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Found 4 results

  1. From promobricks.de: The blue and white telehandler is also ideal for beginners. It consists of 143 parts and costs 9.99 euros . A small palette is also included in the set. This set should also have a B-model again. Set number: 42133 Designation: Telehandler Number of parts: 143 Release date: March 01, 2022 RRP: 9.99 euros
  2. Motorized model of a crawler crane with Mindstorms EV3. Features driven tracks, and superstructure functions controlled by an automated distribution gearbox. Functions/features: Driven tracks Boom elevation Boom extension Winch Superstructure rotation Ever since TLG released the rotary catch pieces from the Bugatti set I sought to incorporate it in a distribution gearbox so that I could control 4 functions with 2 motors. However, I did not want the play experience to be constantly interrupted by shifting the gearbox. For instance, if I used PF and installed a stepper mechanism to control the gearbox, I'd constantly have to count how many "shifts" I've done to ensure the right function is engaged. With that in mind, I realized Mindstorms EV3 is the perfect solution to this - by simply utilizing a touch sensor, the mechanism can detect how far the shifting motor has rotated thus automatically selecting the right function. The gearbox, which sits at the heart of the superstructure, features a cam attached to the shifting motor to hit a touch sensor. When a command is received from the remote, the shifting motor rotates until the touch sensor is pressed, then the EV3 tells the shifting motor to rotate a certain number of degrees to select the corresponding function. This utilizes a switch/case for the remote, and because it features up to 11 button combinations all superstructure functions are controlled from the same channel (channel 2 on the remote). This gives controlling the model a very natural feel, and sometimes I even forgot that I was controlling a distribution gearbox because the EV3 shifts it so seamlessly. As for driving, it too uses a switch/case for the remote. Because it's just a simple tank drive, the commands for this are much more straightforward compared to the gearbox functions. Driving is controlled from channel 1 on the remote. Additionally, there are sound effects that play while operating the crane. Pressing the left two buttons together in the 1st channel starts the engine (thus starting the program), and pressing the right two together stops it (thus ending the program). Because the PF IR remote uses levers instead of buttons, this effectively makes the model inoperable with only a PF remote. The EV3 remote feels more natural for controlling this model too, as some superstructure functions (boom elevation and superstructure rotation) involves pressing two buttons simultaneously. In the end, I'm pretty satisfied with how this model turned out. I was initially worried that this gearbox I had in mind won't work as smoothly as I imagined, but it turned out to work flawlessly. It often made me forget that I was even controlling a gearbox as the EV3 does the shifting for me. Of course, there's still areas that could be improved - for instance, the boom extension and winch operate pretty slowly. Not using a worm gear in those mechanisms probably would've helped, but that would mean the mechanism becomes "unlocked" as soon as the gearbox disengages it. Occasionally the gearbox would jam, making me restart the program, but overall the finished model met my expectations. Video: Photos:
  3. Hi! I built a telescopic tracked car, that can extend in two directions to overcome obstacles ? Have a look and subscribe to my channel, if you want more videos like that (building instructions available). Thanks!
  4. I thought this would be worth sharing. For the suspension of an RC model I'm working on (yes, I will keep my promise @DugaldIC), I want to have a telescopic transmission shaft that can take quite some vertical travel while spanning a constant distance of 6L, the length of a non-telescopic arrangement with two u-joint. I know about Sheepo's design, but that one can only take little vertical travel before the slider axles collide with the u-joints. So I've been playing with this a little and found an arrangement that works very well. It can take quite some torque actually, even though I'm not planning to use it for transferring motorized drive. This will only connect the wheels to a fake engine.