Dynomotion

Group: DynoMotion Message: 5395 From: erry321 Date: 7/2/2012
Subject: unexpected coordinated motion buffer underflow issue
Hello Tom

I have run into the "unexpected coordinated motion buffer underflow" problem.
So, this is what happend: I haven't rebooted or turned off computer for a while setting the mill and kflop. I have run a lot of g-code and had no issues at all roa about a month or more.
Two days ago I have shut down the computer and the problem begins. Same code starts giving me "unexpected coordinated motion buffer underflow". I have increased the lookahead time from 3 seconds all way to 30 seconds, no result. If I run same code step by step - no issues, it capable to run one string at the time. Moreover. if it is just simple linear motion - no problems at all, it happens only at complex movements, like this piece of code:

N870 G00 X40. Y40.
N871 S3000 M03
N872 G00 Z-7.5
N873 G01 Z-10.25 F500.
N874 G03 X36.491 Y40. I-1.755 J0. F1000.
N875 G03 X36.491 Y40. I3.509 J0. F1000.
N876 G03 X47.019 Y40. I5.264 J0. F1000.
N877 G03 X47.019 Y40. I-7.019 J0. F1000.
N878 G03 X40. Y40. I-3.509 J0. F1000.
N879 G01 Z-13. F500.
N880 G03 X36.491 Y40. I-1.755 J0. F1000.
N881 G03 X36.491 Y40. I3.509 J0. F1000.
N882 G03 X47.019 Y40. I5.264 J0. F1000.
N883 G03 X47.019 Y40. I-7.019 J0. F1000.
N884 G03 X40. Y40. I-3.509 J0. F1000.
N885 G00 Z20.

The only thing different on the machine: I have readjusted the gibs and nut preload tp get rid of the backlash. But, as I said before, no problems with linear motion up to 2000mm/min and it is capable to do it step by step.

Any thoughts?

Best regards,
Alexey
Group: DynoMotion Message: 5397 From: TK Date: 7/2/2012
Subject: Re: unexpected coordinated motion buffer underflow issue
Hi Alexey,

What version of KMotion are you running?  Are you using KMotionCNC or Mach3?   Run KMotion.exe at the same time and see if any errors are displayed on the Console Screen. 

Regards

TK

On Jul 2, 2012, at 9:39 AM, "erry321" <erry321@...> wrote:

 

Hello Tom

I have run into the "unexpected coordinated motion buffer underflow" problem.
So, this is what happend: I haven't rebooted or turned off computer for a while setting the mill and kflop. I have run a lot of g-code and had no issues at all roa about a month or more.
Two days ago I have shut down the computer and the problem begins. Same code starts giving me "unexpected coordinated motion buffer underflow". I have increased the lookahead time from 3 seconds all way to 30 seconds, no result. If I run same code step by step - no issues, it capable to run one string at the time. Moreover. if it is just simple linear motion - no problems at all, it happens only at complex movements, like this piece of code:

N870 G00 X40. Y40.
N871 S3000 M03
N872 G00 Z-7.5
N873 G01 Z-10.25 F500.
N874 G03 X36.491 Y40. I-1.755 J0. F1000.
N875 G03 X36.491 Y40. I3.509 J0. F1000.
N876 G03 X47.019 Y40. I5.264 J0. F1000.
N877 G03 X47.019 Y40. I-7.019 J0. F1000.
N878 G03 X40. Y40. I-3.509 J0. F1000.
N879 G01 Z-13. F500.
N880 G03 X36.491 Y40. I-1.755 J0. F1000.
N881 G03 X36.491 Y40. I3.509 J0. F1000.
N882 G03 X47.019 Y40. I5.264 J0. F1000.
N883 G03 X47.019 Y40. I-7.019 J0. F1000.
N884 G03 X40. Y40. I-3.509 J0. F1000.
N885 G00 Z20.

The only thing different on the machine: I have readjusted the gibs and nut preload tp get rid of the backlash. But, as I said before, no problems with linear motion up to 2000mm/min and it is capable to do it step by step.

Any thoughts?

Best regards,
Alexey
Group: DynoMotion Message: 5399 From: Albert Date: 7/2/2012
Subject: Re: unexpected coordinated motion buffer underflow issue
Hi Alexey,
Do you use USB 2.0 port or USB 3.0 ?
A lot of new mainboards have not native support 
USB 3.0 ports, they are actually kinda software emulated, and work very slow on KFlop.
I had simillar issue on my new pc.
If you have free USB 2.0 port try it.
 
Best Regards
Albert Platek

Wysłane z iPhone'a

Dnia 2012-07-02 o godz. 18:55 TK <tk@...> napisał(a):

 

Hi Alexey,

What version of KMotion are you running?  Are you using KMotionCNC or Mach3?   Run KMotion.exe at the same time and see if any errors are displayed on the Console Screen. 

