On Mon, 19 Sep 2011 23:02:08 +0300, you wrote: >Thinking about decreasing stepper (and servo, to some extent) torque at >higher speeds, I just thought that having variable axis acceleration would >be perfect. I.e., the highest at lower speeds and lower at higher speeds. Is >that ever possible with EMC2? If no, is it hard to implement?
Is that really desirable, or even needed? Surely the ideal is a constant linear acceleration and deceleration? Some rounding of the acceleration curve at the start/end to counteract jerk "may" be required, the jury's out on that one. Accelerating steppers very quickly through the resonant point is desirable, unfortunately there is no fixed resonant point, it depends on the installation, load and voltage. There's lots of work been done on stepper acceleration profiles, a google search will find dozens of examples, but the majority aim for as close to a linear profile as possible. The complication comes when more than one axis is involved and they are moving different distances ;) Steve Blackmore -- ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
