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    Wrong position after homing axes

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    • CoolM8undefined
      CoolM8
      last edited by

      I haven't found the time too look at it. Now I think I might have found something:

      When I home X and Y it works fine and when the endstops trigger, the print head stops immediately. But when when i manually control the print head movement or homing Z, the motors do not stop wen the endstop triggers. Therefore when homing Z moves to X0, it hits the endstop but it does not stop the motor. So I end up with an Offset in X.

      What I see is, the manual movement through WebControl sends this: G1 X-210 F1200.
      Homing sends this: G1 X-210 F1200 S1
      So the S1 parameter makes the edstops work. Now G30 must be using the move commands without S1.

      When I do the following change in config.g:
      M564 H0 S0 to M564 H0 S1
      Then, both G1 X-210 F1200 S1 works as does G1 X-210 F1200. That's because it limits the axis by calculation and not by the endstops anymore. However, G30 still hits the endstop but the motor keeps running for a short time as seen in the video here:
      https://youtu.be/9m7Y-PwS-pI

      How can I force G30 to make use of the axis limitation as well? Or can I somehow use the endstops all the time without using the calculated axes?

      Phaedruxundefined 1 Reply Last reply Reply Quote 0
      • CoolM8undefined
        CoolM8
        last edited by

        When I move to X100 Y100 in homeZ and then call G30, why does G30 move anyway? In the documentations it says: "Probe the bed at the current XY position".

        HomeZ.g:
        ; Lift Z relatively to current position
        G91
        G1 Z5 F6000 S2

        ; Back to absolute positioning
        G90

        ; Go to first bed probe point and home the Z axis
        G1 X100 Y100 F6000
        G30

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        • Phaedruxundefined
          Phaedrux Moderator @CoolM8
          last edited by

          @CoolM8 said in Wrong position after homing axes:

          when when i manually control the print head movement or homing Z, the motors do not stop wen the endstop triggers.

          This is as expected. The endstops are only acting when there is a homing move (G1 S1).

          G30 doesn't do any X or Y movement. You have to position the probe manually first. G30 will only move the Z axis.

          @CoolM8 said in Wrong position after homing axes:

          why does G30 move anyway?

          I don't know, I haven't seen your full config yet.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • CoolM8undefined
            CoolM8
            last edited by

            This is my full config.g:

            ; General preferences
            M111 S1 ; Debugging off
            G21 ; Work in millimetres
            G90 ; Send absolute coordinates...
            M83 ; ...but relative extruder moves
            M555 P2 ; Set firmware compatibility to look like Marlin
            M564 H0 S1

            M208 X0 Y0 Z0 S1 ; Set axis minima
            M208 X180 Y180 Z205 S0 ; Set axis maxima
            M669 K0

            ; Endstops
            M574 X1 Y1 S0 ; Define active low and unused microswitches
            M574 Z1 S2
            M558 P1 H5 F120 T6000
            M557 X0:180 Y15:180 S20 ; Define mesh grid
            G31 P500 X40 Y0 Z0.35 ; Set Z probe trigger value, offset and trigger height

            ; Drives
            M569 P0 S0 ; Drive 0 goes forwards
            M569 P1 S1 ; Drive 1 goes forwards
            M569 P2 S0 ; Drive 2 goes forwards
            M569 P3 S1 ; Drive 3 goes forwards
            M350 X32 Y32 Z8 E16 I0 ; Configure microstepping without interpolation
            M92 X157.4804 Y157.4804 Z533.3333 E832 ; Set steps per mm
            M566 X1200 Y1200 Z480 E120 ; Set maximum instantaneous speed changes (mm/min)
            M203 X8100 Y8100 Z300 E1200 ; Set maximum speeds (mm/min)
            M201 X500 Y500 Z100 E250 ; Set accelerations (mm/s^2)
            M906 X1200 Y1200 Z1100 E1100 I30 ; Set motor currents (mA) and motor idle factor in per cent
            M84 S30 ; Set idle timeout

            ; Heaters
            M143 S290; Set maximum heater temperature to 310C
            M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
            M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
            ;M305 P1 R4700 T100000 B4388
            M305 P1 X200

            ; 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

            ; Network
            M550 PUltimaker ; Set machine name
            M552 S1 ; Enable network and acquire dynamic address via DHCP

            ; Fans
            M106 P0 S1 I0 F500 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
            ;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

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              And homing files?

