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Showing results for tags 'a2212'.
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Hi everyone! Today I want to present you an off-road car, that I've been working for quite some time. There were several attempts, some of it ended up as unpolished models, without all features I initially had in my mind, and some were just concepts of gearbox, axles, etc. These were my initial assumptions on the model: Sturdy drivetrain and gearbox with a wide range of gear ratios Remotely lockable both front and rear axles Up to 1:10 scale, nothing bigger Utility vehicle - it must be able to climb step hills and also provide decent speed on plain terrain Removable body (if it would have one) Precise low speed control - to provide maneuverability over a variety of obstacles Planning the wheelbase and car elements, based on an existing vehicle - to ensure the authenticity of the model Using trusted A2212 1000kv BL motor and other RC components to power it Gearbox I always try to start with a gearbox if my model would feature one. The idea was to make it simple, yet robust. In order to achieve it, I needed to make sure each important gear will be supported by another. My other goal was to make a gearbox with a wide range of gear ratios, so at least for example 1:1 - 1st gear and 1:3 - 2nd gear. The Gearbox I use worked well in my previous concept model I didn't present here. Final gear ratios are: 1st gear: 63.787:1 2nd gear: 16.329:1 3.9 times difference between first and second gear! Now you may ask how I achieved this based just on a picture below, but we will get into that later. Axles I went through massive amount of research to have a working concept of both front and rear axle, that is driveable, able to turn (front axle) and also featuring locking mechanism somewhere. None of the concepts on the Internet were actually fitting my model. I do not have small technic pistons (I am looking at you Lego Technic Emirates), and it didn't seem I would have a chance of finding something different that will work in my case (rc car). I also knew I would use geek-servo for locking system, so only 90-degree turn must provide option for locking and unlocking mechanism. Gray 2L driving ring is actually a new one - 2473. It is not yet added to Lego studio, but the existing ring was working for me just fine. With that concept of the axle, I just needed to make sure the upper steering arm is angled, because other way it would collide with the gears. That angle is perfectly calculated, so I could work on finishing the axle, adding steering (for the front) and most importantly - locking differential mechanism. The finished front axle features: 2x 9.5L hard springs, 3x steering arms to cooperate with springs, 4x steering links, lockable differential mechanism. Did I tell you this was my own first solid axle build attempt? I guess it may be called multi-link suspension, but you have to correct me on that one. Locking differential mechanism on axles As you probably already noticed, this whole model is based around locking differentials functionality. When I was organizing my parts, I came upon instruction of my CADA C61006W, which featured locking differentials in similar scale. The idea of having one gear turning around 90 degree and pushing by it two different gear racks at the same time was splendid. That movement could rotate 6641 Changeover patch part, and thus lock and unlock 2L differential, that was the key of my goal. I went to the drawing board and after some time I created this. As you can see, If I would rotate 12T black gear to the left around 90-degree, it would push by using 6641 and 64781 parts the 2L 2473 driving ring. I just needed to make sure pivot points are correct, so the mechanism wouldn't move unnecessarily during suspension work. Chassis It needed to be as symmetrical as possible, due to previously mention features. I simply wanted it to be robust. I do not focus much on exterior or accessories - it just adds unnecessary weight to the model. The chassis also needs to have all points to attach both axles to. Body Let me just start with one sentence, I am not proud of the body. I am also not a great body sculptor. The overall design was based on Ford Bronco Badlands from 2021, but I only planned wheelbase and door placement around it. The rest was improvised, simply because I don't like rebuilding 1:1 real cars in Lego. The body is detachable and features opening doors and hood. Power system and drivetrain Ah yes, we are approaching icing on a cake. The model is, like I already mentioned, powered by A2212 1000kv BL motor. It also features 3x geek-servos: steering, changing gears and locking differentials. On top of that, I developed some sort of RC-hub (mostly because I want to organize everything in one place). This hub contains 3s battery, receiver and esc. It also features Lego Technic dimensions: 9x9x4 studs. If you want to know more about all of that, check out Brushless motors in the lego world - general topic. As you can see in the top right corner, there is an A2212 motor directly hooked to the planetary hub. This way revolutions are downgraded to let's say civilized number (from 11100 RPM to about 2000 RPM - similar to buggy motor in fast output). This also provide us built up torque, which we will for sure need in off-roading. Summary I am really proud of this model. Especially because it taught me many new things in Lego Technic world. I believe some of you can also learn from my problems and how I approached them. Here are some numbers that may interest you: Weight: 1.590 kg Length, width, height: 43x19.4x16.9cm Theoretical max speed 1st gear: 2.67km/h Theoretical max speed 2nd gear: 10.44km/h Soon I will be able to record some footage of all the features of the car and of course playtime! For now, I have more photos and GALLERY for you. -
