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Showing results for tags 'excavator'.
Found 86 results
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[HELP] Quick latch for excavators.
Mechbuilds posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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. -
[MOC]2 motor wheel excavator(old)
msk6003 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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. -
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
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[MOC] Rope shovel excavator
Ivan_M posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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 -
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
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Bucket Wheel ExcEV3tor - a Mindstormified BWE (EV3)
The_Icestorm posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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: https://www.us.lego.com/en-us/mindstorms/community/robot?projectid=3e125a5b-475c-4a4c-b3ed-e4b4f2192907 Let me know what you think of it in the comments! -
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Ultimate Bulldozer 17 PF motors, 5 SBricks
shadow_elenter posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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. -
Pneumatic machine
jorgeopesi posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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). -
[MOC] Small excavator truck
TomasHubik posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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 lego.tomashubik.com Some photos: More photos and indo are here: Excavator truck Dump truck VIDEO COMMING SOON... -
BWE planetary gears geometry
The_Icestorm posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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! -
[TC10] Front Shovel Mining Excavator
falconluan posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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 -
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 http://www.brickshelf.com/cgi-bin/gallery.cgi?i=6254101). 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.
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[TC10] Lil Excavator
jono rocky posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
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. -
Link Belt 250 X 3 Excavator with instructions
Jurgen Krooshoop posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Following up on the Zorex-220 PF-excavator, I found that there were some things that could be improved. Inspired by the colour-scheme of the USA-based Link-Belt Excavators, I started designing a new excavator. Allthough the principles and scale are basically the same as the Zorex, there are many differences: * Link Belt is based on a real existing machine, Zorex is just a typical excavator* Link Belt has fully studless chassis, completely hiding the drivetrain inside the chassis, while maintaining the suspension* Improved driving and slewing thanks to a roller.* Uses L-motor for slewing* Openable cabin-door, cabin-roof, superstructure-side-doors and opening top.* More detailed interior* Greebles mimicing the insides of the machine* Improved scaling by extending boom and tracks Link Belt & SBrick Some weeks before Lego World 2014, I was contacted by the Sbrick-team, asking if I would like to demonstrate the Sbrick at Lego World. They sent me the Sbricks and this excavator was chosen to be the test-model for there prototype-Sbricks. The tests at Lego World turned out succesfull, the model and the Bluetooth-controlled Sbricks performed well. Using an iPod Touch as controller, there was no interference with the many PF-controlled models there. Ans the Sbrick-system allows you to controll the speed of the motors, making the controll very precise and more realistic. So when I started making instructions, 2 versions had to be made: 1 for the PF-version and 1 for the SBrick-version. Find out all about Sbrick at www.sbrick.com and social.sbrick.com Instructions Full building-instructions are available for at http://jurgenstechni...nstructies.html Parts lists http://jurgenstechni...Parts Lists.zip -
[TC10] Volvo EW180E
Technivor posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi guys! Herre is my entry for the pneumatic contest. It's a volvo wheeled excavator. I was not really happy witthe new volvo excavator o I have decided to make my own Fonctions are: (Frame) HOG at the rear of the chassis; Rear stabilizers; Front blade (Turret) PF pneumatic pump operated by m motor First boom section (large pneumatic cylinder) Second boom section (large pneumatic cylinder) Bucket (Medium pneumatic cylinder) Here are the pictures: I hope you like this if you have any questions don't hesitate to post! Have a good day! -
42053 - Volvo EW160E - MODs, Improvements, Attachments, etc.
BrickWild posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here are a few examples of what you can do with the Volvo EW160E (when it's in stores within the next few weeks!) A trailer: Forklift: Broader/Twin Tyres (preferably those from 8235 Front End Loader for example!) Grappling Claw Small Bucket Scoop Anything else you could imagine? Regards, Ryan J Smith. -
Liebherr R974 Pneumatic Excavator
Sariel posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Here's my model of a classic Liebherr exavator. I'm not overly happy with it, but my primary goal - full remote control of all pneumatics with a high degree of accuracy - was achieved. Oh, and that custom LED beacon is available here: http://bit.ly/buybeacon Photos & reading: http://sariel.pl/201...atic-excavator/ -
Brick Sorting Excavator
legomuppet9 posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Please note: this is not my creation I was aimlessly looking at Lego Technic stuff on youtube and came across this: I haven't found it on here, but I thought you guys would be interested to see the mechanisms, as they look very complex for such a small model , plus the fact it looks so cool It is also vote-able on cuusoo: http://lego.cuusoo.com/ideas/view/22356 Thoughts? -
Mini Mining Excavator
jorgeopesi posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Just an excavator fully operated from its 3 exhaust. It has 4 functions with hood to see the gears , rotation, first arm with 2 small L.A. and second arm with another small L.A. for the arm-bucket combined function. Maybe it would be nice to make instructions and a video. Forgive the photos I have neither my camera or my computer thank you. -
[TC6] Mininig excavator
jorgeopesi posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
I had unfinished the MOC and this is the perfect excuse to finish and make it better. Let me know Jim if there is something wrong, there is an old topic about it but I never finished it. -
[TC5] Wheeled Excavator
