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July 2, 2009

DIY fireworks kit

This is a moment that would have made 15 year old me very proud of present-day me: I've just received a DIY fireworks kit in the mail! I love the "Don't Send This Via Airplane" sticker.

My friend Heathervescent hipped me to this introductory Turbo Pyro kit from Skylighter. The kit supplies what you'll need to make your own fireworks, including a 206 page eBook that guides you through making ten different fireworks: from tube sparklers to bottle rockets to aerial shells to something called a "Flying Fish Fuse Mine". I've skimmed through the eBook and it looks thorough and professionally done. It has a number of embedded videos in it, which should be pretty helpful.

I've only had moments to scan the contents of the boxes, but they include a lot of paper tubes, charcoal, potassium chlorate, clay, potassium nitrate, sulfer, and other compounds (this endeavor involves making your own gunpowder), a few different kinds of ignition fuses, a bunch of mysterious custom tools for packing the fireworks, a digital scale, mortar casings, a large mortar tube, and more. You have to supply some sieeves, trays, measuring spoons, an electric coffee mill, tape, glue, safety gear, and a few hand tools.

I'm going to try the simplest projects first, hopefully in time for the 4th of July. Then, if all goes well (and I have the same number of fingers as I'm typing with right now), I'll put together some of the big flying stuff and head out to the desert to fire them off.

You can sign up here to be notified when the next batch of kits is available:TurboPyro

Their blog is pretty cool too, I had no idea people had taken things to this level!

Posted by John Park | Jul 2, 2009 03:00 PM
DIY Projects | Permalink | Comments (10) | Suggest a Site

The Walnut Creek model railroad

Now this is a train layout, 1,800 sqaure feet of it. It's the pride and joy of the Walnut Creek Model Railroad Society, Walnut Creek, CA, who've been at it since 1975. I like how the piece on Wired.com opens:

Before SimCity -- even before Dungeons and Dragons -- back when "computer" was a job title, people still found ways to vaporize countless hours of free time designing and maintaining private universes. In the analog world, such parallel realities were built with tweezers, glue and a spouse's permission to cover the basement with papier-mâché massifs and plywood plains.

And this, on the system that runs the layout:

The society's control systems are a steampunk fantasy: a roomful of vintage 1930s magnetic relays once used to route phone calls, clacking like mechanical dominoes with every move the amateur engineers make. A full complement of 30 members can run 10 individual trains simultaneously on the layout, though only a dozen or so are required for basic operation.

Giant Model Railroad Is an Analog SimCity [via Boing Boing]

More:
Rod Stewart in Model Railroader Magazine

A PAC for geeks?

Introducing Syn/Ack Pac, a Political Action Committee for "SysAdmins, Tinkerers, CodeMonkeys, Makers, Technologists, Warranty Voiders, and Geeks of all types."

Why Do Geeks Need a PAC? Non-profit groups like the Electronic Frontier Foundation, Public Knowledge and many others do a great job evangelizing, lobbying, and litigating on our behalf. But as non profits, they're unable to particpate in the political process. That political void is what SYN/ACK PAC seeks to fill, bolstering the efforts of our non profit friends with our participation in campaigns and elections, we'll make sure we elect members of Congress who will represent our beliefs.

Tangible drum machine

Here are instructions for building a drum machine with a tangible visual interface. A camera above the paper drum board reads the positions of physical objects and translates them into sounds, as indicated on the labels on the objects. It looks fairly easy to make, with most of the components from paper and card.

The d-touch Drum Machine

Metallurgical eye candy

An alloy of 1.3% copper, 0.3% magnesium, and 0.3% manganese in aluminum, etched with potassium permanganate and lye.

So I woke up this morning all pumped up to blog about metallography. If you don't already know, metallography is a type of scientific microimaging that involves mirror-polishing metal surfaces and then etching them with various reagents to reveal their microstructures, which are often of breathtaking beauty.

"Griffith Cannon Flash," by Dr. Frederick E. Schmidt, from the iron of a cannon used at Gettysburg.

Unfortunately, there aren't a lot of these images online. ASM International, the big metallurgical professional society, has a large online database of metallographs, but it's locked away behind a members-only paywall. Except for a couple of skimpy .PDFs (2007, 2008), even the winners of their annual International Metallographic Contest seem to go largely unpublicized.

Which is a shame, not only because the images themselves are so beautiful, but because they could inspire a whole culture of amateur and artistic metallographers that does not, as far as I can tell, presently exist. Which fact also surprises me, by the way, because the equipment and techniques of metallography are very accessible to amateurs, especially relative to other modern methods of materials analysis.

"Grain structure in CC cast 3304 aluminum alloy," by Elana Naez.

