Case-universal. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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For many years now, I have been using homemade cases made according to my own technology in my amateur radio designs.
The "P2" type enclosure is, in principle, a frameless structure consisting of a base and a lid. Both parts are U-shaped. They are made by bending from sheet steel of the required thickness so that during assembly a closed volume is obtained.
Universal frameless case: 1 - base; 2 - cover
But first, a corresponding scan is drawn on a sheet of paper, which is then transferred to a sheet of metal of the required thickness (in most cases from 0,3 to 1 mm). The marked workpiece is cut along the contour. Next, all the necessary holes, bending and flanging are performed. The latter often provides for "bunches" - holes elongated with a beard for mounting screws.
Such a constructive solution allows even beginners in plumbing and tin work to manufacture light, comfortable and fairly durable cases ranging in size from a matchbox to a large-sized TV in poorly adapted home workshop conditions. The undeniable advantage of this technology is that the U-shaped base does not impede access during layout and wiring.
The following options are equally acceptable for connecting the base and cover: using angles and screws; using flanging, screws and nuts; with the help of flanging, "bulk" and screws. Quickly and reliably in any version. And in order for the front panel in the assembled case to look "branded", the front edge of the cover should be flanged inwards. It is advisable to attach the carrying handle not to the geometric center of the cover, but in a place that will best ensure balance when possible carrying the future device.
After final processing and test assembly, the cover and base must be painted. For example, hammer or colored (preferably imported water and heat resistant) enamel.
Author: A. Shimanaev, inventor, Lyskovo, Nizhny Novgorod region.
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