BiloxiBoy ) said...

But, is it "really" 3/4??? or 23/32??? Whatever happened to the good
old days when 3/4 was really 3/4?

It likely isn't even 23/32!

Here in the land of half-assed-conversion-to-metric (Canada), our plywood
and OSB are manufactured in millimetre thicknesses, despite being 4' x 8'
in the other two dimensions.

3/4" is about 19.05 mm, so it is rounded down NOT to 19 mm but to 18 mm!

18 mm is 0.70866", while 23/32" is 0.71875".

23/32" is the closest fraction (without going below 1/32" increments)
to 18 mm.

--
Calvin Henry-Cotnam
"I really think Canada should get over to Iraq as quickly as possible"
- Paul Martin - April 30, 2003
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