I won't question your math John but I know after my first run of routering for the shelving in the cabinets, it was surprisingly sloppy. I think most cabinet makers prefer a nice snug (but not too tight) fit. I bought a 19mm router bit right away and finished up with that. I think there might have been some kind of an idea to make the 4x8 sheets metric, not sure about that. This info below says that metrication started here in '70, I thought it was after that ....
"Metrication in Canada began in 1970 and ceased in 1985. While Canada has converted to the metric system for many purposes, there is still significant use of non-metric units and standards in many sectors of the Canadian economy and everyday life today. This is mainly due to historical ties with the United Kingdom, the traditional use of the imperial system of measurement in Canada, proximity to the United States, and strong public opposition to metrication during the transition period."
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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