A photo of a white dog with curly fur riding a black skateboard with grey motors under the front deck. There are blue squares on the top of the deck that she is standing on to steer the board.

An Electric Skateboard For The Dogs

September 6, 2024 by Navarre Bartz 1 Comment

What’s a dog to do if they want to do some accessible skateboarding? [Simone Giertz]’s three-legged pup, [Scraps], got the chance to try a LEGO Technic board for her thrills.

This electric LEGO skateboard features six motors and paw pedals to let [Scraps] steer while [Giertz] remotely controls the speed of the board. While it’s not a particularly fast ride, it does let [Scraps] live out her dreams of being a YouTube dog skateboard celebrity.

A video from [Giertz] wouldn’t be complete without a life lesson, and this time it was the importance of rest to the creative process. Sometimes when a solution eludes you, it’s just time to take a break. The steering mechanism, in particular, was giving her trouble but became simple the next morning. We’re also treated to an adorable shot of [Scraps] napping when the initial shoot of her riding the board wasn’t going as planned.

Want to try your hand at making your own skateboard? How about a deck from recycled plastic, tank treads instead of wheels, or is a rocket-powered skateboard more your speed?

Continue reading “An Electric Skateboard For The Dogs” →

A milling machine with an attached pantograph following the various intricate patterns of a spirograph on the bench next to it. The spirograph is a series of acrylic gears and brass connecting bars mounted on a wooden base.

Taking A Spirograph Mill For A Spin

August 31, 2024 by Navarre Bartz 3 Comments

Spirographs can make some pretty groovy designs on paper, but what if you want to take it a step further? [Uri Tuchman] has used the pantograph on his milling machine to duplicate the effect in harder materials.

[Tuchman] starts with a quick proof-of-concept using an actual plastic Spirograph toy to make sure it isn’t a totally unworkable idea. Unsurprisingly, the plastic is too flexible to give a highly detailed result on the MDF test piece, so he laser cut an acrylic version as the next prototype. This provided much better stiffness, but he needed to adjust gear ratios and ergonomics to make the device more usable.

The final iteration uses a combination of laser cut acrylic and machined brass components to increase rigidity where needed. A hand-turned knob for the crank adds a classy touch, as does the “Spiromatic 2000” brass plate affixed to the wooden base of the mechanism.

This isn’t the first spirograph-related project we’ve seen. How about one made of LEGO Mindstorms, another using Arduino, or one that makes these patterns on your oscilloscope?

Continue reading “Taking A Spirograph Mill For A Spin” →

Hackaday Podcast Episode 285: Learning Laser Tricks, Rocket Science, And A Laptop That’s Not A Laptop

August 23, 2024 by Kristina Panos 1 Comment

This week on the Podcast, we have something a little different for you. Elliot is on vacation, so Tom was in charge of running the show and he had Kristina in the hot seat.

First up in the news: the 2024 Tiny Games Challenge is still underway and has drawn an impressive 44 entries as of this writing. You have until 9AM PDT on September 10th to show us your best tiny game, whether that means tiny hardware, tiny code, or a tiny BOM.

Then it’s on to What’s That Sound, which Tom and Kristina came up with together, so there will be no pageantry about guessing. But can you get it? Can you figure it out? Can you guess what’s making that sound? If you can, and your number comes up, you get a special Hackaday Podcast t-shirt.

Now it’s on to the hacks, beginning with an open-source liquid-fueled rocket and a really cool retro trackball laptop. Then we’ll discuss screwdriver mange, the Wow! signal, and whether you’re using you’re calipers incorrectly. Finally, we look at a laptop that that isn’t really a laptop, and one simple trick to keep things aligned on your laser engraver.

Check out the links below if you want to follow along, and as always, tell us what you think about this episode in the comments!

Download in DRM-free MP3 and savor at your leisure.

Continue reading “Hackaday Podcast Episode 285: Learning Laser Tricks, Rocket Science, And A Laptop That’s Not A Laptop” →

Stemfie, The 3D-Printable Construction Set

August 13, 2024 by Lewin Day 2 Comments

Construction kit toys are cited by many adults as sparking great creativity and engineering talent in their youth. LEGO, Meccano, K’NEX, Lincoln Logs—these are all great commercial options. But what about printing your very own construction kit at home? Meet Stemfie.

Fundamentally, Stemfie isn’t that different from any other construction kit you might have seen before. It has various beams and flat plates that are full of holes so they can be assembled together in various ways. It also uses bolts, spacers, and small plastic nuts that can be tightened using a special hand tool. Think of a mixture between LEGO Technic and Meccano and that will get you in the ballpark. It includes neat motion components too, including gears, wheels, and even a large flat spring!

