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

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?

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....

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