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It’s not what you’re thinking. It stands for ‘overdue’ and nothing puts quality people into panic mode faster than the realization they’ve got some items in their system that are overdue for calibration and, of course, a quality audit is happening within a day or so.
In keeping with my recent columns summarizing the calibration of various gages, I offer this one as a catchall for the many precision hand tools used for measurements.
This column is the fourth in a series of overviews on gage calibration to give you some idea of what is involved at this level of measurement. A book could probably be written on each subject and not do the job very well so I will continue keeping it simple to avoid completely ruining your day.
In my last column I listed some basic equipment requirements for the calibration of thread plug gages so I thought it would be helpful to give mating gages the same treatment.
Thread plug gages are fascinating products when you consider the technical details that go into their manufacture and the precision they embody. To some, they look like fancy bolts and are treated accordingly.
This situation pops up quite regularly when a relatively simple feature such as the diameter of a hole in a machined part doesn’t appear to be right when the part is at the assembly stage of manufacture. Like similar disputes, the finger pointing begins and compromises are made but the problem doesn’t go away.