CNC control using DROs?

[Muzzer]

40 microns is pretty decent - about 1.5 thou. I think I might just about be able to get to that accuracy if I took care. My Japanese machine was originally claimed to be good for 10um when new but that would be with the gibs all spot on, spanking new ballscrews, following wind etc. Obviously that wouldn't be good enough for the willy waving Pootube warriors who claim to be able to "hold tenths". Yes and I'm Mary Poppins.

For a real sickener, have a look at this video where a mate of mine describes what precision actually is. 1 nanometer is a thousandth of a micron ie a good 4 orders of magnitude better than I could hope for.