              Z-Bot CoreXY Build | Thingiverse Profile

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              • Vetiundefined
                Veti
                last edited by

                @CoolM8 said in Wrong position after homing axes:

                M564 H0 S1

                i have pointed out to you earlier that this should not be in the config. why do you insist on having that in your config?

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                • CoolM8undefined
                  CoolM8
                  last edited by

                  @Veti
                  I had M564 H0 in there, because i was used to be able to move the printhead without homed axes with the original printer hardware. When I remove completely, I cannot even home any of my axes, always getting: G0/G1: insufficient axes homed. This is also the case when I have M546 H1 S1.

                  homeX:
                  ; Lift Z relative to current position
                  G91
                  G1 Z5 F6000
                  G90

                  ; Move quickly to X axis endstop and stop there (first pass)
                  G1 X-210 F1200 S1

                  ; Go back a few mm
                  G91
                  G1 X5 F6000
                  G90

                  ; Move slowly to X axis endstop once more (second pass)
                  G1 X-210 F360 S1

                  ; Lower Z again
                  G91
                  G1 Z-5 F6000
                  G90

                  homeY:
                  ; Lift Z relative to current position
                  G91
                  G1 Z5 F6000
                  G90

                  ; Move quickly to Y axis endstop and stop there (first pass)
                  G1 Y-210 F1800 S1

                  ; Go back a few mm
                  G91
                  G1 Y5 F6000
                  G90

                  ; Move slowly to X axis endstop once more (second pass)
                  G1 Y-210 F360 S1

                  ; Lower Z again
                  G91
                  G1 Z-5 F6000
                  G90

                  homeZ:
                  ; Lift Z relatively to current position
                  G91
                  G1 Z5 F6000 S2

                  ; Back to absolute positioning
                  G90

                  ; Go to first bed probe point and home the Z axis
                  G1 X100 Y100 F6000
                  G30

                  ; Uncomment the following lines to lift Z after probing
                  ;G91
                  ;G1 Z5 F100
                  ;G90

                  homeall:
                  ; homeall.g
                  ; called to home all axes
                  ;
                  ; generated by RepRapFirmware Configuration Tool on Wed Apr 19 2017 22:18:05 GMT+0200 (W. Europe Daylight Time)

                  ; Relative positioning
                  G91

                  ; Lift Z
                  G1 Z5 F6000

                  ; Course home X and Y
                  G1 X-210 Y-210 F1800 S1

                  ; Move away from the endstops
                  G1 X5 Y5 F6000

                  ; Fine home X and Y
                  G1 X-210 Y-210 F360 S1

                  ; Absolute positioning
                  G90

                  ; Go to first bed probe point and home Z
                  G1 X100 Y100 F1800

                  G30

                  Phaedruxundefined 1 Reply Last reply Reply Quote 0
                  • Phaedruxundefined
                    Phaedrux Moderator @CoolM8
                    last edited by Phaedrux

                    Thanks for providing the homing files. Makes it much easier.

                    @CoolM8 said in Wrong position after homing axes:

                    G0/G1: insufficient axes homed.

                    This is due to the Z moves to lift the print head above the bed before the axis are homed. M564 H0 is the brute force way of removing the check.

                    Trying to run homez before x and y are homed means that the G1 XY move you have in there has no reference point. X and Y must be homed before homing Z.

                    To correct the insufficient homed axis error without using M564 H0 you must add S2 to the Z moves in your homing files.

                    For example:

                    homeX:
                    ; Lift Z relative to current position
                    G91
                    G1 Z5 F6000
                    G90
                    
                    ; Move quickly to X axis endstop and stop there (first pass)
                    G1 X-210 F1200 S1
                    
                    ; Go back a few mm
                    G91
                    G1 X5 F6000
                    G90
                    
                    ; Move slowly to X axis endstop once more (second pass)
                    G1 X-210 F360 S1
                    
                    ; Lower Z again
                    G91
                    G1 Z-5 F6000
                    G90
                    

                    Would become:

                    homeX:
                    ; Lift Z relative to current position
                    G91
                    G1 Z5 F6000 S2
                    G90
                    
                    ; Move quickly to X axis endstop and stop there (first pass)
                    G1 X-210 F1200 S1
                    
                    ; Go back a few mm
                    G91
                    G1 X5 F6000
                    G90
                    
                    ; Move slowly to X axis endstop once more (second pass)
                    G1 X-210 F360 S1
                    
                    ; Lower Z again
                    G91
                    G1 Z-5 F6000 S2
                    G90
                    

                    Note the S2 on the Z move to raise and lower the print head.

