On 04/14/2015 05:46 PM, andy pugh wrote: > On 14 April 2015 at 23:26, TJoseph Powderly <tjt...@gmail.com> wrote: >> yes, seems true. >> i hope your view of the time sale for reversals is >> at most millisecs. the immediate velocity has nothing to do with the >> previous, there is no velocity smoothing. > > I remain confused by this. > If adaptive feed went from +1 on one servo cycle to -1 on the next > servo cycle I would expect the axis acceleration constraints to be > obeyed, as to do otherwise surely risks following errors? > > Are you saying that wire EDM machines ignore the axis acceleration > limits and just hope for the best? > im confused too do you mean 1 smallest unit of motion where acc doesnt really mean much anyway (eg acceleration when moving 1 micron ) and the system was not moving at any feedrate to speak of already.
if the position change were 1mm id not think it meant much jerk and if 1 inch ok too big a jerk and neither 1mm nor 1inch is achieved by any edm i've seen inside a single servo cycle ( say 40mS ) humorous sidenote: there is an app note from heidenhain where the engr complained it ignored acc limits. so it does happen he was not replied to, even funnier i'd say the position change requested in 1 servo cycle is tiny and the change in velocity achievable in 1 servo time slot is tiny oh and yes they do monitor following error based on acc and velocity and present position (Aktual) vs requested (Kommand) but thats just one implementation oh and i dont speak much of wedm the edm process is the same the imp[lementation is different. still would never move more than a few microns in an servo period. my 2c tomp tjtr33 ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
