Since its origin in the late 19th century when a magnetic compass was used to detect defects in magnetized cannon barrels, the selection of the right magnetic particle inspection system could be challenging.
So you’ve designed a high performance bearing or friction-free coupling, and the first thing you are asked is: What is its actual restraining torque? You’ve done your best to make something unmeasurable, and now you’re being asked to measure it.
The reality is that it would be pretty hard to say “no” to this question. To illustrate this point, I have taken a single new process and analyzed it from a nondestructive test examiner’s point of view.