On Sun, Oct 10, 2010 at 1:05 PM, Jon Elson <[email protected]> wrote:
> Stuart Stevenson wrote: > >> For the XY and Z axes we pigtailed the connector so EMC2 gets the same > >> > > signal the drive gets. At the same time and rate. > > > Wow, that is really weird! > the motor has an encoder so we built a splitter cable and routed the encoder feedback to EMC2 and the drive. > > For the spindle we used the encoder pulse out of the spindle drive as the > > spindle motor feedback is two sine waves. > > Friction sounds logical for the start of the accel but not for the start > of > > the decel. I get the same distortion in both places. > Yeah, I saw it. actually, there are 4 disturbances, at the jerk > inflection points. What acceleration > do you have it set for? > I see the disturbance in two places when I have the accel as low as 2. The accel is set to 50 in the example. > > If you notice the trace > > is squared at the beginning of the accel and the beginning of the decel. > > > What trace is this, the error trace? Yes, I see it. it must mean that > the drive is slow in acknowledging > sudden changes in acceleration. Anyway, it is clear your tuning is far > off, as the errors are huge > even during the cruise portion. There is also a similar disturbance at > the end of the accel, so all 4 > jerk locations show this disturbance. > > I would like to feed an EMC2 generated proportional pulse (psuedo > encoder) > > to the velocity feedback of the drive to see if that would not eliminate > the > > drives tuning and let EMC2 handle closing the loop. > > > Hmmm, I don't know how you'd do that. The PPMC board set doesn't have a > quadrature output. > I suppose you could use a USC board set for quadrature output. > > Jon > > > ------------------------------------------------------------------------------ > Beautiful is writing same markup. Internet Explorer 9 supports > standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. > Spend less time writing and rewriting code and more time creating great > experiences on the web. Be a part of the beta today. > http://p.sf.net/sfu/beautyoftheweb > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
