You’ve made the threaded parts and are confident they are okay because you’ve checked them with your gages. Then you get the call from the customer advising you that their gages have rejected the parts and they are demanding re-work or replacements ASAP.
One would think that when you get your thread ring gages calibrated and there are no red flags raised by the reported data you’re good to go. Unfortunately, this sea of tranquility can end up drowning you if you have misinterpreted the reports—something that happens when disputes arise.
A reader emailed me after reading some of my rants on thread ring gages dealing with the problems that come up in their use and calibration. But he added another dimension to the problem since he is in the calibration business: How do the Europeans deal with their solid thread ring gages?