'Following error' as X axis travels to home offset subsequent to homing

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06 Jul 2023 15:23 #274893 by kenthompson
I researched this issue on google + these forums and cant seem to find a solution.

My X axis has been homing without issue until today.  Now, homing completes and then triggers a 'following error' within 100mm of travel to go to the home offset.  Movements of the X axis using the jogging commands + the setup utility work without issue at speeds up to 350+ mm/s.  However, when I set my config ini to have an X max velocity in excess of 150mm/s, the following error triggers.  My work around has been to set the home offset to near of the limit switch so no travel occurs after homing completes.  

What am I missing here? This was working without issue until today- super perplexed.  Attaching HAL and INI.  Thank you!
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06 Jul 2023 16:06 #274896 by tommylight
Missing
HOME_FINAL_VELOCITY = nn <number here
But that should not be the only cause as setting it to 0 is the same as not having it, meaning the machine will travel at max speed for the final part of homing.
Seems you have a metric machine, so FERROR = 1 and MIN_FERROR = .25 are to small, should be 10 and 1. This might just be enough to stop it having the issue.
But first, do you get latency warnings when using LinuxCNC?

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06 Jul 2023 16:09 #274897 by PCW
That's weird, maybe something changed on the host computer to increase latency

Maybe a plot of the following error (and say joint 0 velocity) would provide a clue

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06 Jul 2023 16:45 #274900 by kenthompson
Thanks - I will try increasing FERROR as I am running in metric and report back ASAP.  No latency warnings in linuxcnc. Just re-ran latency tester with a bunch of glxgears + youtube videos running.  I am holding at a solid sub 3K as shown below

 

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06 Jul 2023 16:52 #274901 by kenthompson
Changed FERROR to 10 and MIN_FERROR to 1- still getting follow error. I also added HOME_FINAL_VELOCITY = 150 to the ini. This also did not fix the issue. Not sure what to do

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06 Jul 2023 17:02 #274902 by kenthompson
Using the hal scope? I'm a newbie with that scope- do you have a link to the setup so I can plot it?

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