Hexagonal cutting for ELT-M1

Alexandre Bacouel; Xavier Tonnellier; Jean-Pierre Cardoso; Jean-Frédéric Lesien; Gilles Chaussat; Denis Faure; Camille Frapolli

doi:10.1117/12.3020307

26 August 2024 Hexagonal cutting for ELT-M1

Alexandre Bacouel, Xavier Tonnellier, Jean-Pierre Cardoso, Jean-Frédéric Lesien, Gilles Chaussat, Denis Faure, Camille Frapolli

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131003S (2024) https://doi.org/10.1117/12.3020307
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Hexagonal cutting of pre-polished circular segments is one of the critical process step in the manufacturing of ELT-M1 mirrors. This enables edge-to-edge optical performance, and precise mechanical references used to align the segment during operation of the segmented primary mirror. This paper presents the novel technology developed by Safran REOSC to guarantee fast and precise referencing of all critical features, hexagonal shaping, edge sensor interface machining, cutouts handling, and throughput over one segment per day. We will analyse the machining performance over 100 mirrors, and the effect of cutting on optical surface.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Alexandre Bacouel, Xavier Tonnellier, Jean-Pierre Cardoso, Jean-Frédéric Lesien, Gilles Chaussat, Denis Faure, and Camille Frapolli "Hexagonal cutting for ELT-M1", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131003S (26 August 2024); https://doi.org/10.1117/12.3020307

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