Pardon my French!
This is a term used by tool & die makers to indicate unobtainable levels of (perceived) precision. Why do I bring this up?
Last week, I was advising a reader on selecting pin gages for use in measuring chamber throats. The discussion revolved around which gages to buy, and whether or not he needed both plus- and minus-tolerance gages (no, in case you’re wondering.) He was concerned about their variance of .0002″ (that’s 2/10,000th of an inch, or 1/20th ...Continue Reading →