> Interesting stuff Mark ..... I'm going a big off topic now but finishing plywood up here is quite confusing. Even though we are on the metric system, all that kind of plywood is still a full 4' x 8' in outside size but the thickness is in millimeters. I'll use 3/4 finishing plywood as an example but the same thing applies to all thicknesses of finishing plywood.
Well, CH, down in the states, 3/4 inch plywood isn't actually 3/4. It's almost always a 32nd under, so 3/4 inch plywood is actually 23/32, and it's usually marked as such. That's true of pretty much all plywood grades, as well as OSB and MDF. Also, sheathing and flooring plywood is slightly undersized in length and width to allow for a bit of space between sheets when nailed to studs, rafters and joists.
They do make undersize router bits specifically for cutting dadoes for plywood. I have one for half inch plywood, but I found to my surprise that half inch Baltic Birch is actually a full half inch thick, and I had to plane the sheets to get them to fit my dadoes. (Baltic Birch, a Russian product, is an interesting subject in itself. It's a very high quality plywood that comes in five foot square sheets. Why? I have no idea.)
I used metric-dimension 4 millimeter okume marine plywood to make a lapstrake canoe. This stuff is truly metric and it doesn't match any US plywood in thickness. The sheets are nominally 4x8, but as I recall slightly undersize to match some metric spec.
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