Method for determining the position of a part in an orthonormal frame of reference based on a structure of a numerically controlled machine tool

A method for determining the position of a part in an orthonormal frame of reference based on a structure of a numerically controlled machine tool in order to determine the trajectory of a tool for performing an operation on said part, the method including the steps of:

• holding the part in position on a fixed carrier inside an enclosure of said machine tool, so as to arrange a through-hole comprised in the part such that it faces a through-orifice comprised in the carrier, said hole opening out in its entirety inside said orifice,
• illuminating, using a light source, so as to emit light radiation from the carrier towards an optical measuring instrument arranged inside the enclosure of the machine tool, through the hole and the orifice,
• reading the part using the optical measuring instrument so as to determine the position of said part in the orthonormal frame of reference;
• said method comprising, before the illumination step, a step of integrating the light source into the carrier.