2 Z motors, to endstops



  • Hi there,

    no success with the probe, so i want to go back to "normal" endstops. my printer has 2 Z motors and i always had small problems with them because they are not synced.

    parts are printed, endstops on the way, so i´ve read a lot about this topic.
    here´s my starting point (only config.g for the moment)

    M667 S1 ; Select CoreXY mode

    ; Network
    M550 P"MKC" ; Set machine name
    M552 S1 ; Enable network
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Specials

    M307 H2 A-1 C-1 D-1 ; disable the heater functionality

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z160 E420.00 ; Set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X30000.00 Y30000.00 Z4000.00 E4000.00 ; Set maximum speeds (mm/min)
    M201 X1500.00 Y1500.00 Z500.00 E10000.00 ; Set accelerations (mm/s^2)
    M906 X800.00 Y800.00 Z800.00 E800.00 I40 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y-1 Z0 S1 ; Set axis minima
    M208 X240 Y260 Z300 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S0

    ; Z-Probe
    ;M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed
    ;M557 X14:13 Y14:195 S20 ; Define mesh grid

    now the changes. Z motors are on drive 2 and 4.
    I added/edited the marked lines

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards Z @ Xmax
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards Z @ Xmin
    M584 X0 Y1 Z2:4 E3 U4 P3 ; two Z motors connected to driver outputs Z and E1 Hide U
    M350 X16 Y16 Z16 U16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z160 U160 E420.00 ; Set steps per mm
    M566 X900.00 Y900.00 Z12.00 U12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X30000.00 Y30000.00 Z4000.00 U4000.00 E4000.00 ; Set maximum speeds (mm/min)
    M201 X1500.00 Y1500.00 Z500.00 U500.00 E10000.00 ; Set accelerations (mm/s^2)
    M906 X800.00 Y800.00 Z800.00 U800.00 E800.00 I40 ; Set motor currents (mA) and motor idle factor in per cent

    ; Axis Limits
    M208 X0 Y-1 Z0 S1 ; Set axis minima
    M208 X240 Y260 Z300 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 Z1 U1 S0 ; Set active high endstops

    the motor connected to Z is at Xmax of the bed and gets the endstop connected to Z.
    the motor connected to E1 is at Xmin and gets the endstop E1

    correct so far? not really sure about the M584 and M574

    Thanks in advance



  • It appears to me that you have most of the groundwork done. I'm still able to auto-level using the probe, so this isn't going to be my solution.

    You will want to add Z and U to your M574 endstop definitions.

    The U endstop should be connected to the E1 (drive 4) endstop.

    I don't know offhand the correct way to handle the homez.g and homeall.g files from that point. My expectation would be to "lift" the U axis by a small amount to ensure that the Z endstop homes first, then use a G0 S1 Z-300 to home the Z axis, then G0 S1 U-5 to home the U axis afterwards, but then there is very probably a better way to do that.

    Using this logic, homez.g might look like:

    ;homez.g
    G91                 ; relative positioning
    G1 U2 S2 F3000      ; Raise the "U" axis by 2mm -- home Z first please.
    G1 Z-300 S1 F300    ; Home the Z endstop
    G1 U-3 S1 F300      ; home the U endstop
    G1 Z3 F6000         ; Lift a few mm
    G1 Z-5 F300 S1      ; Re-home to the Z switch
    

    It won't deal with much of a difference between U and Z, it will error if U was more than 1mm higher than Z, and could get ugly if U was more than 2mm lower than Z.



  • Hi.

    Thanks. In the guide is described, how to split Z to U and Z for homing. It's on the list for Today



  • paste and copy from the guide. just changed 3 to 4
    unfortunately, the endstops are not delivered. i hope for tomorrow...
    i´ll test asap

    M584 Z2:4 U4 P4 ; split z control

    G1 S1 Z-350 U-350 F1000
    G1 Z5 U5 F500
    G1 S1 Z-10 U-10
    M584 Z2:4 P3 ; combine Z
    G90
    G92 Z0





  • Hi there,

    i got it working. but not with drive 2&4. U didn´t move. tried a few things, no luck. So i changed it to 2&3 for Z and 4 for the extruder. worked immediately. i don´t know why, but it´s ok. maybe drive 4 has to be the V axis?

    now, there is one small issue. when i power on the printer, i have to home Z first. when i try to home X or Y before, nothing happens???
    what could that be?

