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G92 disable persistence

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2 years 8 months ago #294178 by An
G92 disable persistence was created by An
Hi everyone, 

Wondering what behaviour I could expect in axis when disable g 92 persistence is active? Would you expect to see the g92 axis value return to 0.00 when an m2 or m30 is encountered? Version 2.8.4

thanks
ant

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2 years 8 months ago #294183 by Aciera
Replied by Aciera on topic G92 disable persistence
'G92 persistence' refers to Config-Startup, M2/M30 will not affect G92 offset values/state.

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2 years 8 months ago #294185 by Aciera
Replied by Aciera on topic G92 disable persistence
Note, there are some bugs regarding 'G92' in the 'Active GCodes' list:
github.com/LinuxCNC/linuxcnc/issues/2743

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2 years 8 months ago - 2 years 8 months ago #294235 by An
Replied by An on topic G92 disable persistence
Thanks for the reply Aciera. The reason I was asking re the program end was this (from 2.8 manual) - ‘Programmers that wish for Fanuc behavior, where G92 offsets are cleared at machine start and after a reset or program end, may disable G92 persistence by setting DISABLE_G92_PERSISTENCE
= 1 in the [RS274NGC] section of the .ini file. the 2.8 user manual ‘
Last edit: 2 years 8 months ago by An. Reason: Clarity

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2 years 8 months ago #294357 by Aciera
Replied by Aciera on topic G92 disable persistence
Indeed, this is still in the current documentation for 2.9.x:
linuxcnc.org/docs/html/gcode/coordinates...ha:coordinate-system

However it does not seem to reflect the behavior observed, but I have not tested versions before 2.9. I somewhat doubt that it worked in 2.8.

Also beware of this bug:
github.com/LinuxCNC/linuxcnc/issues/2908
The following user(s) said Thank You: An

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2 years 8 months ago #294359 by Mecanix
Replied by Mecanix on topic G92 disable persistence
Regardless whether it works, buggy or not, you have access to a sub and given full control for most machine state behaviors (G10 offsets incl). Much safer and easier to keep track of what's what and who's doing what that way. 

1. Create a file in your nc subroutines folder named "on_abort.ngc"
2. in your *.INI file, amend the RS274NGC section. 

INI file 
Code:
[RS274NGC] SUBROUTINE_PATH = path_to_your/nc_subroutines ON_ABORT_COMMAND = o <on_abort> call


on_abort.ngc example
Code:
o<on_abort> sub     G59 (Bug fix. See: https://github.com/LinuxCNC/linuxcnc/issues/2745)     G54 (origin offsets are set to the default)     G18 (select XY plane)     G90 (absolute)     G94 (feed mode: units/minute)     M48 (set feed and speed overrides)     G40 (cutter compensation off)     M5  (spindle off)     G80 (cancel modal motion)     M9  (mist and coolant off)     o100 if [#1 eq 5]         (machine on)     o100 elseif [#1 eq 6]         (machine off)     o100 elseif [#1 eq 7]         (estopped)     o100 elseif [#1 eq 8]         (msg, abort pressed)     o100 else         (DEBUG, [on_abort.ngc] error parameter is [%d#1])     o100 endif o<on_abort> endsub m2
 

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