![]() We doubt this process can be optimized enough to produce astronomy-grade mirrors for visible light, but it still has a lot of potential applications. Maybe a fiberglass radio astronomy dish could be pressure-formed directly with a rig like this? A little edge support for the resulting shiny taco shell and the mirror was capable of the required degree of destructive potential. ’s first attempt at supporting the film with spray foam insulation was a bust, but the later attempt with fiberglass mesh worked great. After curing, a few puffs with a bicycle tire pump forms the curve and stretches the film even smoother. The metallized Mylar space blanket, stretched across a wooden frame to pull out the wrinkles and folds, is applied to a circle of epoxy on the platen. A sheet of PVC with a recessed air fitting forms the platen. We’ve covered pressure-formed plastic domes before, and this process is similar. Pressure-forming was a great choice for ’s mirror. But a big, shiny mirror for your solar death-ray needs is another matter, which is where this pressure-formed space blanket mirror might come in handy. Whether you’re building a microwave antenna or a long-distance directional microphone, suitable commercial dishes aren’t that hard to come by. Parabolic reflectors are pretty handy devices. Posted in Solar Hacks Tagged mylar, parabolic mirror, reflector, solar Here´s another way to make a more durable mirror also with mylar as the reflecting element, however the quality of the resulting mirror is not as good. ![]() One obvious problem with this technique is the loss of the vacuum after some time, about an hour according to the author. In this other video, you can see the reflector in action burning stuff. The atmospheric pressure on the mylar film will take care of the job, and magically you get a nearly-parabolic reflector ready for work. Extract the air from a little hole in the lid that was previously drilled, and tape it to prevent the loss of the vacuum. ![]() Here´s where the vacuum is needed to force the film into parabolic shape. After you´re done with this, you end up with a nice flat mirror. Cut a circle of mylar slightly larger than the lid, and tape it all around, taking care of stretching the mylar in the process. The idea is so simple that it´s almost like cheating. You need a way to make a partial vacuum though. One of the easiest ways we have seen is that of, who uses nothing more than a trash can lid, mylar film, and tape. The satellite communication industry relies on the highest quality parabolic antenna/satellite communication dishes to provide accurate communications.Parabolic reflectors for solar applications are nice stuff, and making your own is a great project in itself. Aluminum Parabolic Antenna Reflectors & Satellite.The unattended parabolic solar cooker requires an imprecise parabolic. Making a Parabolic Reflector Out of a Flat Sheet. ![]()
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