Retrotechtacular: So You Want To Be A Weldor

September 10, 2015 by Kristina Panos 27 Comments

Welding is one of those things that takes minutes to learn and years to master. It requires coordination, strength, and a good pair of eyes. This vocational guidance video from the early 1940s touches on these points and more for those considering careers in welding. The narrator jumps right in, discussing welding types, equipment operation, and employment opportunities in both the welding field itself and other fields that use welding techniques.

Oxy-acetylene welding is one of the oldest methods of fusing metal. A flame fueled by a specific mixture of pure oxygen and acetylene gas heats the metal welding rod and the work piece to plasticity, which allows them to join together. An oxy-acetylene setup can also be used to cut metal, though a special cutting torch with a kind of oxygen turbo boost lever is required. The work piece is heated to red-hot at the point along the edge where the cut will start. The oxygen-rich flame will cut right through the piece.

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ARM Programming On Mars

September 10, 2015 by Al Williams 39 Comments

Before you overreact to the title, keep in mind the latest version of Eclipse is code named “Mars.” It is always a bit of a challenge to set up a generic ARM tool chain. If you don’t mind sticking to one vendor, shelling out a lot of money, or using Web-based tools, then you might not have this problem. But getting all the tools together can be annoying, at best.

[Erich Styger] works with students and knows they often stumble on just this step so he’s provided clear documentation for getting Eclipse, the ARM gcc compiler, and a full set of tools installed. He focuses on Windows and the Kinetis platform, but the steps are virtually the same regardless. Just get the right tools for your operating system and skip the Kinetis-specific parts if you don’t need them.

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Want A Low-cost ARM Platform? Grab A Prepaid Android Phone!

September 10, 2015 by Adam Fabio 113 Comments

What would you pay for a 1.2Ghz dual-core ARM computer with 1GB RAM, 4GB onboard flash, 800×600 display, and 5 megapixel camera? Did we mention it also has WiFi, Bluetooth, and is a low power design, including a lithium battery which will run it for hours? Does $15 sound low enough? That’s what you can pay these days for an Android cell phone. The relentless march of economies of scale has finally given us cheap phones with great specs. These are prepaid “burner” phones, sold by carriers as a loss leader. Costs are recouped in the cellular plan, but that only happens if the buyer activates said plan. Unlike regular cell phones, you aren’t bound by a contract to activate the phone. That means you get all those features for $15-$20, depending on where you buy it.

The specs I’m quoting come from the LG Optimus Exceed 2, which is currently available from Amazon in the USA for $20. The same package has been available for as little as $10 from retail stores in recent weeks. The Exceed 2 is just one of several low-cost Android prepaid phones on the market now, and undoubtedly the list will change. How to keep up with the current deals? We found an unlikely place. Perk farmers. Perk is one of those “We pay you to watch advertisements” companies. We’re sure some people actually watch the ads, but most set up “farms” of drone phones which churn through the videos. The drones earn the farmer points which can be converted to cash. How does this all help us? In order to handle streaming video, Perk farmers want the most powerful phones they can get for the lowest investment. Subreddits like /r/perktv have weekly “best deals” posts covering prepaid phones. There are also tutorials on rooting and debloating current popular phones like the Whirl 2 and the Exceed 2.

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Kids And Hacking: Blind Robotics

September 10, 2015 by Al Williams 21 Comments

If you are a Hackaday reader, it is a good bet that when you were a kid there was some adult who infected you with the madness you have for science, engineering, tinkering, or whatever it is that brings you here. Maybe it was a parent or a teacher. For many of us, it was a local ham radio operator. But it was probably someone who had the passion for this kind of thing and you caught it.

Paying that debt forward can be very rewarding. Schools and youth organizations are always looking for people to share their passions with kids and at the right age and the right school, you could be that one push that moves a kid off a bad path.

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Sinterit Pulls SLS 3D Printer Entry Level Price Down To Just $8k

September 10, 2015 by Brian Benchoff 27 Comments

Almost exactly two years ago, news of a great revolution in 3D printing carried itself through blogs and tech columns. Patents were expiring, and soon the ‘squirting filament’ printers would be overtaken by a vastly better method: selective laser sintering. In the last two years, the market has been markedly silent on the possibilities of SLS technology, until now, at least. Today, Sinterit is launching their first printer. It’s an SLS printer that builds objects by fusing nylon powder with a laser, producing things with much better quality than filament-based printers.

The Sinterit Lisa is a true laser sintering printer, able to create objects by blasting nylon powder with a 5W laser diode. Inside this box that’s about the same size as a laser printer is a CoreXY mechanism to move the laser diode around, heated pistons, cylinders, feed bed and print bed for keeping the print volume at the right temperature and the top layer perfectly flat. The layer thickness of the printer goes down to 0.06 mm, and the maximum print size is 13 x 17 x 13 cm. Material choice is, for now, limited to black PA12 nylon but other materials are being tested.

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3D Printed Kinetic Art

September 10, 2015 by Brian Benchoff 2 Comments

Artificial muscles and soft robotics don’t get the respect they deserve, but [mikey77] is doing some very interesting work with artificial muscles that can be made on just about any 3D printer.

Like other artificial muscles and soft robotic actuators we’ve seen – like this walking sea slug and this eerie tentacle – [mikey77]’s muscles are powered by air. Instead of the usual casting method, he’s printing these muscles from Ninjaflex, a flexible plastic that is compatible with most 3D printers.

As they come off the printer, these 3D printed pneumatic muscles leak, and that means [mikey77] has to seal them. For that, he created a sealant out of Loctite fabric glue thinned with MEK. The addition of MEK dissolves the outer layer of Ninjaflex, allowing the glue to bond very, very well to the printed muscle.

So far, [mikey77] has created a pneumatic flower that blooms when air is added. He’s also created a muscle that can lift more than four pounds of weight with the help of a 3D printed skeleton. It’s a great way to experiment with flexible robots and pneumatic muscles, and we can’t wait to see what weird creatures can be created with these actuators.

Thanks [Lloyd] for sending this one in.

Phone Scope Build Uses Old Optical Drive

September 10, 2015 by Al Williams 13 Comments

It is hardly news that you can use your smart phone as a really crummy oscilloscope. You can even use it as an audio frequency signal generator. There are also plenty of projects that allow you to buffer signals going in and out of your phone to make these apps more useful and protect your phone’s circuitry to some degree. What caught our eye with [loboat’s] phone oscilloscope project was its construction.

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