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
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
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
Past 1 / 3D c.o.c, alias the forward-backward centered race (or, all’americana: “center over center”), processing for abrasion, amplitude equal to one third of the mirror diameter, in which scratching of the glass is used to make a mirror (for example parabolic) is, with patience, UNIVERSAL WINNING WEAPON. Like the: The acquired new life
DESCRIPTION La pass with racing 1/3 center over center ( shortened: COC = “C. o. c.” ) is the classical stroke, the most widely used because it can be applied in all stages of processing both with the mirror above and below the tool, than vice versa. The position of the hands is the one with the palm that supports and pushes
DESCRIPTION The past is the chordal excavation technique more aggressive and effective towards our mirror. In fact it allows to remove a large amount of material in a shorter time compared to the other past. On the other hand is a technique that does not allow to obtain a regular shape, It should therefore be used only in the initial stages of blanking and up