Regards

TK

On Jul 2, 2012, at 9:39 AM, "erry321" <erry321@...> wrote:

 

Hello Tom

I have run into the "unexpected coordinated motion buffer underflow" problem.
So, this is what happend: I haven't rebooted or turned off computer for a while setting the mill and kflop. I have run a lot of g-code and had no issues at all roa about a month or more.
Two days ago I have shut down the computer and the problem begins. Same code starts giving me "unexpected coordinated motion buffer underflow". I have increased the lookahead time from 3 seconds all way to 30 seconds, no result. If I run same code step by step - no issues, it capable to run one string at the time. Moreover. if it is just simple linear motion - no problems at all, it happens only at complex movements, like this piece of code:

N870 G00 X40. Y40.
N871 S3000 M03
N872 G00 Z-7.5
N873 G01 Z-10.25 F500.
N874 G03 X36.491 Y40. I-1.755 J0. F1000.
N875 G03 X36.491 Y40. I3.509 J0. F1000.
N876 G03 X47.019 Y40. I5.264 J0. F1000.
N877 G03 X47.019 Y40. I-7.019 J0. F1000.
N878 G03 X40. Y40. I-3.509 J0. F1000.
N879 G01 Z-13. F500.
N880 G03 X36.491 Y40. I-1.755 J0. F1000.
N881 G03 X36.491 Y40. I3.509 J0. F1000.
N882 G03 X47.019 Y40. I5.264 J0. F1000.
N883 G03 X47.019 Y40. I-7.019 J0. F1000.
N884 G03 X40. Y40. I-3.509 J0. F1000.
N885 G00 Z20.

The only thing different on the machine: I have readjusted the gibs and nut preload tp get rid of the backlash. But, as I said before, no problems with linear motion up to 2000mm/min and it is capable to do it step by step.

Any thoughts?

Best regards,
Alexey
Group: DynoMotion Message: 5400 From: Alexey Volkov Date: 7/2/2012
Subject: Re: unexpected coordinated motion buffer underflow issue
Hello guys

Looks like the problem can be connected to recent mill adjustment:
It is possible I screwed up with the mill and the y axes can not keep up with the acceleration. If I got it right, disabled axis can cause such the message.
I can see what the Y axis is disabled every time it happens.
I use USB 2 and KmotionCNC.

Best regards,
Alexey

Sent from my iPhone

On 2012-07-02, at 9:55 AM, TK <tk@...> wrote:

 

Hi Alexey,

What version of KMotion are you running?  Are you using KMotionCNC or Mach3?   Run KMotion.exe at the same time and see if any errors are displayed on the Console Screen. 

Regards

TK

On Jul 2, 2012, at 9:39 AM, "erry321" <erry321@...> wrote:

 

Hello Tom

I have run into the "unexpected coordinated motion buffer underflow" problem.
So, this is what happend: I haven't rebooted or turned off computer for a while setting the mill and kflop. I have run a lot of g-code and had no issues at all roa about a month or more.
Two days ago I have shut down the computer and the problem begins. Same code starts giving me "unexpected coordinated motion buffer underflow". I have increased the lookahead time from 3 seconds all way to 30 seconds, no result. If I run same code step by step - no issues, it capable to run one string at the time. Moreover. if it is just simple linear motion - no problems at all, it happens only at complex movements, like this piece of code:

N870 G00 X40. Y40.
N871 S3000 M03
N872 G00 Z-7.5
N873 G01 Z-10.25 F500.
N874 G03 X36.491 Y40. I-1.755 J0. F1000.
N875 G03 X36.491 Y40. I3.509 J0. F1000.
N876 G03 X47.019 Y40. I5.264 J0. F1000.
N877 G03 X47.019 Y40. I-7.019 J0. F1000.
N878 G03 X40. Y40. I-3.509 J0. F1000.
N879 G01 Z-13. F500.
N880 G03 X36.491 Y40. I-1.755 J0. F1000.
N881 G03 X36.491 Y40. I3.509 J0. F1000.
N882 G03 X47.019 Y40. I5.264 J0. F1000.
N883 G03 X47.019 Y40. I-7.019 J0. F1000.
N884 G03 X40. Y40. I-3.509 J0. F1000.
N885 G00 Z20.

The only thing different on the machine: I have readjusted the gibs and nut preload tp get rid of the backlash. But, as I said before, no problems with linear motion up to 2000mm/min and it is capable to do it step by step.

Any thoughts?

Best regards,
Alexey
Group: DynoMotion Message: 5409 From: Tom Kerekes Date: 7/2/2012
Subject: Re: unexpected coordinated motion buffer underflow issue
Hi Alexey,
 
Sorry about the confusing error message.
 
Regards
TK