trekman

Eurobricks Citizen
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About trekman

  • Birthday 11/10/1972

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    Technic lego, photography, computing, video editing

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  1. trekman

    First MOC - 42110 B-Model: Forklift

    This was the sort of radical engineering which we used to see in some of the older Technic sets. Take a look at the build of the fork lift on 8082 for example. it is solving a problem in a mechanical format which would be designed differently, using hydraulic or electronic means. Given the fact that the forklift made is only 2wd the opposing rotation to each wheel at full lock is even more important. A great proof of concept, but don't depend on your mast when removing product from high level pallet racking! Well done.
  2. trekman

    [WIP] Straddle Carrier

    This is a highly impressive build, and the result to me is quite good, although to others it might seem disappointing. It has already been suggested about differentials in the driveline, but i wonder should you have separate motors for each side, as there is bound to be a lot of backlash in the driveline, which is not helping with your problems either. If you had seperate drive motors for each side, then you would eliminate the need for differentials. Also if you drove the outer wheels on each side, instead of the inner ones would that make any difference? You likely need more bracing at the lowest point which does not restrict function. This is one of the situations where one is recreating a vehicle where in real life there would be hydraulic motors. They are used because the wheel drive speed could be separately managed. I just fear that the best result would be nxt, ev3 or PU motors on each side which could be configured to suit the steering arc which the machine is following. But well done so far. I will follow this...
  3. The Renault Cab is a nice alternative. Did you need many extra parts? Also well done for closing in the water tank. It looks much better than in the 42112.
  4. trekman

    [WIP] Linde P250 Tow Tractor build log

    That is a very neat looking tug. Very clean lines. If this is your third attempt after a 20 year gap, then you are doing very well. There is a lot of catch up in 20 years. All that I would suggest is to build plenty of official models also, as you will pickup ideas and that you would take a long time to discover yourself. Well done.
  5. Yes there are two differentials. There is a grey 4L differential (seen at 32secs) which is actually working between the two front wheels. I could not place this across the wheels as I needed the clearance there for the boom, as is the design for the real machine. This 4L differential is driven from a main differential (3L new style) by a XL motor, mounted perpendicular (seen at 32secs). The other output of this 3L differential is sent to the top of the turntable, and through it to drive the rear wheel. The rear wheel is normally the same size in the Manitou, but I had to select a more suitable wheel, knowing that the differential would resolve the rolling circumference issues, as well as the various wheel speeds when turning. I know that it is a bit of a long way round, but it works. I do realise that I am recreating complicated drivelines, where now in modern engineering a simple hydraulic motor and two hoses will suffice, but hey, this is the challenge of the build.
  6. Thanks for your comments. The studded boom was used because I was limited to 4 studs wide. The laminated inner section was able to have reasonable stiffness at the 2 stud width and the necessary fittings for the bucket could be integrated easily with out weakening connections. I was able to build the boom and keep the depth low, as the studs create the tension which would require an additional row of studless beams if using the new curved panels. Also I did not have sufficient new curved pieces for the boom in the correct colour.
  7. Due to dismantling, I thought I should post a video of my telehandler, based on a Manitou Twisco. The main aim in this project was to have three wheel drive, which would handle the variable ratios between front and rear wheels. This works quite well until the rear wheel is perpendicular. On the real machine, this is all managed by hydraulic motors which compensates better for differences in rotation speeds. The positioning of motors and electronics to maintain the overall look was also challenging. The lift uses a M-motor and drives a Linear Actuator to good effect. A small boom gearbox shifter transfers rotation to either the boom extension or the bucket tilt. The offset boom also tucks neatly between the wheels, as in the real machine. Thanks for looking.
  8. trekman

    Power Functions newbie help

    It depends whether you want to be building or programming. I have an NXT, as well as power functions, and the powerfunctions will just allow you to get the thing moving and functioning as you intended. I still have some of the older motors which, with the correct adapter cable are still compatible with power functions. So I am still using these motors from 1992 (Air claw rig 8868) onwards. So the functionality is still available at 28 years! I somehow wonder how the Control + App will work in 28 years time...
  9. trekman

    [REVIEW] 42112 - Cement Mixer

    It certainly looks a little more complete with the suggested feed hopper. I think this model, whilst initially looking good, is a casualty for Lego's cost cutting department. There are too many items which are missing. Feed hopper, end caps for the water tank, mirrors. It is intended for a price point and I also accept that the mixer barrel may be more expensive to mould that we realise.
  10. There should have been two 4x4 round lego dish or similar to finish off the white water tank. It seems a bit raw looking. Again, cost cutting here
  11. trekman

    Giant tractor

    I'd say you are in trouble with that front axle. If you want something that will bear weight, then put in a solid axle with a centre pivot. This will allow you to use the portal hubs and minimise the offset in your steering. It will make the steering lighter and easier to turn. Once you have that sorted out, then you could spring your front axle to the main chassis. This is how most tractors are still built. Complex suspension is not everything, especially if your steering does not turn, or ends up exploding.
  12. trekman

    Warped Model Team Tire?

    Yep, I am working with those rims at the moment, and there is a newer one which is slightly wider, 0.8mm on the diameter to be precise. Some sets used the newer rims without tyres, for rocket thrusters etc
  13. The model looks good, however, I am not expecting your front hydraulics to lift much. One small cylinder is a bit weak for the size of the tractor. I know it may look in proportion, but the performance under load may be disappointing. i look forward to watching the powered up app regulate the wheel speeds.
  14. trekman

    42108 Tow Truck alternate build

    That is a sweet ride for a non-official B model. Well done
  15. That is a very interesting design for a potato harvester. From what I understand, the "potatoes" are normally collected on the top of the belt. with soil being riddled away as they progress towards the trailer. I realise that it is very difficult to have a harvester working in the authentic manner because there is a blade which is normally working under the ground level and will bring the potatoes up and unto the riddle conveyer. I also was working on a harvester, but could not successfully get the potatoes to travel unto the belt. However you have done nice on the steering rear axle of the harvester. Well done!