On Tuesday 26 November 2019 07:28:09 Kenneth Lerman wrote: > Use a cylinder square: > > https://www.ebay.com/i/312037924818?chn=ps&norover=1&mkevt=1&mkrid=711 >-117182-37290-0&mkcid=2&itemid=312037924818&targetid=541454015492&devic >e=c&mktype=pla&googleloc=1014782&poi=&campaignid=6470552628&mkgroupid=8 >1274342767&rlsatarget=aud-762207186714:pla-541454015492&abcId=1139336&m >erchantid=8120224&gclid=Cj0KCQiAt_PuBRDcARIsAMNlBdr9GnvyFwQqV15dYDNLYJa >-MSmhDV7Y65Gp7GAnQkUOOGJ9CgQ9-2gaAn4hEALw_wcB > > Ken
I have come to that same conclusion Ken, but haven't pulled out the card yet. > > Kenneth Lerman > 55 Main Street > Newtown, CT 06470 > > On Sun, Nov 24, 2019 at 9:35 PM Gene Heskett <ghesk...@shentel.net> wrote: > > On Sunday 24 November 2019 20:54:11 Stuart Stevenson wrote: > > > I have used bidirectional compensation on several machines. The > > > latest on a cinci just like the blue one at MPM. It has a Cin950 > > > control. I collected data using a CMM connected to the X table. I > > > put the data in the file, restarted the machine and the machine > > > had twice the error as when I started. I reversed the data in the > > > compensation table and voila the machine looked pretty good. > > > Repeated for Y and Z. Collecting data for 3 dimensional correction > > > may be problematic in some cases. > > > > Nearly impossible in the case of a lathe, which generally has no > > facility other that the stops of a QCTP to set tool height. Which > > is exactly why I treated the sheldons bed wear which has the effect > > of both tilting the carriage and allowing it to sink, as x errors > > only. And it seems to have worked fairly well. > > > > But I'm thinking in terms 3 axis for my G0704 and its crooked post. > > Its either a lot of time scraping, or a 3D COMP but how does one > > actually go about measuring it. Lumberyard squares which everybody > > has a dozen of will never give accurate enough results. likely > > aren't going to be that true to each other. > > > > > thanks > > > Stuart > > > > > > On Sun, Nov 24, 2019 at 7:26 PM Gene Heskett > > > <ghesk...@shentel.net> > > > > wrote: > > > > On Sunday 24 November 2019 19:47:33 Stuart Stevenson wrote: > > > > > 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. > > > > > > > > Ok, but lets pull this magic rabbit back out of the weeds. > > > > Where might I find a good tut on actually putting it to work? > > > > > > > > Thanks Stuart, Gene. > > > > > > > > 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 > > > > Emc-developers@lists.sourceforge.net > > > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > 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 > > Emc-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers 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 Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
