Homing Z axis - wrong direction :(

  • hi guys 🙂
    i would appreciate if you could please help me with a minor problem
    on my corexy printer - while homing the bed it keeps going down instead of going up.
    when i press the +5 Jog button it goes up and for -5 the bed goes down (is it ok?)
    right now i am tring to setup my bl-touch sensor and when i try to use G30 command
    the bed goes down instead of up. also when i try home Z and home all - the also bed goes down.
    btw, at the reprap configuratore chose for z axis backward is it ok?

    ; Drives
    M569 P0 S1                                         ; Drive 0 goes forwards
    M569 P1 S1                                         ; Drive 1 goes forwards
    M569 P2 S0                                         ; Drive 2 goes backwards
    M569 P3 S0                                         ; Drive 3 goes backwards!
    ; homez.g
    ; called to home the Z axis
    G91                 ; relative positioning
    G1 Z5 F6000 S2      ; lift Z relative to current position
    G90                 ; absolute positioning
    G1 X-13.5 Y20 F6000 ; go to first probe point
    G30                 ; home Z by probing the bed
    ; Uncomment the following lines to lift Z after probing
    ;G91                ; relative positioning
    ;G1 S2 Z5 F100      ; lift Z relative to current position
    ;G90                ; absolute positioning

  • @jaysson_ch The simple thing to try is to reverse the motor direction. Assuming P0 is X, P1 is Y and P2 is Z, change P2 from S0 to S1.

    The cofigurator can only make a guess as to which way a motor turns and which direction means up or down.

  • I am also pretty sure you need to reverse z motor

  • administrators

    @jaysson_ch Also its important to remember that +5 should make the bed move away from the nozzle, increasing the Z distance by 5mm. Similarly a -5 jog should make it move towards the nozzle. So if you have a setup where the Z axis moves the bed, not the gantry with the XY motion system on it +5 should make the bed move down by 5mm.

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