Same PC, same hardware, same settings. The only difference between the
two setups is the hard drive. Changing the PC (AMD processor VS Intel on
the original) had no effect on the symptoms. I checked latency on the
new PC and if I remember correctly worst case after a couple of hours
was ~150us. Not good for steppers but fine for servos.
I haven't had time to try tracing back from PID. That is probably my
next job.
Les
On 27/06/2017 16:15, Jon Elson wrote:
On 06/27/2017 09:01 AM, Les Newell wrote:
I have been running my lathe using EMC for many years and decided to
upgrade to the latest LinuxCNC. The computer I am using is showing
it's age and the ancient version of Debian I have been running won't
even boot properly on my new computer.
The lathe has a 5i20 and a 7i29 to run the servos. Using the same PID
settings as I had in EMC I get odd random spikes in the Z axis motor
command signal, roughly about one to two a second. If I look at
pid.z.output with halscope I can see the spikes. This is on the same
computer and hardware as I was running EMC, which ran really
smoothly. I changed the computer and the results are the same. I even
used Pncconf to create an absolute minimum spec configuration and it
does the same thing.
I tried both LinuxCNC 2.7.9 and Git head. Does anyone have any ideas
why this would be happening?
Have you run the latency tests? Are the numbers good? Any time you
change the hardware, OR kernel, you need to check that the RT
performance is acceptable.
Jon
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