On Sun, 8 Sep 2019, andy pugh wrote:
Date: Sun, 8 Sep 2019 10:50:54 +0100
From: andy pugh <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] Step timing and max velocity
On Sun, 8 Sep 2019 at 04:41, andrew beck <[email protected]> wrote:
I can move the table at max speed but the Stepgen PID errors out.
Can you elaborate on this?
PID has no error messages, as far as I know. So what is the actual error?
What is PID.n.maxerror set to?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I almost guarantee this is the issue, Some earlier versions of pncconf set this
to .0005 as a way to make the stepgen more robust with regard to host servo
thread jitter but the number only makes sense in inches so fails on metric
machines. This should be set so say .0127 on metric machines (or just 0) to
disable the correction limit completely.
Other values:
FF1 = 1.0
P= 1/servo period (so normally 1000)
and if you are very fussy:
FF2 = seconds from position read to velocity write
about 0.0001 on Ethernet cards
Is your FF1 correct? In a cruise, using
halscope, you should see the
velocity command and the actual velocity pretty much equal.
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
?? George Fitch, Atlanta Constitution Newspaper, 1916
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Peter Wallace
Mesa Electronics
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