KirTech LAB

This project is absolutely mind-blowing! You must have infinite patience. Just don't stop :)

Hi! I'd like to share some thoughts regarding a winter test-drive of my 42131 CAT D11 Dozer. The first indoor tests left very good impressions, and I was excited to try it outdoor. I still remember a short video from the official LEGO website, were the 8275 Dozer pushes snow (it was about 15 years ago :)) The set isn't new, I tried to find something similar here, but without any results. Sorry, if this topic has been already discussed. - Let's begin with the most important function - a motion. It works very well indoor, especially on a soft surface, but for moving in snow grousers are too small. Of course the model can push some amount of snow but it tends to stuck and skid. Some additional beams on tracks will improve the situation. - As we know, the blade elevation in a stock model works extremely slow, I tried to solve this problem by replacing gears near the actuators. Instead of 12:20 reduction I've done 20:12, but the system even couldn't complete a calibration, so I ended up with 12:12 ratio. But in outdoor conditions (it was pretty cold) it didn't work, probably because of accumulators voltage drop. So, during the test-drive I couldn't change the elevation at all. And as a result, I also didn't use a blade tilting mechanism. - Of course, the ladder mechanism works perfectly in any conditions :) - And the last function - a ripper. If we follow building instructions of the set, ripper won't even touch the ground, so it's necessary to change its connection points. The ripper works very well in loose snow. It would be cooler to have three teeth instead of one, but there is a risk, that it will be not a ripper but anchor, because of low tracks friction :) So, without any modifications the model has pretty low performance in snow (yes, I'm spoilt by BuWizz and buggy-motors). But I had a lot of fun during these tests, you can check the dozer in action: Thanks for watching!

Cool truck and crane! Looks great :)

Thank you very much :)

Excellent start - the shape is 100% recognizable! We need more pneumatics :)

Looks very promising! Can't wait to see the final result.

It sounds very interesting. I'm sure we'll see a lot of awesome models soon!

Hi! It's not a new MOC, but finally I was managed to film a video with English comments, so the topic is updated :) I hope you like it, thanks for watching!

Wow, I'm not a big fan of motorcycles in general, but this MOC is just awesome!

Thank you :) No, I didn't. The central part of the model is pretty dense, I added some additional beams and triangles to make the turntable stable in all positions of the upper structure. The worm reducer would be very useful here :)

Hello, my dear friends. Today I'd like to share the model that was built one year ago, this is definitely not my best MOC, but it had some interesting ideas. This is a concept of an autonomous dump truck. The truck doesn't need a driver, so we can remove the cabin and use an extra space to transport more material. Also, since we have no "front" with driver, a number of maneuvers can be reduced, there is no necessity to do 180-degree turns - the truck can just drive in both directions. To make this machine more flexible I added a turntable in the center to have an opportunity for unloading the bin in any directions. Before this large-scale truck I had smaller model, and it had one more feature - the counterweight that compensates the shift of the center of gravity during the unloading process. But in the big model I had some issues with the frame reinforcements, so I decided to exclude this feature. So, this is a weird-looking result: I used 8x8 AWD chassis (6x L-motors, open diffs), 8x8 steering for small turning radius (2x Servo-motor), independent suspension (too stiff, it would be better to use one stiff and one soft shock absorber on each wheel), bin rotation (M-motor, the system like in the crane 42082), two-stage unloading (I think three motors, actuators to move the main mechanism out of a dead point, and the winch to move the main rod). And one more additional feature - automatically opening rear side of the bin, like in real trucks. The model was powered by 3x BuWizz (two in the chassis and one in the superstructure not to route wires through the turntable). You can check the performance in the video: Actually I have not too many photos, because the design was pretty rude :) PS: I've just a bit updated my profile and my YouTube channel, my old nickname is desert752 :) Thanks for watching!

Thanks ) Me too, especially during transverse roll.

Thanks :)

Hi! It's not a new MOC, but finally I was managed to film a video with English comments, so here you can find a piece of true winter :) The model is 73 cm long, weights 2.4 kg (without underwater stabilizer) and contains seven motors and 2x Buwizz receivers. The main feature of the model - it can really break the ice. Functions: buggy motor for the screw, working rudder, two drills and adjustable trim of the vessel. More photos you can find in the album: https://www.flickr.com/photos/141718063@N06/albums/72177720295371540 Thanks for watching :)

Thanks :) You are right, I've excluded this function to mount more motors in the rear part of the model. Two cylinders look more realistic and the crane is more powerful )

Thanks :)

Hi! A few months ago I've motorized the set 42128. All the functions have remote control except the axle lifting. The model has 10 remotely controlled functions including pneumatic system with compressor, pressure gauge and air tanks. 12 motors in total and 3x BuWizz 2.0 to control all the functions: - 3x L-motors to drive - Servo-motor - steering - 8x M-motor: compressor, 3x pneumatic valves, outriggers, rear jack, crane rotation, double winch I have detailed video in Russian, you can find there many pictures of the inner structure. Thanks for watching :)

no differentials, it's not a problem on the ice )

Hi! Awesome contest! "Mindstorms and LEGO Electronics are not permitted" - Is it true also for sets that really have a motor? For example 8868 has a motorized compressor for smooth pneumatics operation.

WoW! It's my favourite LEGO set. Can't wait the result :)

Thank you very much :)

:)))))))))) I'm sure there were no sand. Double wheels, big weight and high-speed motors. Probably it's not an inner damage, but the friction between the case and the part with pins. It seems now the backlash is much more.

Thank you! I'm glad you like my new pet :) Thank you @Milan :) 1. I haven't used a lubrication, so unfortunately planetary hubs started to destroy :( 2. Single lights look a bit too small to my mind . It's just my vision, of course it's easy to fix it :) Regarding to my experience, the number of pieces in thousands is close to the weight in kilograms. It's very approximately, but I suppose the truck contains 8k-9k pieces.

Thank you very much for so many positive comments :) I've inserted a few photos into my detailed video on main channel. Fast output of the buggy-motor drives the new differential gear (from 42109, 42114, 42124) and than planetary hubs from 42099 are mounted. I don't know about auto-translated subtitles, but you can take a look to the video at 4:11 (axles photos) and 7:11, 7:53 (how the suspension works). I suppose about two months in total. It's hard to mark one challenging part )))) I had some issues with frame strength (it is 5 stud high and 90 cm long), how to unload huge bin, and of course how to replicate very unusual cabin shape :) The bin is lifted in two stages controlled by two separate levers in control profile. I've just cut the pause between the first and the second stages )

Hi! I’ve finished new MOC, a scale model of huge mining truck REXX produced by Australian company BIS Industries. The real truck is 14,3 m long and can carry 160 tons :) The scale is 1:15, so my model is 95 cm long. The total weight is 8,5 kg. My truck contains 15 motors and 4 BuWizz receivers. Functions: - AWD, five buggy motors, twenty tractor tires - Suspension, solid axles - Steering 10 x 6, three servo-motors - Bin unloading, one XL and one L-motor - Ladders, two M-motors - Doors, two M-motors - Wipers, M-motor Enjoy the video :) More photos on my Flickr: https://www.flickr.com/photos/141718063@N06/albums/72157719145182635 Thanks for watching :)