Lost steps during programm

Hi,

I recently have the issue, that my CNC loses steps (sometimes quite frequently, every few seconds) only on the X Axis. This only happens when I am running a Gcode file. While manually jogging and homing, everything works fine. I've checked the mechanics, and everythings seems to run smoothly.
Since the beginning of using LinuxCNC I always get the error "Unexpected realtime delay in task 0 with period 100000. This Message will only display ince per session. Run the latency Test and resolve before continuing" on startup. I did the latency test before first configuring in stepconf Wizard and got results between 35000-50000ns for the Base Thread while doing several resets and tring whit different other softwares running. I know this isn't perfect, but for over a year this worked just fine. Now randomly the machine started losing steps, but the jitter is still the same.
I am pretty sure this has to be a software issue, but I don't really know what I could try to fix it. I hope you have some ideas.

Thanks for your help,
Max

my issues in the past for missing steps

steper motor drive settings
coupling slippage( is not realy missing steps)
step time, and space settings
acceleration and speed setings

Philip





 

Another possibility, especially if you are only loosing steps when running a program but not when jogging. If your power-supply for the steppers is borderline adequate the resulting voltage drop when moving multiple motors during a program can cause missed steps that won't happen when jogging just one.