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Homemade Frame

Some scrap plywood and a sheet of plexiglass fitted with a few cents’ worth of hardware is all it takes to get those must-frame items out of your drawers and onto your walls. This framing project can be built to suit, but for the sake of a starting point, I’ve... Read more »

One-Ton Linear Servo

RC hobby servomotors were just made for hacking. What’s not obvious is how much you can hack them — with a few tricks, you can use a servo to control almost anything. Hobby servos consist of a DC gear motor, a potentiometer (usually 5K), and a control circuit. The output... Read more »

Carbon Fiber Primer

It seems as though nearly everything “high performance” these days boasts some amount of carbon fiber in its construction. Originally used in aerospace, carbon fiber has moved into the mainstream and can be found in luxury automobiles, mountain bikes, and sports equipment. Some laptops and cellphones even use printed decals... Read more »

Urban Guerrilla Movie House

Rather than lamenting the slow death of drive-in theaters, I decided to build my own, mount it on an adult tricycle, and take the movies anywhere there’s an AC outlet. Vibrant online communities of DIY projector enthusiasts have ironed out the kinks and built the focal calculator software tools, and... Read more »

Backyard Biodiesel

Biodiesel is vegetable oil (often used) that’s been chemically converted into a fuel thin enough to spray through a diesel fuel-injection system. No special equipment is needed to “cook” a small batch of biodiesel that will work in any diesel engine, from a model airplane to the family car. Read more »

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