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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