Instead of using a flat surface use a ring and stretch transparent Mylar across one side and reflective Mylar across the other side, then pump in air between them from a great many tiny multiple ports in the ring. Instead of using a fixative to convert this air pressure induced parabolic curve into a permanent solid mirror why not just take this same idea but simply maintain air pressure and use the mirror as is? Posted in Misc Hacks Tagged cooker, death ray, dish, fiberglass, mylar, parabolic mirror, pressure forming, reflector, space blanket Post navigation 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.
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