                    The same would apply to the homey, homez and homeall files.

                    Here's a check list to go through to ensure that homing works properly.

                    • 0,0 places the nozzle on the front left corner of the print surface
                    • if the endstop position is beyond 0,0 the axis minima should be negative, this can help account for any offset and keep parts properly positioned on the bed. This means if the nozzle is at the corner of the bed but still needs to move 10mm to the left to trigger the endstop, your axis minima for X is -10.
                    • X+ moves to the right, Y+ moves to the back
                    • homing direction moves towards the endstops
                    • The probe should be positioned so that it is in the middle of the print surface before the G30 command
                    • the XY probe offset and Z trigger height should be measured and inputted into G31 in config.g

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • CoolM8undefined
                      CoolM8
                      last edited by

                      Yes, if I add S2 to my Z-axis movement, I can again properly home X and Y.
                      But G30 still throws the same error when running homeZ or homeAll.

                      Phaedruxundefined 1 Reply Last reply Reply Quote 0
                      • Phaedruxundefined
                        Phaedrux Moderator @CoolM8
                        last edited by

                        @CoolM8 after you home x and y, what happens if you send this manually?

                        G90
                        G1 X100 Y100 F1800
                        G30

                        Z-Bot CoreXY Build | Thingiverse Profile

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                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          Do you meet the points I mentioned?

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • CoolM8undefined
                            CoolM8 @Phaedrux
                            last edited by

                            Yes, everything is configured as you stated in your check list.

                            The command G1 X100 Y100 F1800 moves the print head to the center.
                            G30 throws the error:

                            G30
                            Error: G0/G1: insufficient axes homed
                            
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                            • Phaedruxundefined
                              Phaedrux Moderator
                              last edited by

                              That's really odd. And that's after x and y are homed? Do they show as homed?

                              Can you send G92 Z10 before you send G30?

                              Change Z10 for whatever appears to be close.to the actual z axis height at the time.

                              Z-Bot CoreXY Build | Thingiverse Profile

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                              • Vetiundefined
                                Veti
                                last edited by

                                you made a lot of manual changes to the files from the configurator and changed the order of them.

                                i would suggest you input your parameters in the configurator again and replace all files with the generated ones.

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                                • CoolM8undefined
                                  CoolM8
                                  last edited by

                                  @Phaedrux said in Wrong position after homing axes:

                                  G92 Z10

                                  If I run this before G30, no error is thrown. But the behavior with G30 is still the same: Strange movement in X and wrong placement in the end.

                                  @Veti
                                  Might be a good idea, I will try that tomorrow.

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                                  • Phaedruxundefined
                                    Phaedrux Moderator
                                    last edited by

                                    Just occured to me... Do you have a deployprobe.g and retractprobe.g file in the /sys folder? If so delete them.

                                    Z-Bot CoreXY Build | Thingiverse Profile

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                                    • CoolM8undefined
                                      CoolM8
                                      last edited by

                                      Well, that was it. Now it seems to be working correctly.

                                      Funny, as longer as it takes to solve a problem, the simpler the solution is.

                                      Thank you very much for your support.

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                                      • Phaedruxundefined
                                        Phaedrux Moderator
                                        last edited by

                                        I don't know why it didn't occur to me sooner honestly.

                                        This is why it helps to see every file from the sys folder at once. Get a complete picture.

                                        If you'd followed vetis advice and torched the folder and redid the files you'd have the same result.

                                        Z-Bot CoreXY Build | Thingiverse Profile

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                                        • Vetiundefined
                                          Veti
                                          last edited by

                                          good catch. phaedrux

                                          but out of curiosity. why did you put movement commands into your deployprobe.g ?

                                          Phaedruxundefined 1 Reply Last reply Reply Quote 0
                                          • Phaedruxundefined
                                            Phaedrux Moderator @Veti
                                            last edited by

                                            @Veti It doesn't actually have to have any movement commands in it. I'm not sure exactly what the mechanism here is, but when the files exist when using a probe that doesn't require them you get weird behaviour.

                                            Z-Bot CoreXY Build | Thingiverse Profile

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