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It's been a while since I presented my last large model - the Krone BigX 770 forage harvester. I decided that this time I would start building something more demanding. It will be a potato harvester Grimme 270. Where did this idea come from? On one Bricklink order, a seller made a mistake and sent me three Power Puller rims. I took that as a sign to start building this three-wheeled monster. There are several configurations of this machine with different wheels and even a track only on the right side instead of the wheel. I decided to build a classic version with wide tires. The biggest advantage of this model is that the engine and mechanisms are in the thrust on the right. It's the perfect place to make use of it and use it as the main frame for the entire model. It's the perfect place for all engines. This is very important because I would like the combine to be solid and able to operate at exhibitions. I would like the harvester to actually harvest "potatoes" that will be brick round 1x1 or small beans. This is why I gave up building the larger Varitron 470 terra track. The 270 version gives you a better chance of it running like the real thing. However, this is a huge challenge. The model will use the Power Functions system controlled by 2 or 3x Sbrick. This is my favorite setup. The combine will have 10 functions and will use 8-11 channels depending on how I manage to place the mechanisms. This will be: - driving - turning - rear axle width extension - lifting the collecting belt - control and drive of the haulm cutter (this is the front tool) - unfolding the main tank - unloading belt drive - fine haulm conveyor drive - belts at the rear - main belt drive - lighting I started the construction with the most difficult element - the rear axle. I really wanted to keep the width change function. After building a dozen or so versions, I finally decided on one without a differential and with one-wheel drive. Instead, it has two actuators that stabilize the right wheel. This is very important because about 70% of the model's weight will be loaded on this axle. The GIF below shows how the resize function works. You won't have to wait that long for the next updates. This model is one of the two major projects for 2022 :)
