Work characteristics - Aggregates - granulometric Sequences - Traceability of abrasives to achieve mirrors for telescopes. CHARACTERISTICS OF WORK: As already mentioned in other articles relating to the construction of mirrors for telescopes, current amatorial making of such an object provides a raw disc of glass that go to constitute the mirror, is rubbed
The machining of a mirror for the telescope provides that a raw glass disk which will constitute the mirror, He is rubbed with its center against the edge of a second glass disc forming tool function, with the interposition of abrasive carborundum wet. The abrasive used for the heavy initial work roughing or excavation of
In the design phase of our astronomical mirror, it is essential to determine the focal length at which you want to reach, since the same focal length depends on the extent of the arrow, ie the depth of the center of the mirror with respect to its edges that we will achieve especially in the roughing phase. The formula for calculating the extent of the arrow is
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
La pass with races “W” It is the main technique used in the process of parabolizzazione. Normally it runs with mirror above and below the tool, It can also be applied in some cases with inverted positions. The position of the hands is the one with the palm which rests and pushes from the edge to "hours 8:20"And your thumbs facing the center to
Support for the mirror, necessary for the proper positioning of the same during another test is not that any device able to keep it in a safe and in a vertical position. The support can be seen as the assembly of 5 distinct elements: Panel or carrier rear structure lower supports for the support of the
Is’ the day “zero”, one in which it is decided to start the processing of its first mirror. Everything's ready: a transparent glass disk is lying on her pretty stable support, restrained but not too much by three wooden dowels. We seize another glass disc uncut and, coarse carborundum hand
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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