What can you build with it? Well, as every construction kit toy says, you’re only limited by your imagination! However, if your imagination is especially small, you can just use the Stemfie 3D YouTube channel for inspiration. It features everything from a ping pong ball catapult to a rubber-band driven car. Plus, since it’s all 3D printed, you can simply scale up the parts and build even bigger designs. Like a giant catapult that can hurl entire water jugs. Fun!

We’ve seen other projects in this vein before. One of our favorites is [Ivan Miranda]’s giant 3D printed assembly kit that he uses to build big monster toys.

Continue reading “Stemfie, The 3D-Printable Construction Set” →

RC Submarine Build Starts With Plenty Of Research

August 13, 2024 by Orlando Hoilett 19 Comments

[Ben]’s a 15-year-old who loves engineering and loves taking on new challenges. He’s made some cool stuff over the years, but the high water mark (no pun intended) has to be this impressively documented remote controlled submarine.

His new build starts off with more research than the actual building. [Ben] spent a ton of time investigating the design of the submarine from its shape, to the propeller system, to the best way to waterproof everything, keeping his sub in tip-top shape. He decides to go with the Russian-style Akula submarine, which is probably the generic look that most of us would think of when we hear the word submarine. He had some interesting thoughts on the propeller system (like the syringe ballast we’ve seen before), and which type of motor to use. In the end, he decided with four pumps that would act essentially as thrusters. ~~fill a chamber with water, allowing the submarine to submerge, or fill with air, making the submarine buoyant, allowing it to resurface.~~

However, what we found most interesting about his build is how he explains the rationale for all his design decisions and clearly documents his thought process on his project page. We really can’t do [Ben]’s project justice in a short post, so head over to his project page to see it for yourself.

While you’re at it, check out some of these other cool submarine builds that we’ve featured here on Hackaday

A finger points at a diagram of a battery with two green bars. Above it is another battery with four smaller green bars with a similar area to the first battery's two. The bottom batter is next to a blue box with a blue wave emanating from it and the top battery has a red box with a red wave emanating from it. Below the red wave is written "2x wavelength" and below the top battery is "1/2 energy in a photon."

What Are Photons, Anyway?

August 1, 2024 by Navarre Bartz 33 Comments

Photons are particles of light, or waves, or something like that, right? [Mithuna Yoganathan] explains this conundrum in more detail than you probably got in your high school physics class.

While quantum physics has been around for over a century, it can still be a bit tricky to wrap one’s head around since some of the behaviors of energy and matter at such a small scale aren’t what we’d expect based on our day-to-day experiences. In classical optics, for instance, a brighter light has more energy, and a greater amplitude of its electromagnetic wave. But, when it comes to ejecting an electron from a material via the photoelectric effect, if your wavelength of light is above a certain threshold (bigger wavelengths are less energetic), then nothing happens no matter how bright the light is.

Scientists pondered this for some time until the early 20th Century when Max Planck and Albert Einstein theorized that electromagnetic waves could only release energy in packets of energy, or photons. These quanta can be approximated as particles, but as [Yoganathan] explains, that’s not exactly what’s happening. Despite taking a few classes in quantum mechanics, I still learned something from this video myself. I definitely appreciate her including a failed experiment as anyone who has worked in a lab knows happens all the time. Science is never as tidy as it’s portrayed on TV.

If you want to do some quantum mechanics experiments at home (hopefully with more luck than [Yoganathan]), then how about trying to measure Planck’s Constant with a multimeter or LEGO? If you’re wondering how you might better explain electromagnetism to others, maybe this museum exhibit will be inspiring.

Continue reading “What Are Photons, Anyway?” →

Hackaday Podcast Episode 281: Metal Clay, Desiccants, Silica Gel, And Keeping Filament Dry

July 26, 2024 by Kristina Panos 2 Comments

This week on the Podcast, it’s Kristina’s turn to bloviate alongside Editor-in-Chief Elliot Williams. First up in the news: our fresh new contest has drawn three entries already! That’s right, the 2024 Tiny Games Challenge is underway. You have until September 10th to show us your best tiny game, whether that means tiny hardware, tiny code, or a tiny BOM.

Then it’s on to What’s That Sound, which sounded familiar to Kristina, but she couldn’t place it. Can you get it? Can you figure it out? Can you guess what’s making that sound? If you can, and your number comes up, you get a special Hackaday Podcast t-shirt.

Then it’s on to the hacks, beginning with a hack to print metal and a way to weld wood, along with a photo-resistor-based, single-pixel camera. We’ll talk desiccants carbon fiber, and Baron Harkonnen. Finally, we discuss the troubles of keeping hygroscopic materials from degrading, and have a klatch about Keebin’ with Kristina.

Check out the links below if you want to follow along, and as always, tell us what you think about this episode in the comments!

Download and savor at your leisure.