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markus53

Eurobricks Vassals
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Everything posted by markus53

  1. markus53
    Hi Alex, your unimog instruction was very good. So feel free to make one of our crane! I would appreciate it. markus
  2. markus53
    by the way, there maybe is still interest in orange flashing beacons like we used in my last posting. It is a nice project and it is always a lot of fun to make things by your own. It is no easy project for beginners, though. If you only want to have them, then ask zmei gorini4, he did a great job. And the price is not high for such hand made things, really. markus parts available at www.reichelt.de NE 555 D SMDTimer, SO-8 SMD 4017 CHIP-IC, CD 4017 LO P476 OSRAM Point LED, 355 mcd, orange SMD-0603 470 SMD-Chipwiderstand 0603, 470 Ohm SMD-0603 21k5 SMD-Chipwiderstand 0603, 21.5 kOhm lego power functions connection cable base plate We used the single wires of high frequency litz wire (100x0.1mm) for electrical connection of the beacons to the control circuit. They are coated each and they are thin enough. The silk wrapping can be used for covering the cable. Available e.g. at Menting (www.spulen.com). Other wires are also possible of course.
  3. markus53
    i wanted to share our double cylinder crane with two fold extension arm. It was inspired by a project of Patrick Riedel and Nitroeumel1. A double cylinder technique has double the force and half of the velocity of a single version. So the motions are more powerful and less nervous. We adopted it in some places. The feet are moved like a knee lever. At the end of down movement the pneumatic cylinder makes a long travel and generates the greatest force at the foot. The joints of the arms are optimised. The second arm does extract two elements with one movement. It reaches almost double its original length. The gear can either be done by a micro motor or by manual wheel. So it is a very compact crane when folded and it has a really long extension when working. LDRAW model see link below. Markus http://www.brickshelf.com/gallery/markus434/Unimog/kran1.mpd
  4. markus53
    after some questions we made a little video of our 2speed automatic gear described earlier in this thread:
  5. markus53
    Hi Jesse, i drilled a hole of about 1.5mm into the side of the diff. The position is critical and has to be perfectly in the middle. Then i cutted a cross axle to the appropriate length and removed the cross wings at one half of the length. This end must fit into hole with only small clearance. The assembly of the gears is indeed a nice puzzle and described well above. Markus
  6. markus53
    we did also enforce a differential because it was not skip proof under heavy load. The main advantage is that the forces on the axle bearings are symmetrized and so they vanish. Also the bearing play is much better and prevents skipping. Additionally differential lock function found earlier in this forum. markus and jakob
  7. markus53
    Hello Alex, the changes are only at the rear part, mainly the L-motor with its suspension. Now you can adjust the gear ratio of the L-motor with the two wheels at the back and for the XL-motor it is adjustable at the portal axle. Markus
  8. markus53
    Hi jabo, great that you got it run! Yes, the M-motor is a little bit weak. We also implemented an L-motor these days. It needed some additional wheeles because it skipped at the place i had the M-motor like yours. But now the fast gear can be really fast. I would be interested in your solution also your steering. The low gear is in deed slow but we wanted to have off road ability without compromise. Markus http://www.brickshel...mog/unimog3.mpd
  9. markus53
    Hi Alex, i hope you can finish it. Ours (actually that of my son) works pretty well. And of course there are many minor bugs in the mpd-file i m sure. And i noticed that i can send you PMs only when... i have posted minimum... ...10 posts. if the 20 teeth wheel runs counterclockwise faster than the 8 teeth one then it free wheels because the left 8t wheel is only pressed down with slight force and lifted up by the 20t wheel. If it is slower or even clockwise then it is driven by the 8 teeth wheel from the XL-motor. Markus
  10. markus53
    Hi Alex, It seems to me, that the XL-motor and the M-motor are working against each other. You must turn the polarity of one motor. Then it will work maybe. The lock at the middle differential is a real block of the differential function. Markus
  11. markus53
    Hi KAKTyC, yes the the trailer has suspension at the rear axle as you maybe can see on the photos. The front axle must be twistable around the vertical axis for turning, and instead of suspension it is twistable around the longitudinal axis to balance out ground bumps. markus
  12. markus53
    A trailer in the design of the unimog. The building instruction is included as ldraw file. http://www.brickshelf.com/gallery/markus434/Unimog/trailer.mpd
  13. markus53
    kevman, the mpd-file is created in LDRAW. I am not yet able to convert it in an LDD. The mpd-file includes the complete model.
  14. markus53
    @kevman, i think i have almost what you are searching for. I have modified the unimog with RC-control, two gear automatic, steering, while keeping all other functions. Also the design is preserved as much as possible. There are though many modifications. - Steering is done by an M-motor located at the front axle with a gear 1:9 and a friction clutch. This location is better for a low balance point and there is no problem with the loose force transmission when the motor is placed in the driving cab. - Two gear automatic drive. The fast gear is driven by an M-motor. If the rotation speed gets too low, an XL-motor takes over the driving with low transmission ratio. A freewheeling mechanism decouples the XL-motor in case of fast velocity. It can climb up to 100% slope. It is necessary a hand made part. Cut a half long bush in two parts and polish them with sand paper down to 1.2mm thickness (see photo). It makes a well defined friction at the freewheeling unit. - Lockable middle differential gear. The cross-country mobility is much better if the middle differential gear is blocked. Alasdair Ryan suggested that solution at page 36. Unfortunately the unit with lock is one stud too long. so it need a bigger modification in the center box of the unimog. I also reinforced the differential with a fourth gear wheel. Then it stands more than twice the force. - The left back wheel suspension is half a stud higher than the right one to balance out the weight of the battery box. - LED lights front and rear http://www.brickshel...mog/Unimog2.mpd
  15. markus53
    Hi Pat-Ard, i tried to convert it into ldd quickly, but only half of the bricks were placed. Maybe anyone can do it better than me... sorry.
  16. markus53
    So many good ideas here. Another two axle trailer straight in the design of the Unimog. Added also an ldraw file, run lsynth to complete the hoses and LED-cable. Trailer.zip
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