Min Ferror & Ferror

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28 Jul 2017 17:28 - 28 Jul 2017 17:32 #96621 by massimodamassa
massimodamassa created the topic: Min Ferror & Ferror
Hello to everyone, I'm configuring the lathe with mesa 5i22-1 in step / dir mode and I noticed that running the G76 failed me tracking axes.
I solved by raising the values to min.ferror 1 and ferror 5.
Now thread 1000 rounds 10 without blocking.
I was wondering: being open-loop on the emc side, does the ferror value make sense?
I do not think so, so I could even raise him 5min and 25th, what do you say?

I forgot that they are in G21 mm mode

my lathe


A thank you to BillyKid and Andypugh
Last Edit: 28 Jul 2017 17:32 by massimodamassa.
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28 Jul 2017 23:40 #96634 by PCW
PCW replied the topic: Min Ferror & Ferror
if you get a (large) following error on a open loop step/dir system it means the step generator
is not following the commanded position well.

This can be because of insufficient acceleration or velocity headroom
(stepgen limits should be about 25% greater than machine limits)
or tuning if the stepgen is PID controlled

Can you post your hal/ini files?
The following user(s) said Thank You: massimodamassa
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29 Jul 2017 06:56 - 29 Jul 2017 07:04 #96639 by massimodamassa
massimodamassa replied the topic: Min Ferror & Ferror
Here are the files in the machine.
Thank you
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Last Edit: 29 Jul 2017 07:04 by massimodamassa.
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29 Jul 2017 15:20 #96648 by PCW
PCW replied the topic: Min Ferror & Ferror
try replacing all the (per axis)

setp pid.N.maxerror .0005

statements with

setp pid.N.maxerror 0

(where N is the axis)
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29 Jul 2017 15:24 - 29 Jul 2017 15:35 #96649 by massimodamassa
massimodamassa replied the topic: Min Ferror & Ferror
And in the ini file, delete the min ferror and ferror rows?

But if imposed 0 does not become more critical?

Is it not better to put false in place of true?
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Last Edit: 29 Jul 2017 15:35 by massimodamassa.
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29 Jul 2017 15:57 #96651 by PCW
PCW replied the topic: Min Ferror & Ferror
You should be able to set the ferror and min ferror much smaller (say .01 mm and .005 mm)
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30 Jul 2017 10:20 #96675 by massimodamassa
massimodamassa replied the topic: Min Ferror & Ferror
I do not understand the position control utility when controlling it drives.

Where do I not understand?
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