Can Lego Break Steel?

March 17, 2020 by 14 Comments

Betteridge’s Law of Headlines holds that any headline ending in a question mark can be answered with a resounding “No”. But as the video below shows, a Lego machine that twists steel asunder is not only possible, it’s an object lesson in metal fatigue. Touché, [Betteridge].

In pitting plastic against metal, the [Brick Experiment Channel] relied on earlier work with a machine that was able to twist a stock plastic axle from the Technics line of parts like a limp noodle. The steel axle in the current work, an aftermarket part that’s apparently no longer available, would not prove such an easy target.

Even after beefing up the test stand with extra Technics struts placed to be loaded in tension, and with gears doubled up and reinforced with extra pins, the single motor was unable to overcome the strength of the axle. It took a second motor and a complicated gear train to begin to deform the axle, but the steel eventually proved too much for the plastic to withstand. Round Two was a bit of a cheat: the same rig with a fresh axle, but this time the motor rotation was constantly switched. The accumulated metal fatigue started as a small crack which grew until the axle was twisted in two.

The [Brick Experiment Channel] is a fun one to check out, and we’ve featured them before. Along with destructive projects like this one, they’ve also got fun builds like this Lego playing card launcher, a Technic drone, and a Lego submarine.

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Civilian RC Car Uses Lego NXT And Ada

March 14, 2020 by 4 Comments

Back in the last century, the US Department of Defense declared that Ada was going to be used everywhere and for everything. Books were published, schools build curriculum. Working programmers, however, filled out waivers to continue working in their languages of choice. As a result, only a little bit of safety-critical software really used Ada. However, we’ve noticed a bit of a resurgence lately. Case in point: an RC car using Ada for the brains. You can watch it tool around in the video below.

This isn’t the first time we’ve heard about Ada in the past few months. Partially, this could be because of the availability of the GNU compiler, although that’s been around since 1995, so maybe there’s another explanation. Ada’s strong typing does tend to plug holes that hackers exploit, so while we would hate to say it is hack proof, it certainly is hack resistant compared to many popular languages.

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Vanquish Your Foes With Lego Playing Card Machine Gun

March 7, 2020 by 14 Comments

There was something exceptionally satisfying about those playground games of cops and robbers when we were young, but they were missing something in that a pretend gun made with your fingers lacks a certain Je ne sais quoi. Our youthful blood-lust demanded something a bit more real, and though the likes of NERF and other toys could supply it their lost projectiles came at a price not all parents could sustain. We’d have given anything for [Brick Experiment Channel]’s rapid-firing Lego playing card gun! (Video, embedded below.)

The principle is simple enough, one of the larger Lego road wheels is spun up to a respectable speed through a gear train from a pair of motors, it’s positioned over a channel through which playing cards are fed, and it picks each one up and accelerates it to a claimed 20 miles per hour. The card is fired off into the distance, ready to take down your Lego figure or plastic drinking cup enemies with maximum prejudice.

It’s clear some significant thought has gone into the firing platform design, with the cards sliding along smooth rails and the wheel sitting in a gap between the rails so that the natural springiness of the card can engage with it. The cards also emerge with a spin, due to the wheel being offset. The mechanism is completed with a third motor which acts as a feeder pushing individual cards from the deck into the main firing platform. This achieves an astonishing six cards per second, as can be seen in the video below the break.

We can see that this is a huge amount of fun, and we hope should any youngsters get their hands on it that there are not lurid tales of kids with playing card injuries. It’s not the first novelty projectile gun we’ve brought you, there have been numerous rubber band guns but our favourite is the automatic paper plane folder and launcher.

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LEGO Microtonal Guitar: Building Blocks Of Music Theory

February 20, 2020 by 8 Comments

Is there anything LEGO can’t do, aside from turning to a soft gelatin when a human steps on one? The incredible range of piece sizes that make them such versatile building blocks extends their utility far beyond the playroom floor, as [Tolgahan Çoĝulu] demonstrates with his LEGO microtonal guitar.

His LEGO what now? If you’re in the western world, microtones simply refer to those that fall between the 12 semitones-per-octave shackles of the western scale. Microtones are smaller than semitones, so they can bring a richer flavor to music, as evidenced in eastern cultures. In the past, [Tolgahan] has made microtonal guitars with fixed and adjustable frets using standard fret wire. After his young son copied his design in LEGO, he decided to bring it to life.

[Tolgahan] and a friend designed and printed a compatible base plate fingerboard and glued it in place on an old classical guitar. Then he and his son spent hours digging through their hoard to look for 1x1s and other 1x pieces to build up the fingerboard.

Here’s where it gets really interesting — they printed a ton of special 1×1 pieces to build up the moveable frets. Since they’re 1x1s, they can also be used to teach music simply by moving them around to the notes of the scale or song being taught, no matter the hemisphere it comes from. Pluck your way past the break to watch the story play out and hear this LEGO guitar for yourself.

If [Tolgahan] and his son had used machine learning to sort their LEGO, it probably wouldn’t have taken so long to find all those 1x1s.

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Lego Space Station Designed By Fan

February 2, 2020 by 9 Comments

It is no secret that most people like to play with Lego, but some people really like it to an extreme degree. Lego’s Idea platform lets people submit designs for review and also lets users vote on these designs. If accepted, the company works with the designer to put a kit in production and they share in the profits. [Christophe Ruge] submitted his design for the International Space Station and three years later, you can buy it on the Lego website.

The kit has 864 parts and the finished model is 12″ x 19″ x 7″ — probably will take longer than a coffee break to finish it. The model even includes the two rotating Solar Alpha Rotary Joints that allow the solar panels to align with the sun. You can see [Scott] building his on a recorded live stream below if you have 3 hours to kill.

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Lego Drone Finally Takes Off

January 15, 2020 by 7 Comments

We were concerned when we saw [Brick Experiment Channel] test a drone propulsion pod made with Lego. After all, the thrust generated was less than the weight of the assembly. But a few tweaks got enough lift to overcome the assembly weight, as you can see in the video below.

The next step was to build three more pods and add some lightweight avionics and a battery. The first flight was a little dicey because the sensor orientation was off. Then there was some more software tuning before things really got airborne.

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Lego Machine Uses Machine Learning To Sort Itself Out

December 16, 2019 by 8 Comments

In our opinion, the primary evidence of a properly lived childhood is an enormous box of every conceivable Lego piece, from simple bricks to girders and gears, all with a small town’s worth of minifigs swimming through it. It takes years of birthdays and Christmases to accumulate a Lego collection best measured by the pound, but like anything worth doing, it’s worth overdoing.

But what to do with such a collection? Digging through it to find Just the Right Piece™ can be frustrating, and bringing order to the chaos with manual sorting is just so impractical. How about putting some of those bricks to work with a machine-vision Lego sorter built from Lego?

[Daniel West]’s approach is hardly new – we’ve even featured brick-built Lego sorters before – but we’re impressed by its architecture. First, the mechanical system is amazing. It uses a series of conveyors to transport bricks from a hopper, winnowing the stream down as it goes. The final step is a vibratory feeder that places one piece on a conveyor at a time. Those pass under a camera attached to a Raspberry Pi, where OpenCV does background subtraction from the video stream, applies bounding boxes to the parts, and runs the images through a convolutional neural network (CNN) that’s been trained on a database of every Lego part. Servo-controlled gates then direct the parts into one of 18 bins. See it in action in the video below.

We must admit that we’re not sure what the sorting criteria are, as some bins seem nearly as chaotic as the input mix. Still, we appreciate the fine engineering, and award extra style points for all the Lego goodness.

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