    config.g and homing files:

    homez
    G91 ; relative positioning

    M584 Z2 U3 P4 ; split z control

    G1 S1 Z-350 U-350 F2000
    G1 Z5 U5 F400
    G1 S1 Z-10 U-10
    M584 Z2:3 P3 ; combine Z
    G90
    G92 Z0

    homey
    G91 ; relative positioning
    G1 S1 Y-300 F5000 ; move quickly to Y axis endstop and stop there (first pass)
    G1 Y5 F3600 ; go back a few mm
    G1 S1 Y-206 F360 ; move slowly to Y axis endstop once more (second pass)
    G90 ; absolute positioning

    homex
    G91 ; relative positioning
    G1 S1 X-300 F5000 ; move quickly to X axis endstop and stop there (first pass)
    G1 X5 F360 ; go back a few mm
    G1 S1 X-206 F360 ; move slowly to X axis endstop once more (second pass)
    G90 ; absolute positioning

    homeall
    G91 ; relative positioning
    G1 S1 X-300 Y-300 F5000 ; move quickly to X or Y endstop and stop there (first pass)
    G1 S1 X-300
    G1 S1 Y-300
    G1 X10 Y10 F6000 ; go back a few mm
    G1 S1 X-20 F360 ; move slowly to X axis endstop once more (second pass)
    G1 S1 Y-20 ; then move slowly to Y axis endstop
    M98 Phomez.g

    config.g
    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards Z @ Xmax
    M569 P3 S1 ; Drive 3 goes forwards Z @ Xmin
    M569 P4 S1 ; Drive 4 goes forwards
    M584 X0 Y1 Z2:3 U3 E4 P3 ; two Z motors connected to driver outputs Z and E0 Hide U
    M350 X16 Y16 Z16 U16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z160 U160 E420.00 ; Set steps per mm
    M566 X900.00 Y900.00 Z12.00 U12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X30000.00 Y30000.00 Z4000.00 U4000.00 E4000.00 ; Set maximum speeds (mm/min)
    M201 X1500.00 Y1500.00 Z500.00 U500.00 E10000.00 ; Set accelerations (mm/s^2)
    M906 X800.00 Y800.00 Z800.00 U800.00 E800.00 I40 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S3000 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y-1 Z0 S1 ; Set axis minima
    M208 X240 Y260 Z288 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; Set active high endstops
    M574 Z1 U1 S1



  • @torro said in 2 Z motors, to endstops:

    when i power on the printer, i have to home Z first. when i try to home X or Y before, nothing happens???

    This sounds like your Z motor is connected to X (drive 0) connector. If you home Z, what DWC shows? Homed X i guess.



  • No, all is running correct AFTER i homed Z.
    nothing moves if Z is not homed.



  • Please post your full config.g as well as config-override.g, (those on duet sd card, not somewhere in your computer, to eliminate possibilty that your backup ones in computer are not up to date)



  • Hi,

    no config-override in the system.

    ; Configuration file for Duet WiFi (firmware version 1.21)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2 on Sat Nov 24 2018 10:45:17 GMT+0100 (Mitteleuropäische Normalzeit)

    ; General preferences
    M80
    G90 ; Send absolute coordinates...
    M83 ; ...but relative extruder moves

    M667 S1 ; Select CoreXY mode

    ; Network
    M550 P"MKC" ; Set machine name
    M552 S1 ; Enable network
    M586 P0 S1 ; Enable HTTP
    M586 P1 S0 ; Disable FTP
    M586 P2 S0 ; Disable Telnet

    ; Specials

    M307 H2 A-1 C-1 D-1 ; disable the heater functionality

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards Z @ Xmin
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards Z @ Xmax
    M584 X0 Y1 Z2:3 U3 E4 P3 ; two Z motors connected to driver outputs Z and E1 Hide U
    M350 X16 Y16 Z16 U16 E16 I1 ; Configure microstepping with interpolation
    M92 X80.00 Y80.00 Z160 U160 E420.00 ; Set steps per mm
    M566 X900.00 Y900.00 Z12.00 U12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X30000.00 Y30000.00 Z4000.00 U4000.00 E4000.00 ; Set maximum speeds (mm/min)
    M201 X1500.00 Y1500.00 Z500.00 U500.00 E10000.00 ; Set accelerations (mm/s^2)
    M906 X800.00 Y800.00 Z800.00 U800.00 E800.00 I40 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S3000 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y-1 Z0 S1 ; Set axis minima
    M208 X240 Y260 Z288 S0 ; Set axis maxima

