On Tue, 2008-02-12 at 22:42 +0000, [EMAIL PROTECTED] wrote: > > With the experience I have gained so far, it leads me to believe that > > you are making choices that may make your quest more difficult. If you > > are trying to have a CNC machine to make parts and spend as little as > > appropriate for that end, then you should consider studying other > > machines that are already proven to perform and copy their success. > > > > If you want to explore different methods of machine control, be prepared > > to spend allot more time, money and run into dead-ends. You will also > > need to be able to develop your own software because these days, > > hardware won't do anything without software. > > > whoa there, are you telling me EMC can't do PID? > > shirley not..........
Not at all, EMC can do just about anything, if you know how. I may have stated it poorly, I'm just trying to indicate that making linear scales work, in a practical sense, with EMC's motion control, will be uncharted territory. My experience is that, scale feedback and backlash make for an unstable system. No one, that I know of, has been able to get PID to play well with backlash. The PID needs to react differently when in a region of backlash and no-backlash. EMC can do positional backlash compensation, so a solution may be to connect backlash compensation with a dynamic PID system. It's interesting to think about, it just hasn't been done yet. (The cool thing about EMC and Linux is that we are allowed to try. Long live the Penguin.) -- 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
