A two (or three) dimension comp file could work wonders to straighten the motion. To be able to correct Y and Z motion per X motion at the same discreet points chosen for the bidirectional compensation would be a very good thing. Correcting X and Z for Y motion and correcting X and Y for Z motion would complete the package. The interpolation for the correction values would make a machine motion much straighter.
This would not perfect the machine as lead screw lost motion and gib/linear (guide ways) slop would still be present until mechanically corrected. A slight warp in the bed of a lathe would be easily corrected. thanks Stuart On Sun, Nov 24, 2019 at 4:08 PM Gene Heskett <[email protected]> wrote: > Greetings all; > > I see in Documentation.pdf at about page 375 its mentioned that if a comp > file is used. then backlash is ignored. That seems a bit odd, until one > realizes that COMP in this case is being used to correct for possible > non-linearities in THAT screw. That detail could be clarified, but I've > no suggestions how. > > What I am doing in the Sheldon, is compensating X based on Z position, so > that it turns relatively straight in spite of a few thou of bed wear. > IOW a different critter entirely. It also took several days to measure > with a rifle bore sighting laser since it turned out to be temperature > sensitive. For final readings I loosened the foot ball joint and left it > loose for several days before snugging it back up. That seemed to have > helped stabilize the measured error. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
