engraving depth setting in realtime

thanks - I think halmodule is what I want

OK - it works.
thats nice... thank you.

Now it would be fine to start the script at startup of linuxCNC.
I tried
[PYTHON]
TOPLEVEL = /opt/emc2-dev/pytest.py


but it results in
...cant instantiate Python plugin....

the script is simple:

#!/usr/bin/python
import hal, time, serial

h = hal.component("passthrough")
h.newpin("in", hal.HAL_FLOAT, hal.HAL_IN)
h.newpin("Zdist", hal.HAL_FLOAT, hal.HAL_OUT)
h.ready()
f=1;

ser = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)

try:
while 1:
s = ser.readline()
s=s[1]+s[2]+s[3]+s[4]
snum=float(s)/50
snum=int(snum)
print snum
f=f+1;
time.sleep(1)
h = snum;

except KeyboardInterrupt:
ser.close()
raise SystemExit

wicki wrote: Now it would be fine to start the script at startup of linuxCNC.
I tried
[PYTHON]
TOPLEVEL = /opt/emc2-dev/pytest.py

That syntax is for re-mapping G-code commands.

Loading your new module is actually rather easier than that. just add to the HAL file.

You probably want to change the component name, and the file name and component name need to match. (ie, a file called zadjust.py and h = hal.component("zadjust")

real nice

I just added

HALCMD = loadrt offset
HALCMD = loadusr /opt/emc2-dev/python/zadjust.py

to the -ini-file.

this also works....

The engraving-depth-probe is working now.
But I need some help again.

There is one question remaining:

A python-script sets the fine-position of the z-axis via z-offset when engraving.
But the fine-tuning took some time.
So, if the value of the z-axis reaches the engraving-depth, x/y-axes start to
move, but the fine-setting (by z-offset) is not finished.

What is the right way to pause x/y-move until z-offset-position is reached?

wicki wrote: A python-script sets the fine-position of the z-axis via z-offset when engraving.
But the fine-tuning took some time.
So, if the value of the z-axis reaches the engraving-depth, x/y-axes start to
move, but the fine-setting (by z-offset) is not finished.

This might be a fundamental problem due to the XY moves being handled by the realtime system and the offset happening in a user-space Python module. Or it might not be anything to do with this.

What is the right way to pause x/y-move until z-offset-position is reached?

Have a look at motion.feed-inhibit
linuxcnc.org/docs/2.7/html/man/man9/motion.9.html

Have a look at motion.feed-inhibit
linuxcnc.org/docs/2.7/html/man/man9/motion.9.html

Yes, it works - for all axes at the same time.
But its not possible to stop the movement of only a single axis with
motion.xxx - or I have not found these option....

wicki wrote: Yes, it works - for all axes at the same time.

That shouldn't matter, your Z-offsetting is not happening as an axis move, it is an offset to the motor position.

andypugh wrote: That shouldn't matter, your Z-offsetting is not happening as an axis move, it is an offset to the motor position.

Yes! Thats it.
I had not tried to move z by offset while motion.feed-inhibit is true....

Thank you