If you know of anyone who's making metallographs as a hobby or as a means of personal artistic expression, please drop me a link in the comments.

Motorcycle brake rotor repair kludge

Straighten brake rotor.JPG

My dad recently took a minor tumble on his motorcycle. He's fine, but the bike was banged up a bit, including a bent brake rotor. Consensus among his buddies in the Magna Owners of Texas was that the rotor would have to be replaced, but of course they're pricey, and since the rotor was "shot" anyway, Dad figured he might as well try to straighten it and see what happened.

Here's what he did, in his own words:

Since I had mounted the tire/wheel on the axle in my vice to polish the wheel, it was a simple matter to rig up the "feeler" shown in the first picture to check out the rotor flatness. Just a piece of copper wire about AWG 7 to 9 or thereabouts -- I had in my electrical junk box. With a light behind the setup, one can use the reflection of the end of the wire from the rotor surface to obtain a very sensitive indication of warp when one spins the tire/wheel. Brought it back to planar using a soft face (brass) hammer. Go slow, it takes some time. "Sneak up on it" by whacking gently, measure, whack a little harder, measure, etc. until it yields just a bit.

Then, concerned that the rotor needed to be flatter than he could detect with the naked eye, he rigged up a second jig to test it:

Read full story

LEGO combination safe

Wow, a LEGO combination safe!

Brand new antique humanoids

According to a piece on BotJunkie (translating a piece on Japan's Robot Watch), a small army of vacuum tube robots from the 50s and 60s, built by Aizawa Zirou, have been unearthed in a warehouse, many of them apparently brand new. I love the Google translation:

"Were sleeping in a warehouse until it's released by the packaging. We look at the state and restore the dynamics at the time."

Got it.

Awesome Retro Robots Revealed In Japan

DIY HD home theater projector

Assemble your very own HD home theater projector using these DIY kits from G&P Optoelectronics. Combine the optics, housing, lighting, and electronics bundles and with luck you'll be watching your favorite episodes of Make: Television in glorious 1280x720 HD in no time.

DIY HD projector for under €499 [via slashgear]

How-To: Homemade sunscreen

Scoochmaroo shares this recipe for basic sunscreen free of the umpteen additives used in commercial varieties.

Sunscreen is intended to shield your skin from harmful UVA and UVB rays. These can cause premature aging, and more tragically, skin cancer. But commercial suncreens often involve more nasty chemicals than necessary.

By making your own sunscreen, you control exactly what goes in!

In addition to some natural oils and emulsifying wax, the ingredients list calls for either zinc oxide or titanium dioxide as a sun-blocking agent (both can be found from online suppliers). Read on for the how-to over @ Instructables

Beat-slicing with OTTO

CDM points out this very sweet beat manipulator interface by Luca De Rosso. The project, better known as OTTO, makes use of an Arduino board, MAX/MSP software, and an array of LEDs + switches to create a very intuitive and approachable experience for musicians. -

OTTO is a new musical instrument for beat-slicing, the technique that allows to create complex and variegated rhythm sections by using just one rhythmic audio sample, cutting it into little pieces and rearranging them in time. OTTO provides a hardware solution with a strong visual feedback, to allow the musician to control the audio sample as if it was in his hands.

Circular sequencer devices really seem like a step in the right direction for audio hardware - much more intuitive for loops. More demo vids and source documentation/downloads available on the OTTO site

Explaining voltage on FMCG

In this clip from FMCG, Ken responds to Jeri's capacitor deconstruction with his own very visual (and very mechanical) demonstration of how voltage is generated and how you can build a simple capacitor, with aluminum foil and plastic, to generate charge mechanically and dump it into the cap (analogous to how a Wimshurst machine works).

I love how this was inspired by Jeri's demo and how the two of them are having a Net-carried, seemingly casual conversation, marveling over the miracles of science. I don't know about you, but this sort of thing makes me strangely happy.

BTW: Jeri's capacitor demo is cool too, but unfortunately, the sound craps out at the end.

FMCG

Etched-brass modular synth

This supremely cool analog synth with a gorgeous etched-brass faceplace showed up on Steampunk Workshop, via the German synth site Synthesizer Database. The builder is Moritz Wolpert. Apparently, from the Google translation, all the knobs and handles were turned by hand on a lathe and the faceplace was hand-lettered, decorated and etched. The project took him two years.

Schaltzentrale [via Steampunk Workshop]

New in the Maker Shed: Desktop Onager

MKRTL2-2 copy.jpg
This Desktop Onager is constructed out of only wood and twine. That's right, no metal parts here! These types of war machines were the predecessors to cannons and modern artillery. This desktop model uses the torsion skein for all of its power. Using this ancient power mechanism, it can launch the wooden projectiles up to twenty feet.

