On Sun, 2008-01-27 at 09:53 -0500, Stan Blosser wrote: > Dredging up a slightly old thread, but rather than start a new one... > > I'm in the design/planning stages of CNCing a Sieg X3 mill and will be > using ball screws. At this point, I am planning to use Nook XPR > screws as they have a lead error of .001 in/ft. The main reason being > is that I do not have an accurate method (that I know of) to map a > less accurate screw for error compensation in EMC2. If I did, I would > likely be looking at Roton screws at .004 in/ft error. Regardless of > the screws, I'll be using double nuts to adjust out the backlash. > > Does anyone know of a "home shop" class method to map a screw? > Perhaps using a dial indicator and moving along an inch at a time. > That sounds a bit tedious and prone to mistakes, but it's the only > thing I can come up with off the top of my head. > > Also, I'm assuming EMC2's screw compensation interpolates between data > points in the compensation file. Can anyone confirm this? If so, is > it just a simple linear interpolation? > > Thanks, > Stan
The only ideas I have come up with so far are, to use gauge blocks which could get expensive in a hurry, and maybe laser interferometry like here: http://www.renishaw.com/en/6594.aspx#tocTarget0 I wonder if there is a DIY version of this? Maybe you could make your own gauge blocks or a notched bar of approximate size and have them measured accurately by a measuring service. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