TGBDZ posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello guys! I decided to participate in the [TC5] Challenge, and for this challenge I'm using 8071 Bucket truck And my C model is a Wheeled excavator. I wonder why does the TLG always make tracked excavators instead of wheeled ones. Functions: Working Steering via the gear on the back Front grader can be raised up or down Feet on the back side can be lowered, and raised Rotation of the upper structure via the gear on the side Boom can be raised and lowered Bucket is fully operational too Here you can see that functions are controlled by yellow gears on the right side of the excavator. The brown gear at the back controls steering. Front grader and rear feet are controlled manually. Close up shot of the rear feet and a closer look of the bucket And the spare part photo - 55 parts left Video of functions can be found here (Older version of my model is seen in the video + sorry for the low quality) https://drive.google...w?usp=sharing�� Leave comments and tell me what you think. Good day everyone! -
[TC5] VOLVO SfinX CONCEPT
TheItalianBrick posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello everybody, please read carefully: as I only had 3 hours to play with my legos I came out with this "non serious try" , it's not intended to win, not to compete at all, I simply had fun doing it and from the bad picture and the "too many" left over parts you can guess I didn't try hard!! But there it is :grin: Sets used: + Hopefully something like this so there we go now! Sorry for the bad quality, taken with my Ipad. I'm off for my holiday now so won't be able to make better ones, neither to work or modify the moc itself! adjustable legs and foldable tracks as the real one!!! It can adapt to rough terrain aswell! OMG it can climb a 42000 tyre!!!! No gears involved as otherwise it would be too good.....so let's keep it as "low profile" :laugh: It can also bend forward! I know it looks like it's get on its knees.....but NO! Here the left over parts! Too many as you can see....I really should have tried harder :cry_sad: Thanks anyway, next time I'll make sure I'll come out with something nicer and more "professional" -
Caterpillar 365C Demolition Excavator
German Luigi posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello, after years of only reading occasionally at Eurobricks it is time to present my latest MOC at Eurobricks: A caterpillar 365C ultra high demolition excavator. (If the youtube video disappeared: )It started with excavator 8043. But I did not like the bucket, because playing with this bucket is difficult. In most cases LEGO bricks will not get into the bucket but will just be pushed away. So I searched for alternatives and I came across demolition excavators. A LEGO demolition excavator would be great. And this demolition excavator should be able to demolish a LEGO house, this would be incredible. But is this possible? I realized quickly: this is not just a 8043 modification, this requires a complete new design. I started with the jaw. This has to be very small. If the jaw is too long, it will be impossible to breakaway Lego bricks. And the jaw must be turnable about 180° to demolish ceilings and walls at different heights. The clamping force should not depend on the angle position of the jaw, bricks should not drop from the jaw when the jaw is moved. After some trials I found a solution using a string (well visible in the video). I built a prototype with this string solution and made a trial: will the clamping force be high enough to enable the jaw disassembling a 1x8 brick? Yes! The clamping force is just enough. So I could answer the question of principle: it is possible to demolish a LEGO house with a LEGO excavator. As the next step I designed the bucket arm. This should contain two power function M-motors and friction clutches for closing the jaw and for moving the jaw. For both functions maximum power is required without overstressing the M-motors. The bucket arm should not be wider than 5 studs. I took some time, but the design of the bucket arm was not so difficult. Then I designed the undercarriage. I adopted the design principle of Jurgen Krooshoops 8043 modification and put the gear reduction into the undercarriage. In comparison with the undercarriage of the 8043 I designed a considerable longer undercarriage. Now the most difficult part: the upper structure. Main task: lifting the boom. As a first trial I used three linear actuators parallel. The upper structure was made mainly of liftarms. During the first trial I heard a lot of clicks, but the boom did not lift a little bit. I enforced the gear box, but all subsequent trials just ended up with ugly noises. The required force for lifting the boom was just too high. So I increased the distance between the lower linear actuator bearing point and the boom bearing point. So there is less force necessary for lifting the boom. But now the adjustment range of the linear actuators is not sufficient for lifting the boom vertically. So I added two additional linear actuators to archive the required adjustment range. In total I use now 4 linear actuators for lifting the boom. I designed the gearbox inside the upper structure following these principles: - use of technic bricks instead of liftarms wherever possible - bearing of gears on both sides of the gears, it must be impossible for gears to move apart Next trial: the XL-motor is moaning a little bit, but the boom is lifting. Hip, Hip, Hooray! Now I started with detailed design of the upper structure, finally 2 XL-motors, 4 M-motors, 4 IR receiver and 2 battery boxes have to be placed inside the upper structure. Two battery boxes? Yes, I need the weight of two battery boxes as counterweight and the electric power should last for at least one day during an exhibition. As I did not have all required parts in yellow I built the excavator with available parts. So right now the excavator design was finished, but the excavator was multicoloured. As next step I built the excavator in ML Cad. During this step some improvements were implemented. After finishing this I knew exactly which parts I needed and I bought them. And then I did something I really like: building a MOC following a building instruction I created on my own. Last I created stickers and then my demolition excavator was complete. This demolition excavator was designed for demolishing a LEGO house, so I needed a house for demolishing. Of course not a single family house, I needed a tower building. Based on pictures of real tower buildings and a reasonable floor plan I built a tower house in ML Cad. And then I bought the worst available parts, the house must not look like new, it should look like ready for demolishing. Building the tower building according to the ML Cad building instruction was not difficulty, it just took quite a lot of time as 11,000 parts had to be assembled. At the end tower building and excavator were ready just in time for the LEGO FanWelt Exhibition. Kind Regards Ludger PS: Demolishing the tower building with the excavator is fun for hours. -
[WIP] Mining Excavator
jorgeopesi posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Like the 8043 but with 6 L.A.s. Tracks, rotation, gearbox are ok, I have to build a lighter bucket, carry trasmision to the second arm and think about a special linkage to achieve more travel for the first arm, a lot of work but very entertaining. Maybe I could build a normal undercarriage in the case someone want to build it. -
Excavator CAT 320C
Bocchiett posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi, my name is Tommaso Bocchietti and this is my first LEGO creaton. Please vote me at: *link removed*