    ; Endstops
    M574 X1 Y1 S0 ; Set active high endstops
    M574 Z1 U1 S1

    ; Z-Probe
    ;M558 P1 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed;
    ;G31 P500 X0 Y50 Z1.45
    ;M557 X20:220 Y70:240 S20 ; Define mesh grid

    ; Heaters
    M305 P0 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 0
    M143 H0 S130 ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280 ; Set temperature limit for heater 1 to 280C
    M307 H1 A438.2 C134.9 D3.9 B0

    ; Fans
    M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 T45:55 H100:101:102 ; Set fan 2 value,
    M912 P0 S-3,5

    ; Tools
    M563 P0 D0 H1 ; 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

    ; Automatic power saving
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

    ; Custom settings are not configured

    ;



  • Ok, config seems to be ok. So what exactly happens if you send G28 from DWC gcode console? If nothing moves, there should be some response message from duet why nothing moves. What that message says?



  • Just started a print...

    yesterday, there was no message from DWC.
    A click on "home all" did nothing, but i couldn´t move the motors by hand anymore.

    will test G28 asap



  • after powering up the printer, a single G28 without any parameter does nothing. the circle in the "send" button spins and spins and spins. when i click "emergency stop", a message "homing failed" appears.

    then i homed only Z. works. after that, G28 works without any issue, same as the button "homeall"



  • That is odd. You are not supposed to be able home Z at all before X and Y are not homed. What firmware version are you using and what version of DWC?



  • Duet Web Control 2.0.0-RC3

    Electronics: Duet WiFi 1.02 or later
    Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.02(RTOS) (2018-12-24b1)
    Duet WiFi Server Version: 1.22



  • @torro said in 2 Z motors, to endstops:

    homeall
    G91 ; relative positioning
    G1 S1 X-300 Y-300 F5000 ; move quickly to X or Y endstop and stop there (first pass)
    G1 S1 X-300
    G1 S1 Y-300
    G1 X10 Y10 F6000 ; go back a few mm
    G1 S1 X-20 F360 ; move slowly to X axis endstop once more (second pass)
    G1 S1 Y-20 ; then move slowly to Y axis endstop
    M98 Phomez.g

    Try changing M98 Phomez.g to G28 Z



  • Ok. I will try.



  • I didn't test it yet, but i have an idea, i could put the home Z order on top in the first line. I Guess it works... 🙂



  • On my CoreXY also with 2 Z-Motors and 2 Endstops (1 for Z and 1 for U - Drive 2 and 3) i have to home Z also at first.

    Only for example - without any garanty - see my homeall.g:

    ; ##############  homeall.g -> called to home all axes  ##############
    
    M98 Phomez.g                 ; X homing
    
    M98 Phomex.g                 ; Y homing
    
    M98 Phomey.g                 ; Z homing
    
    G90
    
    
    ; #################    checking trigger height + Z null adjusting    #################
    G1 X144 Y150 F12000
    G1 Z20 F1800
    G1 Z15 F1200
    G1 Z10 F600
    T0
    G30                            ; Probe the bed at the current XY position, set the Z coordinate to the probe trigger height
    G4 P200
    G1 Z50 F1800
    
    ; END OF FILE
    

    and my homez.g:

    ; ##############  homez.g -> called to home the Z axis  ##############
    
    G91                         ; relative positioning
    
    M584 Z2 U3 P4               ; Split Z into 2 (Z+U)
    
    G1 S1 Z999 U999 F600        ; Move the bed down in the Z direction. S1 to stop if endstop is triggered
    G1 S2 Z-3 U-3 F600          ; Move the bed up 3mm in the -Z direction, ignore if axis are not homed
    G1 S1 Z9 U9 F200            ; Move slowly in the +Z direction again to stop exactly at the homing switch
    M400                        ; Wait for current moves to finish
    
    G4 P100
    G1 S2 Z0.00 U0.00 F200      ; Compensation the limit switch from z-axis drive 2 (!!can be adjusted here!!)
    G4 P100
    
    M584 Z2:3 P3                ; Join U to Z again
    G4 P100
    
    G92 Z282.00                 ; set position of Z relativ to the bed (!!must be adjusted here!!)
    
    G90                         ; Back to absolute mode
    
    G1 S2 Z270 F900
    ; End of file
    


  • Good to know. Thanks!


 

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