Small tutorial on using "minimum" of POLSIM software for the processing of a parabolic mirror telescope, "Assisted" by the use of a simple rotating plate, even in the digging operation of the "arrow" of the initial spherical concavity. The program was written in 2007 da Martin Cibulski, and it can be downloaded as polsim.exe (download) , as other interesting Articles
This type of technique can be used in the first phase of the generation of the parabolic shape of short focal mirrors or large diameter, the mirror is always and only in the lower position. hand position ( for small tools below 15 cm)It is the one with the thumbs pushing a
In the past 1/3 COC, the movement of the mirror on the tool (being the focal reduction) or viceversa (in the process of increase of the focal) They must be made by following a few simple but important rules: the center mirror and the tool at each pass must meet and the straight line virtually drawn from the center of the disc in that
Before starting any mirror processing phase, it is essential to make sure that the edges of both mirror that tool are blunted. This precaution is essential to minimize, during processing, the risk that by the sharp edge of one of the two discs coming off a flake that can slip between the two
When in processing a mirror you will reach a refined and smooth surface with abrasives in grain 800 or outside, You must establish for preparing the tool with pitch patina coverage, to proceed in the following two important final processing stages, that are the transformation of the frosted surface but opaque, in
Sub diameter tools, general aspects.
The techniques with sub-diameter tool, try to solve some of the problems that arise with the use of the full-diameter at the time when the size or the curvatures of the optical surface of the work, assume limit values in which standard techniques can be ineffective or difficult to apply or even, in some cases, counterproductive. we can summarize
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