I’ve lived in a 2 measurement system world my entire life. I’m seeing a very slow transition to the metric system but it is very slow progress and we in the woodworking world may be one of the slowest segments to transition.
Every once in a while we pay a price for the confusion that comes from having 2 measurement systems. The shaft that supports the tool rest on my lathe looks like it is 1 inch in diameter. I wanted a different style tool rest and I ordered one with a 1 inch shaft. When I went to install it, I discovered that the hole is actually a 25 mm hole. 1 inch and 25 mm are very close, but you cannot put a 1 inch shaft in a 25 mm hole.
I really wish we could get beyond this 2 measurement system someday. I doubt that I will see it in my lifetime.
-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.