On Mon, Mar 31, 2014 at 11:17 AM, andy pugh <[email protected]> wrote:
> > > Do you know if the request is from people running metric or imperial > > machines? 3 figures after the decimal point seems about right for > > metric, but i'd think 4 would be better for imperial. > > I think that both requests were for users of metric. I don't know why > they wanted more digits, though I guess if you have 0.1um linear > scales you might want to get your money's worth. > If you are doing optics in metric units, then 6 digits after the decimal point is probably what you want. On our machine with the current tuning, the 6th digit dithers a little more than I would like. However, we are going to tune it better after the current job is done. I figure people will still pay for improvements until they can't measure them, and Zygo can measure surfaces to .1nM in height. Hydrostatic grinding spindles that have <5nM error motion are available. For now, I'm glad we don't have the money for a clean room, but it might happen. I don't know anyone using linuxcnc on such a machine, but it wouldn't surprise me. ------------------------------------------------------------------------------ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
