2015-07: the contract for thin glass petals of the Adaptive Optics M4 mirror unit,
2016-07: the contract for polishing the 4-m secondary convex mirror M2,
2017-02: the contract for polishing of the 4-m tertiary mirror M3,
2017-05: the contract for polishing and integration of the 931 1.45-m hexagonal segments constituting the giant 39-m primary mirror assembly M1.
This paper reports Safran Reosc’s work progresses along these four contracts with their various challenges and more specifically those related to the mass production of the M1 segments.