Jon,
I am using the coordinate systems as a means of getting multiple tools
offset in X and Y from each other so they can land on top of each other.
IOW, do a pass with one tool, then apply the offsets of another tool but
otherwise follow the same tool path. For example:
G54 - Null Tool
G55 - Basically a Stylus (no tangential axis)
G56 - Tangential tool #1
G57 - Tangential tool #2
There are also home, sharpen and out of the way positions which are
absolute, and these are the positions using machine coordinates, i.e. using
commands of the form
G53 G0 X0 Y0
or
G54 G0 X0 Y0
Also the initial start point is generally set with machine absolute
positions, so as not to be confused by the tool offset in effect. When the
pattern is run, a G92 X0 Y0 is issued prior to a G54-G57, and even if the
current location is absolute machine 0.
I can understand the offsets (G54-57) getting cleared, etc. on a stop, but I
do not understand why I cannot re-establish them with another G10 L2 ...
Additionally, I am running a headless system with my own user interface, so
I am not using Axis. The section of the manual you reference is exactly what
I was working from.
Thanks,
Eric
Why are you working in the machine coordinate system? I never do that, it
is for LinuxCNC to know what the machine limits of travel are. I use the
Axis touchoff button to set coords.
There are what I consider to be quirks in the way LinuxCNC treats the
workpiece coord systems, but if you use touchoff instead of G92 L2 Px then
Axis handles these quirks. Otherwise, when a program is aborted or ends,
the G92 L2 Px offsets are cleared. Axis resets these offsets as soon as
LinuxCNC clears them, so you are unaware of this behavior. To my thinking,
when I set a workpiece offset, I expect it to STAY set until I change it
explicitly. There is a command that restores the cleared offsets, G92.3.
You should read the user manual, around page 86 in :
http://linuxcnc.org/docs/LinuxCNC_User_Manual.pdf
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