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seuchato wrote:

Hi all
After a couple of years, I am finally back and ready to making chips. I have a router, use steppers on parport. Linuxcnc is 2.9.4, debian doodle jump :

Linux cnc0 6.1.0-35-rt-amd64 #1 SMP PREEMPT_RT Debian 6.1.137-1 (2025-05-07) x86_64 GNU/Linux

The router works, I can cut stuff etc. not the problem. The job that I want to do soon requires quite a few tool changes. So far I did it using the dowel method, but that is very time consuming. Sure an automatic tool changer would be perfect, but that's up for in a later stage. For now I have a tool length sensor, that I would like to use with my collet spindle to get tool length set after a manual tool change.

When I run tcdemo.ngc:

- goes to change position
- when I hit "Tool change complete", goes to zmax, tool sensor x and y, starts going towards the sensor.
- As soon as the sensor is touched, I get "Probe tripped during non-probe move" and program is stopped

How can I get over this?

I attach the relevant files in zipped folder "toollength_problem.zip"

Greez
chris
You might want to double-check that the

G38.x command is active before motion toward the sensor begins. Also, review your HAL and INI files to confirm the probe input isn't being tripped by noise or an early signal. Did you try adding a small delay before the probe move to stabilize the signal?

Aciera wrote:

Maybe have a look at the 'joint.N.unlock' pins:
linuxcnc.org/docs/html/man/man9/motion.9...OINT%20unlock%20pins