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Found 113 results

  1. After my last truck with a two speed transmission and air lockers, I decided to try more gears in my transmission. I searched for transmission ideas and came across the regular four speed transmission. The common wisdom is that driving rings cannot handle any torque. This is accurate. I had to increase the gear reducton in the axles and step up the motor on the transmission input to reduce the torque that the transmission "felt". I also maded the linkage from the servo to the driving ring incapable of being backdriven. It still pops occasionally, but reengaging the driving rings with the servos clears it up. It also has a neutral gear and this allows it to roll after the throttle has been released. Eliminating any extra gear exchanges to improve efficiency, reducing weight, and maintaining a rigid structure for the transmission to operate within became critical. I tried to get rid of the knob gears connected to the rc buggy motors outputs, but was unsuccessful. 12t to 12t ground the gears down 20t to 20t also ground the gears down 24t to 24t crown would not fit. Caster angle on front axle is accomplished by less angle on the lower links. I tried a wider version of the LPE power unimog axle that has kingpin inclination. It worked and did not fall apart, but its turning radius was larger than a traditional steering axle and so it was discarded. It still is assembled, just not mounted on the truck. I made air lockers based off of the new 3 stud wide differential, but ended up discarding them because they added unnecessary complication. I killed several u joints on the driveshaft before I moved up to 9:1 reduction in the axle. The u joints that are installed have wax string wrapped around the ends and a small piece of heat shrink tube over that. This is a repair because all of my joints are now cracked. If a tire becomes blocked in first gear with the steering turned, this design can quickly destroy u joints in the axle. There are a couple of altered pieces. 3l bars have had a couple of mm ground off to secure the towballs on the chassis and there is a 4.5 stud axle going to the knob gear on the transmission input. Both elements could be done without. It would require some redesign though. Moving to a 9398 style suspension and increasing the wheelbase would eliminate both of these issues. I used 4l bars to secure the towballs in the axles. They fit into the back of the towball and prevent it from popping out of the lift arm. Questions, comments, concerns, relevant war stories???? v/r Andy
  2. Winter is over (almost ), so I put away the track and get wheels. This is my fourth and best version of crawler. For drive I'm use 2 L motors (1:3 gear ratio) and one M for steering (1:3).
  3. Dear Eurobrickmembers, I made a new MOC, the Quad Crawler. It's my first own-made crawler, so I haven't got much building experience with design/building crawlers. I build this MOC because I want to prepare me for the Belgian Outdoor TruckTrail this summer. I wanted to learn some building techniques and receive driving experience. In this moc I use 2XL-motors for propulsion (gear ratio 1:1), and 1 M-motor (gear ratio 1:0.2) for steering. It also has the V2 receiver. The Batterybox lies very low (but the ground clearance is still good), so the model won't capsize fast. The suspension works very well, as you can see on this photo: I was afraid it won't perform good, because I used differentials. Still, it performs much better than I thought (indoor and outdoor) I made a nice video: http://www.youtube.com/watch?v=jmdHidAWGzs More photo's (when folder is made public): http://www.brickshel...ry.cgi?f=523374 I'll upload LDD instructions soon! I'd like your opinion and advice. Greets, Fresko
  4. Hey today I will show my new creation, tracked vehicle SV/T3 and modification, which has 4 extra wheels, for better grip. This vehicle have 4 tracks, articulated steering, two L motor for drive and one M steering (mini LA). :) First SV/T3: And SV/T3 "Extreme"
  5. LDD FILE NOW RELEASED WITH PART LIST Hopefully LEGO won't sue me for this, but now if there's a Technic fan crazy enough out there, they can have a shot at building this! LDD couldn't generate a building guide for this on my laptop but anyone is free to try to generate one. This topic is now out of date! For information regarding the all new Enforcer Recharged CUUSOO entry, visit this topic! Originally, this was an entry for the 'You Design It, We Make It' competition but it ended up in second place to the Boss. The design was based on the idea of making a body design for the 9398 chassis that looked fuller and more robust than the original. I therefor chose the legendary Hummer H2 to be my inspiration which is shown in the images below: I could not exactly replicate the Hummer design due to copyright reasons. The design I eventually came up with after weeks of hard work is shown below: The body includes a manually operated winch which could easily be motorized, opening doors and tailgate, and the battery is changed in exactly the same way as the original body design. There is also a rear roof section which