I
I work in the cable and wire industry and application of SPC seems to be somewhat hard. The automotive specs almost allways include requirements on minimum and average wall thickness plus minimum and maximum diameter of the insulation. The specs are not written by engineers taking into regard the fantastic possibility of SPC and Cpk's above 1.33 for all dimensions. According to my experience I have not yet seen a spec where these four dimensional requirements have not been conflicting with eachother, i.e when diameter can be held at Cpk > 1,33 either min or av wall thickness will be < 1.33. To satisfy the customer and mostly the assesor we have choosen diameter to be a characteristic to study. I would like to know if anyone else have any good solutions on this problem? Please don't tell me to discuss it with the responsible engineer writing the specs cause they just won't listen.
Isaberg
Isaberg