[MOC] PiPi - small 4WD Drift car
Krxlion posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hi everyone! Not so long ago, I presented a WIP project I was working on, a 2WD Drift car. So the question is, why am I showing you this model. Actually, the best answer would be that I gave up too fast on the previous one and immediately move to the smaller scale. During building this model, I came to the realization that the problem with drifting in the previous car was not with tires (although suited drift wheels are much better), but with the floor I was testing it on. From that moment on, I was testing the model in a different place, where the floor is made out of wooden panels. Features Locked 4WD with different speeds on axles(front 1:1, rear 1:1666) Positive caster angle Working front and rear lights suited for Lego Regular Lego 49.5 mm wheels (15413+56145) Opening trunk Powered by RC setup (with gyro function - helps counter-steer) Design After the first failed attempt to build a drift car fully out of Lego bricks, I still wanted to use rubber tires and achieve my goals. In the time I was starting to build the model, there were at least two similar cars posted, which reminded me about @Anto Hoonicorn MOC. I wanted to preserve his idea of front axle in my MOC and enhance my model by giving its rear axle faster rotation speed, thus making it slip faster. The source of power still remained in A2212 BL motor, in the drivetrain you can see that it was geared down by planetary wheel hub. Model is steered by geek-servo directly connected to the axle, which controls the steering rack. Legend (explanation on stud.io bricks presented in the picture above) 4x yellow stacked 28-tooth gears are in fact a A2212 motor Grey bricks shaped in 5x3x3 are in fact a geek-servo More renders and pictures below Non-Lego parts usage RC setup (DumboRC X6FG, 35 ESC SurpassHobby, SOARIN2 S 1300mAh 7.4V 30C, A2212 1000kv brushless motor, geek-servo, Lucas Oil for lubrication) 1x metal U-joint 4x 1x3 trans-red plates from CADA Finally, I got a short video presenting the model Mass 770g Dimensions 30 x 15.2 x 12.1 cm Scale 1:12.5 GALLERY -
[WIP] 2WD Drift car with pop-up headlights
Krxlion posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hello and welcome in 2024! Today after quite a break (due to moving to a new house) I present you... Well, it does not have a name yet. Although it is kinda based on real car - Ford Probe II (which I own myself). The idea was to create a version of mentioned real car, but with rear wheels drive so it would be able to drift. After some time spent in the building process I convinced myself that I will simply go with the flow regarding body and just slightly base on Ford Probe II. Features Locked 2WD (rear wheels) Double-wishbone suspension Camber (provide less tire contact with the surface and helps drifting) V6 fake engine Regular Lego 56mm wheels (56908+41897) Manual pop-up headlights Powered by RC setup (with gyro function - helps counter-steer) Design The initial idea was to create a car in roughly 1:12 / 1:10 scale that is able to drift with rubber tires. To help achieving this I immediately knew that I need a camber in the car (this section was heavily inspired by plastic gear YT channel). For differential I went with an old 28-tooth one, because this is the only one (I believe) that can be locked. I also wanted to finally have fake V6 engine in my MOC, so by placing another 20-tooth gear in the back of the frame it not only helped transfer rotation to V6 section, but also secured differential, so it cannot skip gears. Source of power comes from A2212 BL motor, it is then transfered to Lego system using slight modification in its shaft (I explained this topic a little bit in one of my previous posts. If you want me to elaborate it deeply, please let me know :). I then gained torque but decreased speed using 46490 wheel hub as transmission. The steering is done by geek-servo, although I have a problem with those, because in fact they are not fully rotating +90/-90 degree, so I needed to put 20-tooth gear first and follow it by 12-tooth so it rotates slightly more than +/- 90 degrees. This solution provides a massive steering angle, which cost me giving up on regular wheel panel arches. So does it drift, that is the question. Answer is yes and no, what I mean by that is that without a body it does have a perfect 50/50 front/rear balance and tuning the gyro helps even further with drifting. I recently started to work on a body and sometimes I do test-drives and I can see heavy impact of that extra bricks. With the body now placed mainly in the front of the car it is a lot harder to handle and it mostly spins like most of lego "drift" cars. We will need to wait for final results after I finish the whole body and tweak everything. The video will be for sure, but not yet (need to learn properly how to drive it and build body ). Time for some renders and pictures Legend (explanation on stud.io bricks presented in the topic) 4x yellow stacked 28-tooth gears are in fact a A2212 motor Red bricks shaped in 5x3x3 are in fact a geek-servo Gloss 11x3 panels with some other bricks that are in two 5x7 technic frames are in fact a battery Front axle close-up Rear axle close-up Built MOC Partly finished body Non-Lego parts usage RC setup (DumboRC X6FG, 35 ESC SurpassHobby, GensAce LiPo 1800mah 11.1V, A2212 1000kv brushless motor, geek-servo, Lucas Oil for lubrication) 2x 3L axle cut to 2,5L (used in driveshaft in each wheel, because of non-standard length) 2x half bush cut in half, so it is 0.25 stud long (used in driveshaft in each wheel, because of non-standard length) 2x metal U-joints Mass (without body) 706g Dimensions (without body) 21.3 x 33.6 x 8.5 cm Scale around 1:11 Gallery