IR-Probe sometimes not triggered?



  • Hi *,

    I have some problems with my IR-Probe on my CR10 since some days. I hope somebody could help me here...

    Problem: The probe does not get triggered every time. So the head hits the bed because the IR probe do not get triggered. That does not happen every time, mostly when I do a Z-Leveling and than at the first probe on the center of the bed or at the last point at the right site of the bed.
    That does "never" happen when I home Z. So Something in my config must be bad.

    Here some information:
    Duet2 FW 3.1.1
    I replaced the probe with a 2nd one I have.
    Bed surface: Pertinax Picture from a former thread: https://forum.duet3d.com/assets/uploads/files/1592613359195-img_20200620_023459.jpg

    bed.g The "G28" works ~30%, the 2nd G30 failed at ~80%

    G28 ; home
    G30 P0 X20 Y155  Z-99999 ; probe near a leadscrew, half way along Y axis
    G30 P1 X250 Y155Z-99999  S2 ; probe near a leadscrew and calibrate 2 motors
    G1 X150     ; Back to the middle
    

    This should be the relevant part of the config.g

    ; Z-Probe
    M558 P1 C"zprobe.in" H5 F120 T6000
    G31 P500 X-26.0 Y-9.0 Z2.25					
    M557 X10:270 Y40:270 P5:5
    

    Recent changes: I experience some strange behaviors since I migrated to the IR already. Mostly with strange looking head maps: https://forum.duet3d.com/topic/17093/weird-headmap-since-ir-probe
    The today described problem was present at that time already but I do not saw that very often for the focus on the headmap. I replaces the very ugly looking PEI bed surface with the Pertinax plate today. I expected a better behavior of the IR-Probe because the Pertinax is not semi transparent etc. But I was wrong, the behavior did not change at all.

    Any ideas?

    Is there a way to control how fast the head does down when I do the "G30"? It looks very fast to me. Compared the speed the Z goes down at the second probe when I go the G28.

    Cheers, Chriss

    P. s.: I executed "G32" a couple of times while I wrote that. I saw now a lot of "bed crashes" at the "G28" and the two "G30" went very smooth. And I saw one single flash from the led of the IR-Probe while the head was traveling to the center of the bed. :?



  • I'm a bit more confused.

    My macro, to level Z, did a "G32" with the described problems.

    I removed the "G32" from it and copied:

    G30 P0 X20 Y155 Z-99999; probe near a leadscrew, half way along Y axis
    G30 P1 X250 Y155 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
    G1 X150     ; Back to the middle
    

    from the bed.g to the macro file.

    That seems to work now.
    My "bed.g" had the same content plus an extra "G28" at the top of the file. So why?

    Cheers, Chriss



  • @Chriss

    ohhh... I have seen that the rails is at Z0 very, very close to the motor. I think that I need to improve the frame before I can continue. 😞 Sorry...



  • We can close that here.... I have opened a other thread. The behavior is completely different now. 😞


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