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I wanted to make a excavator as small as I could with PoweredUp and 8 functions, this is the result (so far). It's not based on any real life model. It uses 2 Technic hubs with Pybricks. One hub in the undercarriage and one in the superstructure. The hub in the base does the following: Drive with 2x L-motor (motors inside the tracks based on this design from crazy technic) M-motor for turning the superstructure M-motor for blade lift The hub in the superstructure has the following motors: 1 L-motor to lift the base of the arm 1 L-motor for the two-piece boom lift 1 L-motor for the stick (hidden in the first part of the arm) 1 L-motor for the bucket (M-motor would have been sufficient, but the wire is shorter of a M-motor, which would make it to the hub barely, this L-motor is in the second part of the arm) A little video with a basic demonstration of the functions: A few more pictures Interior can house a Technic fig. Easy access for a battery swap for the hub in the superstructure (on/off button is reachable from below, I might make a little mechanism at some point, but so far I like being able to just use my indexfinger to turn on the hubs). A deeper look below the bodywork: A few shots of the arm positions: Folded Maximum height All LA's at maximum extension results in a bucket being level to the ground Maximum reach Ideally it would reach the ground in this case, but 7 studs from the floor was the best compromise I think with how the boom stands when upright. In order to reach the ground I only need to turn in the "two-piece boom" LA about 0.5 studs in this case. The blade sadly is unable to lift the model. It's a wormgear on a 8T gear. Maybe it would be able to if I replace the M-motor with a L-motor. I am currently considering it, since it would fit in the undercarriage, but where the extra wire length of the L-motor was a boon for the motor in the arm, it might be too much to cram in the undercarriage. At one point I had a mini-LA in the undercarriage for the blade, but I wasn't satified with the kinematics of the blade and the general look of the attachment point of the LA. That mini-LA mounting point would have been about 2 studs above the desired (current) height of the blade. Here's an image of an earlier version of the undercarriage with the mini-LA: It was too far forward to be ideally functional, but I had very limited options to move it further back, wires (from one of the L-motors that handled drive) were in the way and/or I was sacrificing structural integrity, both not what I wanted. Rear view of the underside: In the final version the wires near the end of the the undercarriage are secured below some bars I inserted into some half pins. As you can see near the turntable I placed a bar accross the entire width of the hub so it wouldn't ever get caught on the turntable. Besides the thing with the blade, there's another issue I still want to tackle. If the arm is at "maximum reach" and I turn the superstructure 180 degrees (facing backwards), the 12T bevelgear on the turntable will skip. This is pretty much the only scenario in which it does this since I moved the whole superstructure backwards 1 stud (it would do it any position of the arm before at times). I am considering a few options to fix this like the good old, but still in production (at least until 2021) Lego weight bricks or perhaps add another kind of support (like a wheel) bel;ow the superstructure that can run over a closed off front and rear of the undercarriage (in which case I will need a mechanism to turn on the hubs). There's also another little issue with the turntable, which wobbles a little in certain spots of turning. It would even do this without a superstructure on top. Swirling the turntable a bit in hand and then putting it back would make it go away for a while, but it's not a permanent fix. Funny enough I found this problem with another turntable before I even started working on a superstructure and replaced it for this one which didn't have the problem, at first at least Maybe a slightly better balance with the rear would help with this problem as well, but adding those weight bricks for example would mean adjusting the body work and I like how it looks now A video will have to wait a bit as I want to brainstorm a bit more about these issues. I do consider these issues pretty minor though. The wobble I don't really mind. A buddy suggested teflon spray to tackle that, but since I am not really losing any cargo while it wobbles, it's not a big deal to me. The skipping 12T bevelgear for a maximum reach arm turning to the rear of the model is a pretty niche situation I think (would an operator of an excavator normally even do this except for fun?), but I never like a skipping gear so I would avoid that scenario if I can't fix it. The blade not being able to lift also annoys me a little. It's still doing what I wanted it to do: act as a bulldozer in time of need, but still. The blade isn't even needed to prevent the model from falling over, but I still think it should be able to lift the model, but I can't think of a solution in the given space and desired blade kinematics besides slapping in a L-motor and hoping it does have enough power to move it. As always, thanks for reading and looking at my pictures -
