On Tue, 4 Feb 2020 at 03:56, Jon Elson <[email protected]> wrote:
> I don't know if there's anybody out there with table travel > that exceeds a 32-bit integer > encoder count. Maybe not a table, but consider the spindle on a hobbing machine, fitted with an ROD271 18,000 counts per turn encoder running at 3000 rpm 24 hours a day. S32 rolls over after 40 minutes. Even a 4000 count encoder at 1000 rpm rolls over after 9 hours. 20,000 rpm spindles are common, but unlikely to use spindle-synch motion. Rigid tapping and threading reset at the start of the cycle, so are probably OK. S64 as the internal representation adds sufficient extra. Our first example rolls over after 300,000 years. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
