X/Y Axis Jump While Moving Z-Axis Full Extent

  • High all,

    Odd behaviour that I thought was my three lead screws arguing against each other but it appears otherwise.

    If my carriage on my core x-y is in the 0, max-y position and I move the z axis all the way up or down part way through the move the carriage will jump. Any idea what could be causing this? Bed correction? Will try to see if it is repeatable and do it with and without bed correction after this build.

    Firmware Name: RepRapFirmware for Duet 2 WiFi/Ethernet
    Firmware Electronics: Duet Ethernet 1.02 or later + DueX5
    Firmware Version: 2.0(RTOS)RC1 (2018-05-02b1)
    Web Interface Version: 1.21.1-RC1

    Will update to latest RC before further tests. Occasionally get a bit of a bang/jump during the homing routines too.

  • administrators

    That's a very strange fault. Unless you have axis skew compensation enabled (M556 command in config.g) then the X and Y axes should be completely independent of the Z axis. The only explanation I can see for the problem you describe is a power issue. If the power voltage drops below approx. 10V then the motor drivers will reset when the power comes up again, and this may cause a jump because the motors will jump to the nearest position that matches the default driver microstep position.

  • Thanks for the pointers. I'll go through the checks tomorrow after my build. Should be able to see the low volts event it that is what triggers it.

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