There is definitely a passion for detail and accuracy among LEGO builders who re-create recognizable real-world elements such as specific car models and famous buildings. However, Technic builders take it to a level the regular AFOLs cannot: Not only must their model look like the original, it has to function the same way. Case in point, [Wolf Zipp]’s version of a massive bridge-building rig. The Chinese-built SLJ900 rolls along the tops of bridges and adds ginormous concrete spans with the aplomb found only in sped-up YouTube videos. It is nevertheless a badass robot and a worthy target for Technicization.
[Wolf]’s model is 2 meters long and weighs 10.5kg, consisting of 13 LEGO motors and a pneumatic rig, all run by a handheld control box. The rig inserts LEGO connectors to a simulated bridge span, lifts it up, moves it over the next pier, then drops it down into place. The span weighs 2.5kg by itself — that ain’t no styrofoam! There are a lot of cool details in the project. For instance, the mechanism that turns the wheels for lateral movement consists of a LEGO-built pneumatic compressor that trips pneumatic actuators that lift the wheels off the ground and allows them to turn 90 degrees.
Sometimes it blows the mind what can be built with Technic. Check out this rope-braiding machine and this 7-segment display we’ve posted.
9 thoughts on “Functioning Technic SLJ900 Bridge Builder”
Beats the Lincoln Logs of our day.
I’d love to have the money all that LEGO cost. :)
If you modulate the power to the motors with audio, can it make the noisy gearing sound like a Dalek?
That’s one of the things that crosses my mind when I see such massive Lego constructions. I used to love putting together little Technic things, but I would always run out of pieces before I could make the thing I wanted, then I’d start redesigning with compromises.
Welcome to the engineering world.
Well in the bridge world it’s a bad thing when you run out of pieces and start improvising.
There is an insane amount of engineering that went into that build. I’m really impressed! Great work!
Bet he cheated and used the kragl … Lord Business will be pleased.
Apart from that though, looks like a lot of fun to drife.
Man, people are shit, but humans are amazing. That both his lego and the real one are just freaking incredible feats of engineering.
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