You can look at your production schedule and say, We are supposed to calibrate next month, but next month will be busy, so let s calibrate the gage this month, said Dalgleish. Gage management and calibration software, as well as checking the tools on a daily basis, can help keep the tools on the shop floor and operating at optimal levels. The ISO Guide 25 defines verification as confirmation by examination and provision of evidence that specified requirements have been met. Unfortunately, neither of these definitions yields an unambiguous statement. Consequently, several of my colleagues and I have developed a short checklist for ensuring that all aspects of a calibration are addressed.
Calibration is a highly technical topic focused on quantitative issues.
Verification may also result in a business decision such as downgrading or declaring a piece of equipment obsolete. Most tolerances are set in the design phase. The calibration certificate includes information about the accuracy of the instrument or gage under consideration, typically expressed as either an uncertainty statement or as a maximum permissible error. The designer of a tight toleranced product is well advised to seek out the calibration information on the instrument or gage that will be used in the subsequent measurements. The uncertainty of measurement can be no better than that state in the calibration certificate.