ANDES, the high resolution spectrograph for the ELT: RIZ & UBV Spectrographs’ Preliminary Mechanical Design

The preliminary mechanical design of RIZ & UBV visible spectrographs of the ANDES instrument is presented. Those spectrographs pose an enormous challenge in their mechanical design due to their large size, mass of their optical components and the strict stability requirements, In this paper we describe how we handle these challenges thanks to the experience gained in previous successful projects, mainly ESPRESSO.