More about the Desktop Onager

Sparkfun open-sources hardware kits

Our friends over at Sparkfun have announced their decision to officially make some of their kits open source. Nathan and company have always been supporters of OSH, but now they're going to be putting links to the engineering files up to at least some of their kits. The first is the ClockIt kit, an alarm clock kit built around the ATMega168. The listing for the kit ends with links to the Eagle files (licensed under CC v3.0 Share-Alike), the schematic, the source code, and a link to an "Improve Source Code" forum posting. Nice. "One of the great things about open source is the ability to say 'Hey, I'm pretty sure this works, but it may not be the best way to do it. Can you help me out?,'" says Nathan Sheidle.

ClockIt

Skeleton mirror

This is a cool skeleton mirror, anybody able to laser cut mirrors at home? Via Street Anatomy.

More:

Super skull roundupalooza

Circuit board latch hook rug

Rachel @ CRAFT points us to this rad circuit board latch hook rug by Red Tarts. I think I just realized Ineed a new bath mat.

New version of NETLab released

The New Ecology of Things Lab at Art Center's graduate Media Design Program has released a new version of their NETLab Toolkit. This is a system for more easily connecting microcontrollers to computers, especially targeted at those who may be new to hardware and programming. In this video, Professor Philip van Allen of the Media Design Program shows how you can use NETLab to easily connect a a sensor to an Arduino and to Flash on a desktop machine.

Here's the basic product description:

The NETLab Toolkit is a free set of software tools that enable designers to easily "sketch in hardware". With no programming at all and working in the familiar environment of Flash (or Processing or MAX/MSP), designers can hook up a physical sensor (e.g. a knob) and immediately get that knob to control a motor or a video projection. The toolkit works with a wide range of sensors, wireless sensors, input from the Wii Remote, controls motors and LEDs, communicates with MIDI devices, controls sound, graphics, and video in Flash, and communicates with DMX computer controlled lighting equipment, all with a simple drag-and-drop interface (of course, programming hooks are provided as well).

NETLab Toolkit

Breathtaking papercraft castle

By way of fellow papercraft enthusiast Cory Doctorow comes images of this incredible castle, posted on Tokyobling. Tokyobling explains:

I had the immense opportunity to see this wonderful paper craft art installation by a genius of the name of Wataru Itou, a young student of a major art university here in Tokyo. The installation is hand made over four years of hard work, complete with electrical lights and a moving train, all made of paper! Clearly, this man must have created one of the most stunning examples of Paper Craft in the world? At the exhibition you will also have the chance to see a video showing Mr. Itou at work in his studio, cutting and folding piece by piece. The exhibition is called Umi no Ue no Oshiro (A Castle On the Ocean ), 海の上のお城. It is exhibited at Uminohotaru, a place which in itself is a major attraction: a service area in the middle of the ocean, right between Tokyo City and Chiba Prefecture.

A Paper Craft Castle On the Ocean [via Boing Boing]

Lost Knowledge: Timbrel vaulting

The twice-monthly Lost Knowledge column explores the possible technology of the future in the forgotten ideas of the past (and those just slightly off to the side). Every other Wednesday, we look at retro-tech, "lost" technology, and the make-do, improvised "street tech" of village artisans and tradespeople from around the globe. "Lost Knowledge" was also the theme of MAKE, Volume 17

This week, we look at the largely-lost Medieval art of timbrel vaulting structures and the related, more modern (late 19th century) system of interlocking terracotta tiles which create what are known as Guastavino domes, after their inventor, Rafael Guastavino.

Low-Tech magazine has an excellent introduction to timbrel vaulting and Guastavino domes, called "Tiles as a substitute for steel: the art of the timbrel vault." Here's an excerpt:

The method of timbrel vaulting was developed in the 14th century around the Mediterranean, although its precise origins are unknown. The timbrel vault is also known as a "masonry vault", "Catalan vault", "tiled vault", "laminated vault", "flat vault" and "layered vault" (derived from Spanish, French, Italian and Catalonian descriptions).

A roof of tiles

Timbrel vaulting differs substantially from the Roman method of arch building, which relies on gravity. A Roman vault consists of a single layer of thick, wedge-shaped stones (see below).

The timbrel vault does not rely on gravity but on the adhesion of several layers of overlapping tiles which are woven together with fast-setting mortar. If just one layer of thin tiles was used, the structure would collapse, but adding two or three layers makes the resulting laminated shell almost as strong as reinforced concrete.

The result defies common sense, because a timbrel vault is very thin compared to a Roman vault, while at the same time it is capable of bearing much higher loads. This of course enables wider spans and gentler curves.

Read full story

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