The term ‘proficiency testing’ is one that every accredited calibration laboratory is quite familiar with. In basic terms it refers to a method of evaluating how well a laboratory is doing a particular calibration with respect to its claimed measurement uncertainty and how it fares with other participants.
If you’re having problems with thread measurements but the answers you’re getting from your usual sources aren’t solving them, it’s natural that you would try and get some unbiased advice from a specialist.
NO! This is not a rant about the world coming to an end due to global warming. In this column I’ll discuss the conditions required for dimensional measurement and let environmental types sort out the rest of the universe.
These two choices for bore measurement come into play when close tolerances are the order of the day and speedy, repeatable measurements are required in a production environment. Keeping these requirements in mind, instrument makers usually offer options such as hard chromed bodies or carbide pads and contacts where needed to keep wear at a minimum.
Any article on dimensional measurement will usually get around to micrometers in one form or another. This series on bore measurement is no exception even though I am only offering a brief look at the application.