here's my submission to this competition, I decided on a compact excavator by liebherr., as it's the perfect candidate for this, it's: compact, has many functions and most importantly tracks :) here's a first attempt at a undercarriage, it has track tentioning using shock absorbers, 2 motors for drive, 2 motors for other functions, currently I have a gearbox planned for the supperstructure. I have exams coming up so I will only digitally design it at this moment, later I will do the physical design. and here's the real one -
My First aternative build for the 42148 set. A simple Excavator. I hope you're gonna enjoy the build! Feel free to share your pictures of assembled model! FEATURES Working Tracks Working Excavator arm -
I present to your attention the Liebherr 984 excavator. Liebherr 984 Model weight 6.5 kilograms Model width 30 stud Chassis control two M motors with separate BB Pneumatics control three M motors and an XL motor for turning the tower as well as with B For pneumatic pumps a separate L motor with BB -
Hello guys, Do you like oldschool Lego Technic with a single motor and many functions? I hope you would like my excavator. It has only a single PF L motor and is fully functional. It can drive and dig. Enjoy the show 😀 -
Hello, I show you my latest build. It is a mod of set 42144. I was really disappointed by the aesthetic of 42144 material handler, but I think that the arm and the turret has been well designed. And I changed everything else. New tracked undercarriage, new tilting cab (not lifting) and new grapple (too look more similar to a demolition grapple). I tried to minimise the use of extra parts at the strength necessary. Instructions are available on rebrickable: here I hope you like it! -
I again wanted to go big on this build. Like BIG. So I went 1:16 scale the best I could. I started with an existing design from a failed build. The plan is to have 2 PF-L motors for the drive, PF-XL for the boom, and PF-M for the rest. Please note that I'm almost done with the build, but I am making minor adjustments to the build to help with function and/or weight support. I will be posting here to "show my work" of sorts and get feedback. I have been busy catching up on other things and building the excavator. (not much free time for posting/commenting on here) This was the first version of the bottom: And the start of the upper: It was looking good, sort of, I had to redo all of it as I add the battery boxes and arms it had a weak structure and was "clunky" in functions. I have remade all of the above and will post more in the morning to not have too many pics in a single post. -
Alright, I'm a little late to the game, but I want to play. I confess I am still on the fence about doing a front end loader, so I'll give my draft one more go this weekend, and make a decision about if to move forward with it. But, ever since @Jundis started his Mecalac 12MTX WIP, I, like many of you I'm sure, have been spending a lot of time on the Mecalac website. They have a lot of fun little machines. Each would make a fun little project. For this contest, I wanted to see if I could do a little skid excavator. I finally got a little time to build this week, and here is what I have so far. It's pretty basic (and sorry I burned out my photo lights today), but it is a good start to see what I can fit. The MOC is currently 26 modules long, 20 modules tall, and 17 modules wide which equals 8,840 cubic modules/studs. I planned the project at 29x20x17 (9,860), so I should be fine. I suspect the MOC will get a little longer and taller, so it is good I have a little bit of space to expand if needed. Currently I have the following functions, all of which are manual: Front Plow up and down Slewing from HOG Boom 1 up and down Boom 2 up and down Boom 3 in and out Bucket scoop Interchangeable bucket I have a lot of room in the back, so I hope to do something else with that, and the cabin will have a door or something. Everything right now is a rough placement, but the movement of the boom is acceptable, so the pivot points might be effectively "fixed" at this point. We'll see where this goes.... -
My new MOC consists of a couple of items to form a big earthmoving plant package. 1. 42078 c model, Renault AE Magnum tipper and dual axle plant trailer. Truck -HOG steering -tilt cab -opening doors -working E9 V8 Mack Diesel engine -tipper with lockable tailgate -hitch at the back to couple to a wide range of different trailers. Trailer -floating pin hitch -folding legs -droppable rear ramps via small actuators -bed toolbox to store wheel chocks, chains etc. 2. 42053 c model, backhoe -4 wheel steering -quick hitch on the loader -tilting hitch on the loader -outriggers -sliding back actor with pin locks to hold actor in place. -quick hitch bucket on back actor -swinging actor with locks to hold in place for transport purposes -lift and extend functions for back actor -pneumatic functions for back actor and front loader tilt hitch -manual functions for back actor bucket angle and front loader lifting and lowering. 3. Mini excavator made from my spare parts box. -lifting and lowering as well as extension of excavator boom -front blade -swinging of main frame -tilting bucket Altogether this creates an ideal construction and earthmoving plant package. Hope you all like it. -
