Massimo Marconi, Author at Il Grattavetro

Ten mistakes to avoid during parabolizzazione

Dec 28, 2014Massimo Marconi2 CommentsParabolizzazioneparabolic mirror

Surely, especially at the first mirror, if they can do many more, I limit myself to this because besides being quite common, to the “experienced” personally and I guarantee you my mirror does not at all acceptable… Some of these conditions have general validity, even if they become particularly important during the phase of

Turned down edge: correction with sub-diameter

Dec 14, 2014Massimo Marconi2 CommentsCorrection of defectssub diameter

One of the most common defects during polishing operations or sfericizzazione is the occurrence of the turned down edge. HOW DOES it PRESENTS With “turned down edge” o TDE ( turned down edge) defining a limited circular ring close to the edge of the mirror, which rapidly increases its radius of curvature with respect to the remaining surface

W stroke – variants and applications

Sep 26, 2014Massimo MarconiTechniques

We have seen how the past with W races constitutes one of the most effective methods for the approximation of the parabola starting from the spherical surface. Let us examine some variations of this technique to accentuate or diminish the effect of the processing in some areas of the surface. The W race presupposes a constant displacement and linear , orthogonal to the direction

Strokes “W”, sub diameter 50%

Sep 7, 2014Massimo MarconiTechniquesstroke, sub diameter, tools

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

Sub diameter tools, general aspects.

Aug 26, 2014Massimo Marconi5 CommentsTechniquessub diameter, tools

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

Strokes “W”

Aug 15, 2014Massimo MarconiTechniquesstroke, parabolic mirror

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

Stroke 1/3 COC

Jul 17, 2014Massimo MarconiTechniquesstroke, parabolic mirror

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

Chordal Stroke

Jul 12, 2014Massimo MarconiTechniquesstroke, parabolic mirror

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

A Foucault Tester homemade

Jul 6, 2014Massimo MarconiFoucault Test Foucault, optics, tester

A Foucault Tester, with fixed light source fixing to be carried out with devices which commonly have at home (webcam and a pen / USB stick ) screwdriver , hacksaw and simple components purchased from Brico with little expense. below of the components you found the exploded, assembly instructions, list of materials and some support attachments.