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Articles by Hill Cox
I regularly take shots at quality auditors for some of their antics but thought that, in the interest of fairness, it was time to turn my sights on issuers of calibration reports for some of their antics.
Most threaded products such as fasteners are verified using fixed limit gages when their ability to assemble with mating parts is of primary concern.
Nothing makes life easier than having a ‘master’ for the dimension(s) you have to measure. But a simple request for one with a dimension attached to it, for example, is not enough information to get something that will do what you want it to.
A lot of people play fast and loose with the frequency of calibration on their gages, masters and instruments.
Gage blocks are the most used physical representation of length available to companies requiring the highest order of precision for their work.
In metrology we have similar benign bits of hardware that can create havoc if misapplied, but in the grand scheme of things rarely are.
Many calibration customers become frustrated with their calibration sources because of price changes after they’ve sent a purchase order and the gages to the lab.
This question is rarely, if ever, asked but assumptions regarding the length of time involved regularly pop up, especially when measurement disputes are the situation into which such assumptions are injected.