Gentlemen, So would it be safe to assume that the best place for an encoder to be mounted would be on the screw and not mounted to the motor shaft? Also once tuned using linear compensation, with other factors being even, rotary encoders will be at least as accurate as linear scales. True?
Terry On Sat, Jul 3, 2010 at 6:57 PM, Stuart Stevenson <[email protected]> wrote: > Gentlemen, > > Generally, yes. I have never done it but I have been told that screws can > > be mapped for error, if one has the ability to make that fine a > measurement > > over the range of travel. That of course assumes your screws have > > essentially zero backlash. > > > > I used a laser tracker with <.0002 accuracy in the 120 inches of travel > on > the cinci. I was able to compensate to <.001 for the full 120 inches travel > of the X axis. EMC2 has bidirectional compensation so you can adjust for > uneven ball screw/nut wear in both directions. This is linear compensation. > Linear compensation is one part of true accuracy. > > Stuart > > -- > dos centavos > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
