Method for inspection of a machine part

A contactless dimensional method of inspecting a wear of a part of a turbine engine, wherein the method comprises stages in which, by means of a calculator:

• a reference plane-having a first reference frame is defined;
• by measuring said part to be inspected, a modelling of at least a portion of said part is acquired, in the form of a three-dimensional inspection grid having a second reference frame, wherein the first and second reference frames are each oriented in a predetermined manner in relation to a third reference frame specific to the turbine engine, wherein said reference plane is defined as comprising points projected according to a projection perpendicular to said reference plane, from said reference plane, towards the three-dimensional inspection grid;
• the part is inspected, in an area common to the three-dimensional grid and the reference plane, through a dedicated algorithm using a projection of points wherein:
• for said common area, the reference plane comprises a field of theoretical points which are projected according to said projection perpendicular to said reference plane, from said reference plane towards the three-dimensional inspection grid;
• for each projected point encountering the three-dimensional inspection grid, a projection distance is calculated between the reference plane and an intersection of said projected point with the three-dimensional inspection grid;
• the projection distances of said projected points encountering the three-dimensional inspection grid are compared to identify a maximum distance among said projection distances and a corresponding projected maximum wear point, wherein:
• during a comparison phase, before said comparison of the projection distances of the projected points, an initial selection of the projected points is made in which projected points not encountering the three-dimensional inspection grid are excluded,
• a minimum wear thickness of the part is determined, measured between a projection on the three-dimensional inspection grid of said projected maximum wear point and a fourth reference frame, wherein the fourth reference frame is specific to the part and oriented in relation to the second reference frame,
• said minimum wear thickness is compared with a predetermined wear tolerance range and
• if the result of the minimum wear thickness comparison is within the predetermined wear tolerance range, the part is defined as compliant;
• if the result of the comparison is outside the predetermined wear tolerance range, the part is defined as non-compliant.