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.
Like their plain plug gage counterparts, plain rings appear to be a relatively simple matter when it comes to calibrating them since there is only one feature to be measured. But, there’s always a ‘but’, the process is not as simple as you might expect.