Backstory: Ever since I emerged from my dark age I was mesmerized by Designer Han’s models – especially dragline excavator. I like all kind of excavators so I was slowly gathering pieces for it to buy instructions and build it. I have realized over the time that building from instructions is not entertaining for me and that I can build almost anything if I have the drive (and parts). I still admire Han’s models, but I know that I would be disappointed because of his design choices. Don’t get me wrong – I still like his work, but I don’t want to build it anymore. Long story short – I wanted my own dragline excavator with truck transport. Preparations: First of all I had to pick a reference machine, in this case Sennebogen HD 670 tracked crane. Why this one? Sennebogen because it is not very known and because of this fantastic die cast model: http://www.cranesetc.co.uk/library/rosreviews/203/203review.htm . Such models are very good because you can see the machine from a lot of angles and you can replicate small details from them more easily. The model is however 690HD and I have picked smaller 70 ton 670HD. This is because of whole concept with transport truck. The scale is dictated by wheels, in this case by wheels on truck and wheels on excavator as well. Since TLG is making only two wheels for tracked vehicles it is simple choice. With bigger tracked wheels the scale is 21,5:1, meaning that 49,5mm tires for truck are perfect fit. 690HD with the same wheels would be closer to 23:1 and we do not have truck wheels for this scale. Features: Undercarriage Real crawlers have either retractable tracks or dismount them completely when transported. In order to achieve that I had to place all motors to superstructure and use single battery box. As you can see from datasheet, the tracks can be retracted so they are not wider than body. To replicate it I have built it in such way that both tracks are very easily detachable from central piece that can be swapped for narrow one. Replacing this central piece doesn’t take more than few minutes, it is only necessary to take apart two liftarms on each side as seen in the picture. Another stud or two narrower tracks would be probably better, but I would certainly lose the ability to swap it easily. All four wheels are driven by two shafts from superstructure connected to M motors; final ratio is 9,265:1. Wide track Narrow track IMGP5236 Superstructure The superstructure holds six motors (4x M-motor and 2x L-motor) – two M motors are for tracks, 1x M motor is for slewing via worm gear on turntable (56:1) and rest are for winches. Slewing gave me quite a headache because of the desired gear ratio. The real machine can rotate up to 4 revolutions per minute so I wanted to replicate that. In the end the only viable solution was to use older turntable driven by worn gear without further gear reductions. I use train PF remote to start and stop smoothly. The usage of older turntable meant I had to shorten boom because of its less stability as it bends significantly more than new type. The A frame is fixed – the boom is raised by pulling floating pulleys with attached ropes. Bigger machines uses movable A frame where the angle between A frame and boom is fixed. The A frame can be folded down when the crawler is transported. A frame is Pythagorean triplet with beams length 29-21-20. There are 3 winches for boom raising, bucket lifting and bucket drag. All three are equally geared 5:1. Counterweight is detachable as on real machine, it of course holds standard Technic battery box. Cabin features opening doors and foldable walkway. IMGP5220 IMGP5222 Ready for work side by side Boom Booms on real machines are made out of several truss elements bolted together. There is usually lower boom section that stays on crawler when transported, then are intermediate sections in various lengths (2,9m, 5,7, and 11,2m) and then headpiece section. I wanted to replicate this kind of boom so I focused on correct shape of each section and size as well. This mean that the lower boom section is pyramid-shape: 5x1 studs wide at crawler side and 9x9 studs at opposite end. I guess not all connections on it are TLG legal, but everything fits nicely without any stress and thanks to it truss-like constructions it is very sturdy. The same principle follows at intermediate section, in my case the shortest one (2920 mm => 17 studs). Boom ends with headpiece that is quite similar to lower section but ends with two pulleys. They are of course not real pulleys as TLG doesn’t make anything