OK, great thanks to all. Tonight was a great evening. First I tried to change velocity control loop (tachometer mode) on the bothersome Y amplifier to current (torque) control .
Then things went well very fast and I was able to tune the Y axis near perfectly with FF1 and FF2. The f-error is not within about 0.0002" or so. NO MORE jacking around, no more vibration, Y stops immediately without any buzzing, moves smoothly etc. I was able to up the max acceleration too. Then I went on to Z, which bothered me too as were all axes, just less than Y. Current mode. The trick to get Z working right was to set BIAS, because Z is subject to gravity. Again, under 0.0002" f-error. Both when steadily moving, as well as under acceleration. BIAS, FF1 and FF2 were my big friends. After that, X was the last sweet target. Bye bye tachometer feedback, welcome current loop. After just 2-3 minutes, with better FF1 and FF2 I get f-error under 0.0002". Also increased max acceleration, which will no doubt improve small work performance and truetype-tracer times. I now have a sweet quiet little Bridgeport Interact mill that does not act like it is PMSing 30 days a month. 90 IPM on X and Y (I limited myself to 60 IPM on Z for safety). Quick to home and quiet. That double velocity loop, ad I now realize, was not good for what I was trying to do. Guys, you are AWESOME! Many hugs to all of you from beautiful Lisle, IL! - Igor ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
