On Wed, Sep 15, 2010 at 04:08:31PM -0500, Chris Radek wrote: > On Wed, Sep 15, 2010 at 03:32:31PM -0500, Stuart Stevenson wrote: > > Hi, > > I checked the DAC output - it was .889 - I changed the scale from 8.89 to > > .889 - the response was back to just like before. > > The config files to match this picture are available > > The latest picture is; > > http://www.mpm1.com:8080/machines/enshu/Screenshot-1.png
I notice one thing - you've got steady state negative error while stopped before the move, and steady positive error afterward. It looks like you are trying to correct this with I gain. I have found that doesn't work very well in velocity mode. Instead you might try leaving I at zero. If there's steady state error while stopped, try eliminating it with the offset adjustment on the amp. On the prefs tab, put touchy's DRO in feedback mode and in MDI command a move to a round number like G0 X1. Then adjust the offset on the amp until the DRO says 1.0000. In fact if you put touchy's DRO in mm/feedback you'll get three decimal places which will show you precisely every count on your micron-scale encoders and you can set it for 25.400. See if this gives you better results than I gain. It might make your ferror even flatter. Looks like you already have really good results. (why is your scale set weird? the screws can't be off that far can they? that's .002 per inch!) Chris ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
