There's an interesting parallel when you get to the edge of your measurement resolution--with a chop saw or similar it might be 1/64" but with a lathe it's more like 0,0005"--where the "eye" takes over and you're doing it by feel. It's the same judgments and reactions, although the effects are magnified by 30x, it's really the same skillset--steady hands, careful judgment, and measure twice, cut once.