Aliverti, MatteoMatteoAlivertiRIVA, MarcoMarcoRIVAMoschetti, ManueleManueleMoschettiPARIANI, GiorgioGiorgioPARIANIGenoni, MatteoMatteoGenoniZERBI, Filippo MariaFilippo MariaZERBI2020-05-182020-05-1820150037-8720http://hdl.handle.net/20.500.12386/24946Optical alignment is a key activity in opto-mechanical system Integration. Traditional techniques require adjustable mounting, driven by optical references that allows the tuning of the optics position along all 6 Degree of Freedom. Nevertheless, the required flexibility imposes reduced stiffness and consequently less stability of the system. The Observatory of Brera (OAB) started few years ago a research activity focused onto the overcoming of this limits exploiting the high metrology performances of Coordinate Measuring Machines (CMM) with the main objectives of relax the manufacturing tolerances and maximize mounting stiffness. Through the T-REX grants, OAB acquired all the instrumentation needed for that activity furthermore considering the ESPRESSO project training and testing also oriented to large scale instrumentation like the E-ELT one. We will present in this paper the definition of the VLTs convergence point and the feasibility study of large mirrors alignment done by mechanical measurements methods.ELETTRONICOenArticlehttp://sait.oat.ts.astro.it/MSAIt860315/index.html2015MmSAI..86..404AFIS/05 - ASTRONOMIA E ASTROFISICA