On Tue, 27 Jun 2017, Les Newell wrote:
Date: Tue, 27 Jun 2017 15:01:34 +0100
From: Les Newell <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] Rough motion with servos
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?
Les
Can you trace the PID output spike back to its source?
Maybe there's a encoder noise issue or something similar
(that may have changed signtly with a new PC due to grounding differences etc)
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Peter Wallace
Mesa Electronics
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