Re:Backlash Compensation
- Peter_Cassar
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21 Jan 2010 05:36 #1567
by Peter_Cassar
Backlash Compensation was created by Peter_Cassar
Hi, I'm new to EMC2 and I'm impressed with what I see so far. Just joined the forum.
A first question about backlash compensation. Unfortunately my mill has some backlash and I'd like to configure EMC2 to compensate for it. From what I've read you do it in the HAL via the config files. I'm wondering if anyone can share same examples with me and piont me to the precise place to make the configuration settings. I'm not sure how to proceed and what are the HAL commands to set the backlash compensation? Would be nice if backlash compensation and related settings could be done through stepcon.
Do I do this in custom.hal? or somewhere else?
Anyway this is a very professional engineering excercise (EMC2 that is)
Cheers,
Peter.
A first question about backlash compensation. Unfortunately my mill has some backlash and I'd like to configure EMC2 to compensate for it. From what I've read you do it in the HAL via the config files. I'm wondering if anyone can share same examples with me and piont me to the precise place to make the configuration settings. I'm not sure how to proceed and what are the HAL commands to set the backlash compensation? Would be nice if backlash compensation and related settings could be done through stepcon.
Do I do this in custom.hal? or somewhere else?
Anyway this is a very professional engineering excercise (EMC2 that is)
Cheers,
Peter.
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- alex_joni
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21 Jan 2010 08:05 #1569
by alex_joni
Replied by alex_joni on topic Re:Backlash Compensation
It's in your ini file (the config you are running).
You configure for each [AXIS_*] an entry called BACKLASH = amount
www.linuxcnc.org/docview/html/config_ini...b:%5BAXIS%5D-section
Regards,
Alex
You configure for each [AXIS_*] an entry called BACKLASH = amount
www.linuxcnc.org/docview/html/config_ini...b:%5BAXIS%5D-section
Regards,
Alex
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- Peter_Cassar
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21 Jan 2010 08:43 #1572
by Peter_Cassar
Replied by Peter_Cassar on topic Re:Backlash Compensation
Alex, Thanks I see it now. Do I understand correctly that the compensation file is used to specify backlash at various points on the leadscrews?
Cheers,
Peter.
Cheers,
Peter.
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- Rick G
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21 Jan 2010 10:57 #1577
by Rick G
Replied by Rick G on topic Re:Backlash Compensation
Peter,
Look in the Integrator Manual for "BACKLASH" it is applied to the entire axis. Also look at "COMP_FILE" for a compensation structure.
Rick
Look in the Integrator Manual for "BACKLASH" it is applied to the entire axis. Also look at "COMP_FILE" for a compensation structure.
Rick
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- Peter_Cassar
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21 Jan 2010 19:06 #1580
by Peter_Cassar
Replied by Peter_Cassar on topic Re:Backlash Compensation
Thanks Rick,
I've been studying the manual, the compensation file looks quite sophisticated, I've configured simple backlash and will do some analysis on the screws to create a compensation file.
Thanks for all thehelp.
Peter.
I've been studying the manual, the compensation file looks quite sophisticated, I've configured simple backlash and will do some analysis on the screws to create a compensation file.
Thanks for all thehelp.
Peter.
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- sandy
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20 Jul 2010 12:13 #3427
by sandy
Replied by sandy on topic Re:Backlash Compensation
I have been using EMC2for a few months, and find it to be abig improvement over my previous CNC program. However, I need to add 'backlash' to get the accuracy I desire for cutting wooden gears. I have searched the site and all the manuals and have found references to backlash but not how to enter it. MY ".ini' FILE DOES NOT SHOW IT, AND IT IS NOT AN OPTION IN STEPCON.
YOUR RESPONSE TO THE ORIGINAL E-MAIL AND THE REPLY SEEM TO INDICATE THAT BACKLASH SHOULD BE IN MY ".INI" FILE. IS THIS THE CASE AND, IF SO, HOW DO I ADD BACKLASH TO THIS FILE?
I greatly appreciate any guidance you can provide.
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YOUR RESPONSE TO THE ORIGINAL E-MAIL AND THE REPLY SEEM TO INDICATE THAT BACKLASH SHOULD BE IN MY ".INI" FILE. IS THIS THE CASE AND, IF SO, HOW DO I ADD BACKLASH TO THIS FILE?
I greatly appreciate any guidance you can provide.
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- Rick G
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20 Jul 2010 22:36 #3435
by Rick G
Replied by Rick G on topic Re:Backlash Compensation
Hello,
Just edit your .ini file.
If they are not there already add
BACKLASH = x.xxx
(where .xxx ist the amount of BACKLASH) in the .ini files under each axis that you want to add backlash to.
From the manual...
BACKLASH = 0.000
Backlash in machine units. Backlash compensation value can be used to make up for small deficiencies in the hardware used to drive an axis. If backlash is added to an axis and you are using steppers the STEPGEN_MAXACCEL must be increased to 1.5 to 2 times the MAX_ACCELERATION for the axis.
Rick G
Just edit your .ini file.
If they are not there already add
BACKLASH = x.xxx
(where .xxx ist the amount of BACKLASH) in the .ini files under each axis that you want to add backlash to.
From the manual...
BACKLASH = 0.000
Backlash in machine units. Backlash compensation value can be used to make up for small deficiencies in the hardware used to drive an axis. If backlash is added to an axis and you are using steppers the STEPGEN_MAXACCEL must be increased to 1.5 to 2 times the MAX_ACCELERATION for the axis.
Rick G
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- cmorley
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21 Jul 2010 04:24 #3438
by cmorley
Replied by cmorley on topic Re:Backlash Compensation
There are two ways to do compensation.
simple backlash compensation as Rick just described.
Or sophisticated screw compensation. Unfortunately not described in the manual very well.
look here:
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Screw_Compensation
Chris M
simple backlash compensation as Rick just described.
Or sophisticated screw compensation. Unfortunately not described in the manual very well.
look here:
wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Screw_Compensation
Chris M
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- sully0400
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01 Sep 2010 00:35 #3931
by sully0400
Replied by sully0400 on topic Re:Backlash Compensation
i think you just edit it with a text editor
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- ceneca
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17 Sep 2010 01:17 - 17 Sep 2010 20:21 #4221
by ceneca
Replied by ceneca on topic Re:Backlash Compensation
enrique hello, I'm from Argentina, someone can answer in Spanish?, my English is very bad, I fix the backslash and not as editing the file, I am translating with google translator, but his translation is not clear, Please anyone who can help me thank him,
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hola soy enrique, soy de argentina, alguien puede contestarme en espanol?, mi ingles es muy malo, quiero corregir el backslash y no se como editar el archivo, estoy traduciendo , con los traductores de google, pero su traduccion no es clara, por favor cualquiera que pueda ayudarme se lo agradecere,
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gracias
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hola soy enrique, soy de argentina, alguien puede contestarme en espanol?, mi ingles es muy malo, quiero corregir el backslash y no se como editar el archivo, estoy traduciendo , con los traductores de google, pero su traduccion no es clara, por favor cualquiera que pueda ayudarme se lo agradecere,
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
gracias
Last edit: 17 Sep 2010 20:21 by BigJohnT. Reason: remove characters with accent marks
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