can be removed to give the choice between full bodied or pickup style forms. Because the Hummer has such a bulky design, I had to be careful to build lots of the body around the wheels to reduce the height and not just stick the body right on top of the 9398 chassis. Even though this is a virtual model, it is obvious that this will greatly optimize stability, not just by lowering the height, but by having much of the weight (around the doors) far lower than in other designs. I would also like to point out that the main purpose of this model is not to be able to crawl over very steep obstacles, but rather present a great building challenge and an imposing appearence while still being able to drive over everyday mildly rough terrain. Just days before the top 10 finalists were announced, I decided that this design would look brilliant in a police theme as there are many good examples of Hummers that have been adapted into police themed vehicles: The final result of my work was this, the Highway Enforcer: This design has exactly the same functions as the original but has a totally overhauled colour scheme and new accessories such as the police lighting and rear radio antennas. The new version was so successful that it was picked for the top 10 finalists over the original entry. Below are some images showing the LDD model in more detail: The first image shows the ground clearance and height of the body as well as showing the space above the wheels left for suspension travel. The second image shows the space under the beam structure used to maintain rigidity when hinging the bodywork to change the battery. It is also possible to make out some of the gearing for the winch. The third image shows some of the interior. There are only 3 seats because I could not fit 4 in due to the hinge mechanism positioning for the battery changing. I think that actually only 2 are needed as this would reduce weight and parts. The fourth image shows the door lock and hinge. The hinge actually contains 2 smaller hinges so that the door does not get stuck on the frame while opening and closing. The lock consists of the grey rotating part on the end of the door which slots in behind the door pillar when the handle is turned. The reason that this had to be a digital design is because I don't have anywhere near the number of parts to needed to build anything like a 4 x4 crawler real life. I played with LEGO all the time when I was a child but now I am at University and this is the only chance to do something amazing with LEGO that I have had since then.
  6. In my next 8x8 crawler project I have the intention of trying a setup with the two rear axle with 2 L motor each (a motor for each wheel). the two front axles only will steer with a servo, an L motor and a differential on each axle... and all axles will be floating with 4 links and horizontal chock absorber. Did someone know if its a goon idea or if a topic already talk about this setup?
  7. Hello. I want to present you my new creation - Trial Crawler. The idea to make the crawler for trial appeared long ago, but had neither the time nor the energy, ideas. Having studied many designs, I decided at all costs to build model for trial. The main problem that I faced was the suspension. To reduce friction loss, I decided to put the motor on the axle. Patency at a decent level, but sometimes clings motors of obstacles. Features: - 4x4 with XL-motor - Steering with Servo-motor - IR-receiver v2 Suspension: That's all. Thank you for your attention. Your Sicil. Sorry for my bad english.
  8. Hello. I decided to build the crawler for trial. So far only the chassis is ready, but the model will be updated. At the moment there are only a few photos. The drive two XL-motors, one for the axle. Servo motor for steering. I would like to hear the opinion of experienced builder of trial trucks. That's all. Thank you for your attention.
  9. Hey everyone, back with a smart solution to the negative caster on axles with unimog ball joints, and a compact start to a chassis with two xl motors. I scrapped my old trial truck start but it was too complicated, and I need to stick to simplicity, with less gears and weight pics: ^while testing strength, I underestimated torque and it pulled my finger in...still hurts I guess it will help steering and just look better, and maybe suspension will twist/compress better... hope you like it!
  10. I got through the first two thirds of building, and I tested the drivetrain. The wheels are turning in opposite directions from each other, so the vehicle can't drive. I've tried flipping ad switching the motors and cables, but I can't find the problem. Any ideas?
  11. I filmed myself taking apart the 9398 Rock Crawler, then turned it into a time lapse. I'm rather pleased with how this one turned out, but I want to try again with the Unimog and a more consistent camera placement.
  12. because of the critical high center of gravity which my panel van has, i have made a more flat crawler. some people say it looks a little bit like a cobra other people think it is the child of a coke bottle but you should make your own opinion more pictures on flickr please vote if you like it.