Core XY printer. Z homing issues.



  • I'm homing z with a normal limit switch on a core XY machine. When I try to home z from the web interface, it works perfectly. When I home all axis from a gcode file the limit switch gets pressed, then the bet travels further up past the trigger height. Is there something I need to have in my slicer to tell it its a core XY?

    ; Configuration file for Duet WiFi (firmware version 1.17 to 1.19)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Oct 26 2017 22:04:46 GMT-0500 (Central Daylight Time)

    ; General preferences
    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves
    M555 P2 ; Set firmware compatibility to look like Marlin

    M667 S1 ; Select CoreXY mode
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X420 Y430 Z415 S0 ; Set axis maxima

    ; Endstops
    M574 S0 ; Define active low and unused microswitches
    M574 X1 Y1 Z1 S1 ; Define active high microswitches
    ;M558 P0 X0 Y0 Z1 H5 F120 T6000 ; Set Z probe type to switch, the axes for which it is used and the probe + travel speeds
    ;G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
    M557 X15:445 Y15:445 S20 ; Define mesh grid

    ; Drives
    M569 P0 S0 ; Drive 0 goes forwards
    M569 P1 S0 ; Drive 1 goes forwards
    M569 P2 S0 ; Drive 2 goes forwards
    M569 P3 S0 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80 Y80 Z800 E446.23 ; Set steps per mm
    M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
    M203 X10000 Y10000 Z1000 E1200 ; Set maximum speeds (mm/min)
    M201 X800 Y800 Z250 E2500 ; Set accelerations (mm/s^2)
    M906 X1600 Y1600 Z1600 E800 ; Set motor currents (mA)
    M84 S0 ; Disable motor idle current reduction

    ; Heaters
    M143 S260 ; Set maximum heater temperature to 260C
    M140 H-1 ; Disable heated bed
    M305 P1 B4725 C7.060000e-8 ; Set thermistor + ADC parameters for heater 1

    ; Tools
    M563 P0 D0 H1 F1 ; Define tool 0
    G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

    ; Network
    M550 PBig Boy ; Set machine name
    M551 PNo1Knows ; Set password
    M552 S1 ; Enable network
    ; Access point is configured manually via M587 by the user
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Fans
    M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P2 S1 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

    ; Custom settings are not configured

    ; Miscellaneous
    T0 ; Select first tool



  • What do you have in your homeall.g and homez.g macros?



  • ; homeall.g
    ; called to home all axes
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Oct 26 2017 22:04:46 GMT-0500 (Central Daylight Time)

    ; Relative positioning
    G91

    ; Lift Z
    G1 Z5 F6000

    ; Course home X or Y
    G1 X-465 Y-465 F1800 S1
    ; Course home X
    G1 X-465 S1
    ; Course home Y
    G1 Y-465 S1

    ; Move away from the endstops
    G1 X5 Y5 F6000

    ; Fine home X
    G1 X-465 F360 S1
    ; Fine home Y
    G1 Y-465 S1

    ; Move Z down until the switch triggers
    G1 Z-455 F1800 S1

    ; Absolute positioning
    G90

    ; Tell the firmware where we are
    G92 Z2.5

    ; Uncomment the following line to lift the nozzle after probing
    ;G1 Z5 F100



  • ; homez.g
    ; called to home the Z axis
    ;
    ; generated by RepRapFirmware Configuration Tool on Thu Oct 26 2017 22:04:46 GMT-0500 (Central Daylight Time)

    ; Move quickly to X axis endstop and stop there (first pass)
    G1 Z-465 F1800 S1

    ; Go back a few mm
    G91
    G1 Z5 F6000
    G90

    ; Move slowly to X axis endstop once more (second pass)
    G1 Z-465 F360 S1



  • This is some gcode that doesn't work.

    G90
    M82
    M106 S255
    G4 P500
    M106 S0
    M104 S205 T0
    M109 S205 T0
    G28 ; home all axes
    G92 E0
    G1 E-1.2000 F3000
    G1 Z0.300 F990
    ; process Process2
    ; layer 1, Z = 0.300



  • Turns out the home all has an offset of 2.5 set after z home. Removed that and it appears to work fine.


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