free-spinning in that size but size was more important to me. The drawback of such modular boom is its weight; it is almost double the weight of boom that would be built in one piece so I had to stay low with total length. There are also two pulleys serving as fairlead so the rope dragging the bucket goes to winch from top, the fairlead pulleys are mounted on lever so they stay in same position regardless of boom angle. Headpiece side comparsion boom Bucket It is brick-build and its size is only guessed from pictures and its volume, I was unable to find any datasheets with buckets. Bucket Greebling, look and difficulties As usually I pay a lot of attention to greebling like railings, mirrors, cabin shape, lights and other small details. I really had fun with this model as it is quite packed with it. The biggest obstacle during the build was constant lack of parts. Together with truck and low-loader it is reaching 4000 pieces and I was even running low on both 2l and 3l pins once. I had selected yellow color at the start, green would be certainly better for Sennebogen, but I already had some yellow parts and green technic is very expensive. Beside that I have seen pictures of Sennebogen machines in various colors like yellow, red and blue, so I think it is fine. The whole internal build is very symmetric; the only asymmetric is gearing on left side for slewing and gearing on right for drag winch. IMGP5223 Playability Honestly, playability sucks. There is one important feature of real dragline omitted – free fall winches. Without it you can place bucket too close and drag it only few centimeters. Grabbing anything with the bucket is also very difficult. Drive and slew works very well though. Truck The truck is very loosely based on this real counterpart: http://www.ditzj.de/html/en/trucks/scania/wiesbr500.html i.e. 8x4 tractor with short wheelbase, 2 steered axles, high cabin and tower behind it. It is driven by L-motor and servo is used for steering. Both steerable axles use the same configuration like in my previous truck – 5l steering arms and hubs with 3 ball joints. There is of course Ackermann steering and different angle on both axles. Rear axles are connected to fake V6 engine. Cabin features two seats, IR receiver between them and steering wheel. Whole cabin can tilt to reveal engine. Gear ratio from L motor is 7:1 because it is meant to haul quite a lot of weight. The truck can be easily modified to low cabin version as the high roof is only held by four pins. The tower is too high then so it is replaced with bare battery box. The whole truck is quite heavy on front and it have sometimes trouble with driving when it is without load so it is possible to add ballast box on its fifth wheel. There is also coupling for draw ball trailer, but it is not meant for pulling. I think the most difficult part of design was not to copy my previous truck. The cabin is still quite similar, I’m aware of that, but in the end I’m happy with other small details that makes it different – flags on front, mud flaps, detachable roof, etc. IMGP5248 IMGP5249 Working fake engine Low cabin Ballast box Low-loader Low loader with detachable gooseneck is based on Motomat’s trailer because in the end you realize there is only one viable way how to build it – two technic beams with plates between. A little challenge was how to mount wheels without using single axle for both sides. The frame between wheels can be only 4 studs wide meaning the axle can be supported by 2 studs. I have used 8L axle with stop supported by thin liftarms. In the end the wheels are supported enough, they can rotate freely and you can take them apart without axle. IMGP5260 Lowloader with detachable gooseneck Instructions I have made instructions for dragline and truck as well. Lowloader will follow soon. Both will appear on Rebrickable soon, I will add link here later. Due to amount of work it took I will sell instructions for dragline for 10€ and truck for 5€. Lowloader will be free as it is not something trully mine. Both instructions are as usually PDF generated by LPub3D. Especially the dragline is compressed into as few steps as possible, with only 115 pages (~2400 parts), so if you don't like TLG instructions for beeing too easy this might be something for you. Dragline rebrickable link: https://rebrickable.com/mocs/MOC-17193/Ivan_M/dragline-excavator/#parts Video & gallery Whole gallery is here: https://flic.kr/s/aHskDJiTT8 And one crappy video for end: -
Hello! I show here my entry to the latest Lego Ideas contest: the Volvo Excavadrone. This project born in my mind in the middle of the contest: at the beginning I was thinking about a modular construction machine, but it was not something “special”. Then I started thinking out of the box, and a flying machine was born! All functions are manual: Arm and bucket movement, with 3 Las Turret rotation Solar panel movement Flipping wheels/propellers Detachable operator cab Independent suspensions The model was a runner up winner of the contest, so I’m really proud of it. I hope you like it too.
