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  • WORKING MIRRORS
    • - Environment and tools
    • - Techniques
    • - Materials and abrasive
    • - Roughing and grinding
    • - Polishing
    • - Parabolizzazione
    • - Correction of defects
    • - Secondary mirror
    • - Constructive Report
    • - Science and Technology
  • OPTICAL MEASUREMENTS
    • - theoretical aspects
    • - Foucault Test
    • - Ronchi Test
    • - Interferometria
  • DOBSON
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    • - building elements
    • - Handling and transport
  • FORUM
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    • - Processing parabolic mirror
    • - Optical Test
    • - DIY
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Category Archives: Correction of defects

Home / Archive Category: Correction of defects

Curvature Correction with Sub-diameter

Apr 4, 2015Massimo Marconi13 CommentsCorrection of defectsparabolic mirror, sub diameter

We saw in a previous article the general operation of the racing technique with sub-diameter. On that occasion, we examined the aspect relating to processing by identifying the zones or circular sectors in which the material removal takes place more or less effectively. Let us now go into more detail about the effects that this process produces

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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

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