How did you buy the screw? Via Hiwin directly or through a distributor ??
I think you are near Cleveland ? Did you get a price from Nook as well ?? Nook is right in Cleveland on 49th street. Dave On 6/29/2016 8:35 AM, Todd Zuercher wrote: > I don't know how much use it is to you, but I bought a custom ball screw (cut > to length and ends machined to my specs) from Hiwin, for significantly less > (about half) of what the cost of buying an OE lead screw (not ball screw) > from the manufacturer of one of our machines. It works better and has lasted > more than twice as long as the original lead screws (which used to last only > about 2 years). > > ----- Original Message ----- > From: "Dave Cole" <linuxcncro...@gmail.com> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Tuesday, June 28, 2016 4:42:00 PM > Subject: Re: [Emc-users] Screw compensation file - LinuxCNC 2.6 > > I thought about that except that the data file is setup via the same > method as the Y axis. > > However the X axis screw is much worse than the Y axis. > > I went over the file with the guy who did the measuring, and he agreed > that the data seems like it is in the proper order. > > Its weird that the Y axis is working really well, while the X axis is > not working well at all. I have a small X-Y machine in my office that I > may setup with a dial indicator and do some testing just so I can better > understand the screw comp. > > I did some looking and Nook, a big ball screw maker in the US says that > their rolled ball screws, which are not normally used for machine tools > are accurate to +/- .004 per foot. In the first foot of this X axis > screw, the screw is out 0.030 of an inch. > > Nook's ground ball screws, standard accuracy are good to +/- 0.001 per > foot. > > So I wonder if I have reached the limit of LinuxCNCs ability to > compensate for a junk screw? > > Dave > > On 6/28/2016 11:56 AM, andy pugh wrote: >> On 28 June 2016 at 15:35, Dave Cole <linuxcncro...@gmail.com> wrote: >> >>> LinuxCNC is trying to use the x axis data since ball bar testing >>> results change significantly if the X axis screw comp is enabled or >>> disabled. However the screw comp is not effectively correcting the >>> screw. >> Is it possible that the compensation file is upside down? >> > ------------------------------------------------------------------------------ > Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San > Francisco, CA to explore cutting-edge tech and listen to tech luminaries > present their vision of the future. This family event has something for > everyone, including kids. Get more information and register today. > http://sdm.link/attshape > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San > Francisco, CA to explore cutting-edge tech and listen to tech luminaries > present their vision of the future. This family event has something for > everyone, including kids. Get more information and register today. > http://sdm.link/attshape > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