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Now 99% happy with this, my interpretation of a backhoe excavator, based originally on the red farm tractor by TLG and evolved from there, enjoy, hope you like it like me, comments feedback welcome.
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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! -
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!!
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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 -
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 -
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! -
Hello Everybody Im happy to introduce you my Liebherr R 980 excavator scalemodel 1:25. The whole excavator is fully motorized with power functions. The goal was to combine the motorized technic world with the usual lego bricks. Was not that easy because of the weight. This beauty will be for ever with me, thats why i also builded up a box as you can see on the pictures. Let me know what you think. :-) Best Regards from Zürich Switzerland. Dani 0 by Dani Brickzone, auf Flickr 0 2 by Dani Brickzone, auf Flickr 0-1 by Dani Brickzone, auf Flickr 0-3 by Dani Brickzone, auf Flickr 0-2 by Dani Brickzone, auf Flickr 0-5 by Dani Brickzone, auf Flickr 0-6 by Dani Brickzone, auf Flickr 0-4 by Dani Brickzone, auf Flickr 0-12 by Dani Brickzone, auf Flickr 0-13 by Dani Brickzone, auf Flickr 0-14 by Dani Brickzone, auf Flickr 0-7 by Dani Brickzone, auf Flickr 0-8 by Dani Brickzone, auf Flickr 0-9 by Dani Brickzone, auf Flickr 0-10 by Dani Brickzone, auf Flickr 0-11 by Dani Brickzone, auf Flickr 0-15 by Dani Brickzone, auf Flickr 0-16 by Dani Brickzone, auf Flickr 0-17 by Dani Brickzone, auf Flickr 0-18 by Dani Brickzone, auf Flickr 0-19 by Dani Brickzone, auf Flickr -
Hello there! I would like to show you a (slow and painful) progress on my take on mini mining excavator. Yeah, the Liebherr 9800 R kind. I kinda like the model, the 42100 and Markus is my favorite Technic creator but ... Well, the model is just to big and too simple and I can see some lazy short cuts (having three motors in an arm). And I haven't even mentioned the price, which is hilarious. Sorry about the rant. So you can imagine my joy when I saw cyberdyne systems' Mini Replica. He clearly showed what can be done in small form factor. However I was wondering if fully motorized version is also possible. Here starts my story. I've decided to build roughly 1/2 scale model. Yeah, I can be lazy to and dividing by 2 seems easy enough. At the moment I am not into esthetics, it's more about function, so please forgive me some crazy decision. Let me show you what have I done so far: I've started with the undercarriage. Simple, two tracks and turntable at the top. Well, the problem is motorization and even the smallest gearing needs 2-3 studs. The results is this: I am trying to use as little space for gearing as possible. It's not elegant by far: Motors are hidden in the back: At this stage, the battery (I am planing on using 2x BuWizz) will be located in the upper portion and cables are going through the center. Is not optimal solution, but solution through the turntable with mechanical connection needs even more space in the body. Next part was the bucket. I've also choosen 1/4 cylinder, however I've found interesting idea for bucket teeth. I think it works just fine: The bucket is fully operational. Next thing was building an arm. I was just trying to mimic the 42100 in 50% scale. However transfer of power at such scale is problematic: Here is the whole arm: And this is where I got stuck. I need to fix side M motors, which at the moment are just lying around. BuWizz units will be located at right corners. I am using studded technique just to approximate size. Another problems are universal joint's. They tend to work at angles 0-45°, however the arm swings for 90°. Maybe I should attach motors at an angle. Or do some gear magic. Regarding gear magic - I have to much of them already. I guess the biggest future problem is how to fit in motors and subcarriage. Feel free to comment. -
