Sometimes a customer does not need their CMM to be quite as accurate as the ZEISS guarantee is for that specific CMM Model.  For example, they may have a DURAMAX which has a 2.5 micron volumetric accuracy.  It might have issues and fail its calibration.  The customer may then ask us to apply a more liberal tolerance like 10 microns.  In that case, they would have a certificate saying “PASSED - under 10 microns of error”.

Yes, we can and have done this.  However, it is prone to errors being 100% manual.  Year over year, we often forget and then the customer has issues with an incorrect certificate after calibration.

Per Brandon D, it is highly preferred to encourage the customer to manage this within their own quality procedures.  For example, they will receive a certificate / protocol after calibration stating “FAILED - exceeds 2.5 microns. Does Not Meet OEM specifications.". Then, the customer could write up a quality document stating that this is true but their requirements are only for a 10 micron tolerance.  Thus, the machine is performing well within the needed accuracy level.