1The CMM programs in Zeiss Calypso were correct — measurement followed the drawing exactly. But the drawing, grown over years, did not fully describe what matters functionally. So the report flagged deviations although the quality was fine.
2The functional knowledge existed at Festo — in the experience of its people. CSL analysed with them how production recognises good parts, and made that knowledge explicit.
3Production volumes of the successful product were to be increased massively, and Festo deliberately secured its know-how first: CSL translated it into ISO GPS drawings that conform to the standards, involving everyone concerned.
4Based on the new drawings, CSL wrote new CMM programs. Non-conforming values are now plausible for production and can be corrected in a targeted way.
5With the new specification, the evaluation is the same across all lots. A deviation in the report is now a reliable signal, and the internal complaint loop is gone.
A CMM program can only verify what the specification describes. Only the ISO GPS drawing review and the rebuilt inspection plan in Zeiss Calypso together turned the measurement results into a reliable basis for decisions — reproducible lot after lot.