Volvo H9X Specification of the excavator Length 60s / width 31s / height 20s (47/24,5/16 cm) - without excavator arm Max dimensions of excavator arm: 60x35 cm(length x width) Weight: 3637 g Front suspension: none Rear suspension: none AWD Steered both axles Power - 2x 8878 BB 3x M 4xL 2x XL 3x Servo Specification of the trailer Length 55s / width 25s / height 17s (44/20/13,5 cm) Weight: 1398 g Power: 1x 8881 BB 1x XL Functions Driving - 2x XL Steering - M Gearbox - M Lifting the blade - M Excavator rotation - L Movement of the arm - 3L + 3 Servos Lifting the trailer's tipping bed - XL Today, I want to present wheeled excavator Volvo H9X with trailer. Model was built for Lego contest „Build the construction machines of the future”. Later it received many improvements… In short: it is wheeled excavator without operator’s cabin. I didn’t pattern the model on any real machine. As a scale I took Claas’s wheels. For driving there are two XL motors, which drive the 4 wheels, through two-speed gearbox. First gear ratio is 5:1, and second 1,8:1. The gears are changed by M motor and two 1x7 racks. Both axles are steered by M motor with gear ratio 3:1. In the front there are blade, driven by another M motor. In the upper part of the excavator there are three comperssors for three pnematic functions. First, which drives the four big pnematic cylinders, consists of L motor and two pnematic pumps. Next two compressors are the same (L motor + one pump) and they drive the pneumatic cylinders for moving second section of the arm and the bucket. The valves are steered by three Servos. For excavator rotation I used L motor with gear ratio 155:1. In the front there are double Led lights, powered by a switch. The trailer is a simple liftarm construction. The bed is tipped by one linear actuator driven by XL motor. It is powered by switch, because of lack of free channels on the IR receivers. Gallery
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Long time no see! Some of You maybe remember my love for excavators and alternate models - 5 years ago I participated in the TC5 challange for alternate builds with an excavator and thanks to Your support I won the competition. Recently decided to challange myself again with the same task of creating an alternate model of the excavator using a middle sized set. 42094 was a no brainer as the best choice - tracks, turntable, some gears, mini actuator - most of the major components necessary for a successful build. The biggest problem was the lack of the wormgear - it would increase control and strength of the extended arm. Nevertheless, I found a solution, and in the end I'm pleasntly surprised how the MOC turned out. Functions: Working tracks (duhh) no suspension, no boogeys, more stable that way Upper structure rotates, sadly didn't manage to attach a knob, so it's done by grabbing the upper part Working boom similar to my previous build Possible to change the height of the whole boom Bucket and the second section of the arm works together - If You reach further, bucket opens, and vice versa - if the arm is getting closer the bucket closes Arm and boom function is operated by a black knob made from small sprocket pieces, to gain easier access, the rear can be opened. Both of the functions can be switched using a LBG connector that switches the clutch piece. So guys, what do You think? Also, what other alternates You would like to see made from this set? And If You want to get the LDD file than check Rebrickable or link below: MODEL INSTRUCTIONS Cheers! -
Hi. Guys! :) The high pace in building agricultural models I imposed myself last year meant that I had to take a break. I need something completely different and new challenges. Then I decided that it would be interesting to build an alternative model for the official set. The limited amount of bricks always boosts creativity. The 42100 set doesn't have a B model at the moment. When I saw model of Bobcat loader build by my friend Makkes', I thought it might be a pretty interesting idea for an alternative model. However, I didn't want to build a typical skid steer loader. Looking through this type of machine, I found the Bobcat T870. It is interesting because it has additional links and support arms. For what? Well, to get the vertical lift path. The whole system eliminates the bucket moving back effect and this makes loading onto trucks much easier. I built a loader in just over two weeks. Scaled to the wheels gave a 1:9 result. From the first pin, I planned that the model would be built modularly. It caused me a bit of problems but I learned a lot and the whole construction contains 14 modules. I started by building caterpillars and I am very proud of them. Technic links are very well stretched much better than in model A. The model is not complicated but its construction gives a lot of fun for example connecting the caterpillars with the frame and then the drive. When I ran out of one cardan, I decided to assemble it from the available elements. I wouldn't be myself if I didn't take care of visual issues. I knew at the planning stage that I wanted to finish the cabin