a 36 years old LEGO fanatic from Zürich Switzerland and im a brandnew eurobricks member. ;-) Im proud to introduce you my Liebherr R 9150 excavator in the scale 1:13. Yeah i know, the mining machines from Liebherr are white in real, but i like the yellow Liebherr color design much more. It is „only“ a scale model and has no functions, motors etc, cause the construction is just too heavy. I dont know the wheight exactly, but i think its about 40 pounds, this thing is HUGE. As you can see, i used alot parts, only for the black track-chains about 1200 pieces. I worked on this Monster since 3 years, of course with a lot breaks between. Effort in hours: i guess about 300. Please let me know what you think. If you have any questions, just ask. ;-)
  22. I got the Bucket Wheel Excavator in September last year, and after building it and modifying it (with Mindstorms), I dismantled it to use the pieces in my other Mindstorms creations. I'm particularly interested in the large yellow planetary gears/rings that come with the set, I hope to use them to create some sort of tank with a rotating turret. However, I'm not too sure about the geometry of the pin-holes in the rings, I don't really know where it is safe to attach a pin in a certain hole. If anyone knows of the correct geometry of the rings, it would be very helpful!
  23. Hi, all, I was planning to make a pneumatic front shovel excavator after buying 42053. Combining with the pneumatic parts of 42043, I'll have enough big cylinders for the excavator. It will be a pretty big one and fully RC is a good choice. Since this contest forbidding using PF other than driving the pumps, I chose to build a smaller one using the V1 pneumatic parts. Planned functions: 1 x L motor for pump(s) 2 x V1 big cylinders for the boom 1 x V2 thin cylinder for the stick 2 x V1 big cylinders for the bucket tilting The number of pumps and how to open the bucket are not decided yet. I aim to build this: Liebherr R9800, but it may end to a smaller type since that will look more proper at a small scale. The current progress: Advices are always welcome. Thanks for watching
  24. Hello all! I was reading the forum for quite a long now, but it didn't feel quite right to post, without proper introduction. Well, finally, let me present my first MOC here on Eurobricks: Remotely Controlled Mecalac MTX Here is the quick video showing the operation: More Pictures: Description Statistics: Weight: ~1500 g Part Count: ~1400 Dimensions: L x W x H (without boom): 300 x 140 x 220 mm Remotely Controlled Functions: Driving & Articulated Steering Continuous 360 Slewing Elevation of 1st boom section ( mLA) Elevation of 2nd boom section (LA) Sweep of the 3rd section (mLA) Elevation of the 4th section (mLA) Articulation of a Bucket (mLA) Power Functions components: 3 x L Motors 1 x Servo Motor 1 x M Motor 3 x IR Receiver 1 x AA Battery Box 1 x 9V Battery Box The color-coded render showing the drivetrain: The functions are distributed by two gearboxes - one located in the chassis with two clutches, and one in the superstructure with three clutches. The chassis gearbox is switched using the M-motor through a worm gear. The same motor controls the deployment of outriggers (Similar idea is used by Pipasseyoyo in his dump truck When the outriggers are raised, the two L motors in the chassis provide driving and steering. After the outriggers are deployed, motors drive two clutches in the superstructure gearbox. The third clutch is driven by the L - Motor located in the driver's cabin. The superstructure gearbox is controlled by a Servo. To make it work I have to get rid of most beloved Servo feature - return-to-center. Otherwise, the gearbox will be switched to neutral, each time the controls are released. The solution turned out to be pretty easy: One may say, that using the M-Motor for the gearbox would be easier and more compact. But I like the limited degree of rotation provided by the Servo, so I don't need to stop the motor precisely at the right moment. And, to be honest, after I came up with the Servo solution, I liked so much, that I'd decided to implement it besides some shortcomings. As a result, 8 functions are driven by 3 motors. But the controll requires some practice, since you need to switch the gearboxes often. And as you can see fro the video it is extremely slow. So you can't actually 'play' with it. But it works. About the development process (you can skip it, if it is enough reading for you; I haven't found a way to make a cut) After I had completed my first working MOC - a Unimog truck, I was looking to build something more technically complex, so I can put to a good use all the gears and u-joints I have accumulated in my parts collection. Well I have achieved that. In the course of the project I have ordered the additional u-joints together with a lot of gears four times, and then a little more. The inspiration came from the ingenious brick-sorting excavator by IbrahimFitzGibbon. About the same time I came across Blackbirs's Technicopedia, and was impressed with the old sets, where often several functions will be controlled by a single motor using some crazy switching mechanism. And when while on trip to Germany I saw it. Mecalac 12MTX excavator working on a narrow street in all its glory. This is it. Compact, complex, with tons of functions packed in a small space. I knew, I must build it. After I scaled the blueprints to the medium wheels I had at the moment (68.7x34R), it was obvious that the implementation at this scale will be almost impossible. Will all the motors and gearbox clutches in place where was almost no space for the structure or drive-lines. So I decided to go for it. It was extremely hard. You know, when you are completely sick of it, but something keeps you going. Every time I would start working on a new mechanism, the first version will be two or three times bigger than it should. And when after dozens of iterations it will fit, but won't work. So optimization, optimization and optimization. I have 58 LDD files for that thing, but they only reflect major changes, when I needed to start from scratch. In total it took almost three years. The main challenge was the boom. Mecalac boom have five articulation points instead of three in a traditional excavator. That means that I needed to pass four drive lines through the first rotational axis and three through the second one. Anyone who built the excavator knows how difficult it it is. I wasn't able to use u-joint for the first two axes because of the limited articulation. Additional challenge was the implementation of the third articulation point, since the axis of rotation is for that one is rotated at 90 degrees to the previous axis, and they are only few studs apart. Figuring out the way to twist the axes took a loong time. At the end I am satisfied with the result. But not more than that. It works. But you can't play with it. Because all the arm functions have a very long drive lines with a lot of gears, I had to heavily gear it down to be able to overcome all the friction. So the arm functions are extremely slow. But all the ideas work. I I really love same places in the model. Like the Servo with no-return-to-center clutch, chassis gearbox switch coupled with outriggers deployment, three u-joint passing the chassis' articulation axis at angles. There, I finally used that teeth on the old gearbox gears. Coupled with old style half bushes, it allows driving the axle directly (see the orange drive line below). And I hate Yellow color now.
  25. Here is my idea for this comp. My excavator a going to be as small as I can get it with all functions inside of it so no external hose and pump. I'm not going to base it on a particular model but just get it to resemble something like one in general. I've started with the boom and dipper arm so here is my first concept, maybe it will stay like it but its early stages. Its 2 studs wide. The biggest challenge is the 3 studs of extension from the small cylinders and getting them to achieve more than that. Boom and dipper arm raised Boom and dipper arm reached down And Bucket to body All thoughts welcome.