42082 Model C Wheel Loader
A alternate model of the Lego #42082, features central articulation with steering wheel, 4×4 drivetrain with fake engine, rear pendular suspension, motorized raising and tilting fork, adjustable fork width and many opening elements.
Some time ago, I had the opportunity to get the #42082 rough terrain crane before the official release date, then I build the model A for making a quick review and wanted to build also the model B. But I was not happy to see that the model B had the same chassis than the model A but with different turret. That is why I have decided to create a new proper model C which was different than the first building of lego. Therefore I took apart my model A and start designing a model C.
Note : I truly understand the lego designer choice about not making the model B many different than the model A. I do not think this is because there are lazy or having not enough time to create a new model B. but because the model A is a big model, with almost 4000 parts, and need many time to build (around 10-15h). As the model is focused for children and teenagers, it was not very good to have to dismantle all the model A to create an other, also because the majority of people who buy big lego set, build the A model and display it for collection. That is why I think, lego designer made this model B as a option of the model A with using the main chassis. My model C is a completely different approach, building for giving to the lego fan one more model to build with a restricted inventory which is easy to get.
The ideas behind the functionality was easy : I wanted to have the cool functions non motorized, and the boring one motorized. It means that the drives and steering are manual, and that the raising and tilting are powered. For me it is the best approach to have the maximum of playability and are the leitmotiv of my creations.
The first function is the steering, which is operated by the beacon on the top on the roof and drives the external gearing of the turntable which is fixed on the main articulation. Then the movement of rotation is transferred to the steering wheel by using gear. Like that, the steering is very smooth and realistic with the steering wheel.
The second function (which is a passive function) is the drives with the detailed fake engine. The wheel loader have a 4×4 transmission with a fake V6 engine placed at the rear. It uses classically differentials on each axle but no differential on the center because the pivot point is placed at equal distance of each axle.
The next function is the oscillating rear axle. It has a pendular suspension with articulation made by a friction-less pin on one side, and the drive-train axle on other side. In order to prevent easy oscillating, I placed a rubber band on each side which tends to reduce the oscillating. There are also two end-stop in order that the tyre do not touch the mudguard at full oscillating.
Next functions are the most important, the operating fork with raising, tilting and adjustable width. Only the two first ones are motorized. Indeed, the L motor is placed in the bottom of the loader, on the top of the fake engine. It drives a dual gearbox with a switch on each, like that the functions can be operated independently (and in the same time). The gearbox is on the same principle has the model A, with a central reverser which makes rotate the 16tooth gear with clutch in different way, ensuring the control in both direction of the functions.
After the gearbox, the movement of the axle are centered to the chassis, and goes to 2 universal joins underneath the turntable. Then they arrives in the front chassis and powered the large linear actuators below which raise the fork, and the small linear actuator on the top which tilts the fork. The tilting of the fork is also equipped with a special geometry which enable to fork to stay in same orientation when it is raised, similar at the real wheel loader. Regarding the adjustable width of the fork, this is a function which for me as to be motorized for better playability, but it was too complex, that is why this is manual operated. Each fork can slide and they are connected to a rack, then a center pinion make the fork move on opposite direction.
The design is a important part, first of all to make the model recognizable and be nice to see for the audience, but also to make the model playable. For me, the design has a visual function, but also have to enhance the functionality or the playability of the model. For example : the mudguard can be opened with a dual link motion and reveal the fake engine and the rear railing cover can be opened. These are panel for only make the design of the rear body, so it has to be nice and well done, but it is also used as a demonstration function.
I have also work a lot on the rear paneling of the battery box to make part of the design and functionality to include in this design the two functions : battery box removable, and the easy on/off. The rear bumper weight is composed of many panel with light, and can be rotated to reveal the battery box, it is attached with a 3/4 pin which gives enough friction to lock in position but release it when you pull it out. The on/off functions is made by moving the rear attachment fixed on the bumper weight, it has a small linkage system which pushes and pulls the on/off button of the battery box, and do not lock in position when the bumper is open. you can see this linkage in the video.
To finish, regarding the design, I have tried as usual to make the more interesting design with details, nice finishing and homogeneity of the colors and shape. That is why there are mudguard front and rear, access lader, front rear and side lights, angular shape of the glass of the cabin (inspired by the iconic 8459), detailed dashboard, exhaust, seat and mirror.
Of course the model do not use all the part of the model A but is quite big, with many detailed and playable. Note that I have created a last section in the video which show some tips and trick I used for this model, like the exhaust, front roof, suspensions, or one/off linkage and I have tried a new photo setup (shooting with a new lens, in manual and in RAW) and enhancement software which gives a better result. I hope you like it.
Video and picture
The main idea of this project was to propose to enhance the building experience for the Lego rough crane 42082 by creating a unique model C, in order that people can build it by only purchasing a 42082. Therefore there are two building instructions. One for sale at 10€ with pro looking (like the official lego one) made by Kevin Williams, and one for free based on detail photo sequence. Therefore, you can buy it to support me, or just watch it for free, as you want. Here is the complete bill of material in picture file :
But you can also checked it on rebrickable (if you do not have the 42082) :
By using the next up paypal button, you will get the pro-building instruction in PDF for 10€.