On 17 October 2011 13:40, Tom Easterday <tom-...@bgp.nu> wrote: > We have tried many combinations of max_acceleration and max_velocity for both > EMC (TRAJ section) and in the Axis (Y in our case) we are jogging. The last > settings we were using are pastebin'd below - but keep in mind we have tried > a wide range of values.
One thing I notice is that you only have one setting for MAX_ACCELERATION in the INI file, this is shared between the motion planner and the stepgen. This could be the problem. Normally a stepper-based configuration will use a STEPGEN_MAX_ACCELERATION (or similar) tag to give the stepgen a bit of extra headroom over the trajectory controller. All your INI file changes have been changing both values at the same time. It is worth clarifying what "following error" means in the case of a stepper system, without feedback. What is indicates is the difference between the number of step pulses that have been requested relative to the number that have been output. The normal cause of a disparity in a parallel port system is that the base thread isn't quick enough to actually make the pulses. In a Mesa system this is unlikely to ever happen. However, you also see a problem if there isn't any daylight between the motion controller limits and the stepgen limits. Can I suggest you hand-edit the values in lines 247 and 248 of you HAL file? (Or, alternatively, add a new tag to the INI file stanza and use that) Do you actually see the overshoot-and-return in Halscope without the drive attached, or just the f-error? -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ 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-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
