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" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> 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 <[email protected]> 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 [email protected] 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