with pneumatic hoses as a cage. I added many details such as oil tank, distributor, radiator, muffler. When we talk about visual details, operator's seat is my favorite part. I am aware that the model does not use the full potential of the set. Only a Control HUB and three engines and some parts are left for use. I treat this model as a warm-up before the next one Marek, as usual, create building instructions for the model and of course he did a perfect job. The original application is not suitable for control this model, so I decided I would create another instruction for the BuWizz application so that everyone could easily configure it. Model dimensions: Length 42cm, Width 23cm, Height 26cm, Weight 2480 gram Drive 2x XL, arms lifting XL, tilting bucket L motor. The building instructions are available at: https://sellfy.com/p/dwatsg/ https://rebrickable.com/mocs/MOC-37222/M_longer/42100-skid-steer-loader/ Photos and video below. This is my first alternative model so I am interested in your opinions. -
Liebherr HS 8040
Porsche96 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Liebherr HS 8040 Specification Length 40s / width 23-29s / height 21s (32/18-23/17 cm) – without boom Scale: 1:18 Maximum height depending on the lenght of the boom I 70 cm – equivalent 11m II 87 cm – equivalent 14m III 102 cm – equivalent 17m IV 121 cm – equivalent 20m Weight: 2945-4014g Power supply 2xBB 8878 Controlled by two sbricks 2x M 3x L 2x XL Functions Driving - 2 Ls Track sliding - M Rotation of the uppercarriage - M Lifting boom by a winch – L Two winches for moving the bucket – 2 XLs Today, I’d like to present you a dragline excavator Liebherr HS 8040. I came up with the idea of building such a machine after watching a movie from Brick Creek exhibition. The whole construction was made in about two months. For driving I used two L motors, which power both tracks with ratio 1,67:1. Because of that ratio the excavator is pretty fast (maybe too fast for such a machine). Because of variable track spacing there is no space to add other gear reduction, while maintaining the stability of the structure. The tracks are slided by four small linear actuators, driven by M motor. The mechanism of retracting tracks is based on guides of three studs height and one width. They come into the undercarrige, based on two cnostructions made of 5x7 frames, and connected by the system of sliding tracks. Details in photos below. The uppercarriage is mainly based on frames, connected by liftarms and housing made of technic panels. For rotation I used M motor with ratio 120:1. Three winches are made in similar way: the string is wound on a sleeve on an axle, between two 36 gears, driven by 12 gears. For lifting boom there is one L motor, and for moving the bucket there are two XL motors. I used modular counterweight, like in the real excavator. In the lightest configuartion it weighs 319 grams and consists of a battery box and back cover of the excavator. The heaviest configuartion of the counterweight it weighs 1140 grams. It consists of the lighter configuration and additional battery box, cover and lead weights (8x70g), which are protected against movement while driving the excavator. Boom is a simply, durable construction made with liftarms. Most angular connections are „legal”, but because of the narrowing of the first and the last section of boom, not all of them are. But they fits with no problem. Boom configuartions: I) I + IV: 30s + 44s, max height of the excavator 70 cm II) I + II + IV: 30s + 21s + 44s, max height of the excavator 87 cm III) I + II + IV: 30s + 42s + 44s, max height of the excavator 102 cm IV) I + II + III + IV: 30s + 21s + 42s + 44s, max height of the excavator 121 cm I built two buckets: a dragline bucket and a clamshell bucket. The excavator can be also used as a crane, but while lifting heavier element it would require bigger counterweight. Before I started the building, I wanted to make something fully modular. I think it worked out :) Operating the excavator is not easy, it requires a little of experience, which I am achieving. This type of machine is designed primarily to dig below the ground on which it stands (f.e. dredging water reservoirs), that’s why it’s hard to dig from a flat surface. I encourge you to like my new fanpage. Gallery -
