Method of manufacturing parts having a dimensional requirement akin to a tolerance stack-up

Method of manufacturing parts produced with a manufacturing device, where each part must satisfy an overall dimensional requirement on a specific dimension of said part, said overall dimensional requirement being akin to a tolerance stack-up comprising at least two sides, each side corresponding to a characteristic dimension of the part, in which:

• the overall dimensional requirement is fixed so that the specific dimension of the parts has an average μG and a standard deviation σG in an overall area of acceptance constructed from one or more statistical criteria;
• a reference dimension is selected from among the characteristic dimensions comprising the tolerance stack-up, and an average μref and a standard deviation σref of said reference dimension are calculated from a sample of parts taken from among the parts produced with the manufacturing device;
• an area of acceptance for the other characteristic dimensions of the tolerance stack-up is calculated from the overall area of acceptance and from the average μref and the standard deviation σref calculated for the reference dimension, the area of acceptance being constructed with the statistical criteria or the same statistical criteria as the overall area of acceptance;
• the manufacturing of parts without verification of the reference dimension is controlled by using the area of acceptance calculated for the other characteristic dimensions of the tolerance stack-up by adjusting the regulating parameters of the manufacturing device so that each of the other characteristic dimensions of the tolerance stack-up is included in the corresponding calculated area of acceptance.