On Wed, Sep 15, 2010 at 5:34 PM, Chris Radek <ch...@timeguy.com> wrote:
> 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. > I will try that. > > 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!) > this is the count needed to correct the motion with a 1 inch dial indicator after tuning I will use the laser tracker to do a fine adjust and maybe lead screw comp I have noticed zero backlash in the screws so far thanks Stuart -- dos centavos ------------------------------------------------------------------------------ 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
