It is often said that metrology is a method of communication and when you think about it, that’s a pretty accurate way to explain its purpose. But, too often, there are underlying assumptions that can mess up the communication to such an extent that the most precise measurement can be of little functional value.
This problem can arise in all measurement situations but probably occurs more often when features on machined parts are involved. One reason for this is part drawings that imply certain characteristics but don’t specify them so they are not top of mind when it comes to determining the procedure to be followed and, of course, the hardware to be used.