High Frequency Start Box

start_box

When welding with an AC arc welder, it is often necessary to “scratch start” them to get the arc going. For those unfamiliar, it is just like it sounds. You drag the head across something just like a giant match. There are some that come with an arc stabilizer or “high frequency starter”. This is preferred, but they can be hard to find. [Bill] shows us how to make one of our own. Though you may have an easy enough time finding a big transformer, you might run into some difficulty finding the capacitors, and tungsten spark gaps. If you manage to get your hands on them, you can follow [Bill]’s schematic and build one of these starters for yourself.

Columbus Day: What Are You Working On?

Wow, Caribbean Conquest Day is such a dull holiday. If it’s a holiday at all: we’re at work today and you probably are too. We decided to post what we’re working on in hopes of breaking out of our holiday slump. Pictured above are two IR illuminator boards we assembled this weekend. We bought the kits from BG Micro. We’re planning on testing their camera blocking ability once we come up with a ~13V portable power source.

That’s what we’re doing. What have you been working on lately?

(If anyone can find a source for the welding goggles in the picture, we’d love to hear it.)

Pedal Powered Panzer Tank Built For Crashing Parties


A group from Philadelphia PA calling themselves Team pzkpfw decided to recreate a Panzerkampfwagen III, but not entirely according to the original specs. Instead of treads and an engine, they used a system of pedals, gears and chains powered by up to six riders. The team of roughly nine men spent eleven days welding beams and plates, drilling and shaping sprockets, and painting the tank a fearsome pink camouflage. They were planning on crashing the 2nd annual Kensington Kinetic Sculpture Derby with it, which they crashed last year in a pirate ship, but they ended up being too tired from their tooling around to actually do it. There’s always next year. Get a look at their promotional video after the break, or if you’ll be in the Philly area soon, “visit the tank on Frankford Ave, just north of Norris St in Philadelphia.”

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