Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V 2022
DOI: 10.1117/12.2626800
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Key challenges for the production of ELT M1 segments at Safran Reosc

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Cited by 3 publications
(6 citation statements)
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“…The requirements of high throughput (1 segment per day) and state- of-the-art bonding performance (the glue joints must last 30 years and withstand earthquakes) have conditioned the choice of a fully automated process with closed-loop glue injection. 3 There are 39 pads that are bonded to each segment, as shown on figure 2 and their positioning accuracy is generally lower than 0.2 µm relative to each other over the full segment area (1.5 m diameter). The gluing cycle lasts about 4 hours followed by a precuring time on the gluing machine and by a polymerization cycle inside a temperature controlled oven.…”
Section: Pad Bondingmentioning
confidence: 99%
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“…The requirements of high throughput (1 segment per day) and state- of-the-art bonding performance (the glue joints must last 30 years and withstand earthquakes) have conditioned the choice of a fully automated process with closed-loop glue injection. 3 There are 39 pads that are bonded to each segment, as shown on figure 2 and their positioning accuracy is generally lower than 0.2 µm relative to each other over the full segment area (1.5 m diameter). The gluing cycle lasts about 4 hours followed by a precuring time on the gluing machine and by a polymerization cycle inside a temperature controlled oven.…”
Section: Pad Bondingmentioning
confidence: 99%
“…This could allow decreasing the average surface error to 100 nm RMS or lower, where it would be limited by the performances of the metrology instruments used for this part of the manufacturing. 3…”
Section: Segment Polishingmentioning
confidence: 99%
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“…They also finished polishing comparative experiments on conventional paths and improved random paths [12] . In 2022 Camille Frapolli et al reported the smooth and polish work on M1 segment of the European Extremely Large Telescope(ELT) using smoothing tool on robotic arm [13] . This article will carry out research on the grinding processing by small tools based on a 6-axis robotic arm.…”
Section: Introductionmentioning
confidence: 99%