Kirk Wallace wrote: > After looking at the graph for a while, it came to me that the slope of > the Z0 to Z2 move intersects the vertex of the Z2 to Z0 move and the > G4p0.2 dwell. Shown as line "A" my revised graph here: > > http://www.wallacecompany.com/cnc_lathe/HNC/emc2/spindle_sync_surge-1b.png > > Shouldn't the target slope have been line "B"?
Lines A and B are separated by about 1/3 of a second. If your spindle speed is roughly 180 RPM, then they are separated by one turn of the spindle. EMC decides which turn is best to sync to. In this specific case, it actually stops the Z axis for a moment. This makes me believe that it has determined it would have required excessive acceleration to sync up to rev A-1, and decided to wait for rev A. Rev B would have required even greater wait time, so it was not even looked at as a choice, since rev A could be achieved. This is what I read from your plot. I assume many times there would be a smaller wobble in velocity, since this particular snapshot may be one of the worst-case situations. Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