While excavators are long-time favorite of Technic, I recently saw something new in a construction site nearby: an excavator which had a boom that telescoped and rotated around its axis, instead of articulated jib. I then learned that a company called Gradall makes those, here's an example: So I set out to build one, though I make no attempt to replicate the looks exactly as some parts of this machine are next to impossible to replicate in Lego, at least in reasonable size. The first problem was the triangular cross-section of the boom, but very soon it became clear that it's not feasible so I settled for squared cross-section. Considering the functions of axial rotation, luffing and telescoping it also became clear that the motor driving the telescoping action would have to be located on the boom, and hoses for the pneumatically operated bucket would have to run the length of the boom and exit at the back so that there would be room for extension. I wanted to extend it as much as possible, and some 11-12 studs seems to be reasonable maximum. Here's a photo of one stage: Next in line was an attempt to build a superstructure which would support the batteries, pneumatic controls and gearbox for the axial rotation and luffing. At this stage I didn't even think of full motorization or remote control, I don't have PF parts for that and it was already complex enough. I got it as far as testing the motorized boom functions which more or less of worked, but I wasn't satisfied with the performance and there was a lot of problems with the gearing anyway. Here's a photo: At this point I was at sort of a crossroads: take apart and rebuild the superstructure to fix the aforementioned problems with gearing and try to finishing the thing OR make it even more ambitious with the Mindstorms Robot Inventor set that I just recently bought. It would have 4 additional motors (to complement the two PU medium motors I already owned) and hub with 6 outputs which could be controlled much better than what PF allows, enabling perhaps full RC control with proper programming. I chose the latter so that's what I've been doing recently. And it hasn't been easy. First I needed to decide how to use my motors and how to connect them to the functions. With motorized drive (2x tracks) and slewing in addition to the boom controls (axial rotation, telescoping, luffing, bucket switch and pump) there are more functions than the hub has outputs so some sort of gearbox would be required. The 8043 Motorized Excavator acted as an inspiration with its 6 functions for 4 motors, and I decided to try similar gearbox solution where 4 two-position selectors are moved with one motor at the same time so that in one position you can drive and slew and in another position all boom functions can be operated. I also stole the coaxial drive mechanism for tracks from the same set. Here's where I'm now in photo: And in digital model: I recently realized that it's almost impossible to use the angular motors in driving the boom extension, so I ordered a C+ L motor for that purpose and I'm waiting for that now. I also ordered a new type of pneumatic switch, so that it's easier to operate with motor. Some problems at this stage: Is there any way to make the boom support narrower? The problem is the gearing for axial rotation, which seems to be pretty much impossible to fit in between the turntables in any narrower configuration than this: Another problem is the gearbox construction, how to route all the functions to their places while still having the gearbox to be properly supported and smooth so everything works fine. Especially the axial rotation seems to be hard to achieve as there is a lot of resistance in the thing. With the earlier PF iteration I tried routing the gearing to both sides so that both turntables would rotate and while it sort-of works it of course introduces a lot of gears and friction. Turning just one turntable would have the force directed through the boom to the other turntable and that requires a lot of force too so it's probably not feasible. And of course I haven't even touched the programming side of things with the RI hub yet, but I suspect that'll be much easier. Any thoughts or tips?
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It will be a front shovel or a excavator or both. My challenge is not to have reference, I want to do it strong and playable with the less pieces I can. I started with the tracks and it was not easy at all... all the weight rest over the six small wheels to have less friction on the track gears and you can take off easy the turntable, each undercarriage and the center part. I would like to know if the small tracks will be a good idea to move the machine, I think I will have to do a test with a lot of weight to test it. I did not like at all the 42100 tracks because they are too big I wanted mine just 9 studs high. I still have a lot of work to do so I am quite happy.
