> 1.5 (cm) or 1 imperial unit (half inch). Can I ask why you consider consider 0.5 inches to be 'one unit' - but think 1.5 cm is not? For me, a unit is akin t

> 1.5 (cm) or 1 imperial unit (half inch). Can I ask why you consider consider 0.5 inches to be 'one unit' - but think 1.5 cm is not? For me, a unit is akin to atomicity. But units don't dictate what size something is or should be - that's what multiples are for. > Measures where moving a cut to line up to whole cm is too far and I end up working with half and quarter centimeters or awkward counts of millimeters. It's a poor tape measure that does not show mm. Similarly it would be a poor tape measure that does not show 1/32 of an inch. The fact that your measuring device shows these gradations doesn't mean your design needs to be aligned to any arbitrary subset of multiples / divisors though, surely? > I guess the "trick" is that even though 1/16, 1/8, 1/4, and 1/2 inch are all technically divisions of an inch, they all function in practice as distinct whole units that are (typically) easily converted. So when you are doing work in that scale range you have many options to match what you are working with. 1/16th of an inch isn't just technically a division of an inch. : ) When you're working down to something tiny, both measurement systems will be able to represent absolute distances just fine - do we agree on that? It's a matter of whether manipulating those numbers is easy or difficult (for me, working with wood almost always means working with integers - mm - so all calculations are delightfully easy). Refer my other post about the Leigh dovetail jig description of router bit and bush sizes - there's 4 different dividends in use in just that one short paragraph, so you have to convert them all to common denominators before doing any mental arithmetic with them.