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Z-probe commissioning problem

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Smart effector for delta printers
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  • undefined
    number40fan
    last edited by 30 Sept 2017, 22:10

    Can you paste what is in it?

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    • undefined
      MoS-tekknix
      last edited by 30 Sept 2017, 22:11

      Please show us your config-override.g

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      • undefined
        RGN01
        last edited by 30 Sept 2017, 22:11

        @number40fan:

        @RGN01:

        I've also homed the printer and slowly dropped the nozzle until it just touches the bed. The Z-height readings were:
        Homed: 645.0
        Touching bed: 212.5

        This is what I don't get. When you home a printer, it doesn't count how far it moved until it activates the endstop switches. It just moves until it hits them, backs off, moves slowly until it hits again and usually moves away 5mm or so. That is your homed height. The Duet then uses your H number from M665 to determine how far above the bed the nozzle is. How was yours showing 645 with 550 in the M665? Do you have a config-override.g file?

        OK, just realised that was a typo - 645 should have been 445. I'm really sorry for the confusion!

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        • undefined
          MoS-tekknix
          last edited by 30 Sept 2017, 22:12

          No need to say sorry for anything. Still interessted in the override-settings….

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            number40fan
            last edited by 30 Sept 2017, 22:13

            Have you ran anything that required a M500 command like a hotend or heat bed calibration?

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            • undefined
              RGN01
              last edited by 30 Sept 2017, 22:14

              @number40fan:

              Have you ran anything that required a M500 command like a hotend or heat bed calibration?

              Yes, I did that twice - for bed PID and hotend PID auto tune.

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              • undefined
                number40fan
                last edited by 30 Sept 2017, 22:15

                @RGN01:

                OK, just realised that was a typo - 645 should have been 445. I'm really sorry for the confusion!

                But it still showed 212 touching the bed?

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                • undefined
                  MoS-tekknix
                  last edited by 30 Sept 2017, 22:15

                  Please paste the content in.

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                  • undefined
                    RGN01
                    last edited by 30 Sept 2017, 22:34

                    The config-override.g file looks like this:

                    [[language]]
                    ; This is a system-generated file - do not edit
                    ; Delta parameters
                    M665 R246.6 L440.0 B180 H433
                    M666 X0.000 Y0.000 Z0.000 A0.00 B0.00
                    ; Heater model parameters
                    M307 H0 A645.6 C1147.3 D12.1 S1.00 B0
                    M307 H1 A533.4 C223.7 D3.0 S1.00 B0
                    M307 H2 A340.0 C140.0 D5.5 S1.00 B0
                    M307 H3 A340.0 C140.0 D5.5 S1.00 B0
                    M307 H4 A340.0 C140.0 D5.5 S1.00 B0
                    M307 H5 A340.0 C140.0 D5.5 S1.00 B0
                    M307 H6 A340.0 C140.0 D5.5 S1.00 B0
                    M307 H7 A340.0 C140.0 D5.5 S1.00 B0
                    ; Z probe parameters
                    G31 T1 P100 X0.0 Y0.0 Z-0.10
                    G31 T3 P500 X0.0 Y0.0 Z0.70
                    G31 T4 P500 X0.0 Y0.0 Z0.00
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                    • undefined
                      RGN01
                      last edited by 30 Sept 2017, 22:37

                      I removed the bed to check on the fans in the control box. After re-installing,, the homed Z-height now reads 441.39 and it reads 9.39 when touching the bed.

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                      • undefined
                        MoS-tekknix
                        last edited by 30 Sept 2017, 22:38

                        Mhh, the override File looks okay to me.

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                        • undefined
                          RGN01
                          last edited by 30 Sept 2017, 22:44

                          It really has me confused!

                          Even more so - I've now deleted that deployprobe.g file and it now runs G30 OK!
                          Homed, Z-height is 441.39, touching bed it is 0 so that looks OK to me.

                          The only thing still worrying me is that the G30 leaves the nozzle set at -0.1 - how do I change that so that it retracts and clears the bed afterwards?

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                          • undefined
                            number40fan
                            last edited by 30 Sept 2017, 22:45

                            The G30 is only going to probe once. That is all. G32 time.

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                              RGN01
                              last edited by 30 Sept 2017, 22:50

                              Hooray! That seems to be working well now. Thank you so much!

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                                number40fan
                                last edited by 30 Sept 2017, 22:51

                                What do you have in your bed.g file?

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                                • undefined
                                  RGN01
                                  last edited by 30 Sept 2017, 22:52

                                  Bed.g

                                  [[language]]
                                  ; Auto calibration routine for delta printers
                                  ; Before running this, you should have set up your zprobe Z offset to suit your build, in the G31 command in config.g.
                                  M561 ; clear any bed transform, otherwise homing may be at the wrong height
                                  G31 X0 Y0 ; don't want any probe offset for this
                                  G28 ; home the printer
                                  ;*** Remove the following line if your Z probe does not need to be deployed
                                  ;M98 Pdeployprobe.g ; deploy the mechanical Z probe
                                  ; The first time the mechanical probe is used after deployment, it gives slightly different results.
                                  ; So do an extra dummy probe here. The value stored gets overwritten later. You can remove this if you use an IR probe.
                                  ;G30 P0 X0 Y0 Z-99999
                                  ; Probe the bed and do 6- or 7-factor auto calibration
                                  G30 P0 X-73.6 Y-42.5 Z-99999 ; X tower
                                  G30 P1 X0 Y-85 Z-99999 ; between X and Y towers
                                  G30 P2 X73.6 Y-42.5 Z-99999 ; Y tower
                                  G30 P3 X73.6 Y20 Z-99999 ; between Y and Z towers
                                  G30 P4 X0 Y67 Z-99999 ; Z tower
                                  G30 P5 X-73.6 Y20 Z-99999 ; between Z and X towers
                                  G30 P6 X-36.8 Y-21.25 Z-99999 ; half way to X tower
                                  G30 P7 X36.8 Y-21.25 Z-99999 ; half way to Y tower
                                  G30 P8 X0 Y42.5 Z-99999 ; half way to Z tower
                                  G30 P9 X0 Y0 Z-99999 S6 ; centre, and auto-calibrate 6 factors
                                  ;*** Remove the following line if your Z probe does not need to be retracted
                                  ;M98 Pretractprobe.g ; retract the mechanical Z probe
                                  G1 X0 Y0 Z150 F15000 ; get the head out of the way of the bed
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                                    number40fan
                                    last edited by 30 Sept 2017, 22:59

                                    That should work just fine. Those are points for a 200mm bed though, If you ever want to probe further out, just add in more G30 P* lines.

                                    You can now add a M557 R180 S20 (might need a larger S number with firmware 1.19) to the bottom of your config.g file and run a bed mesh calibration after your auto calibration to see a graphical view of your bed.

                                    Edit: Maybe a smaller R number so you are not probing at the edge of the bed,

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                                      number40fan
                                      last edited by 30 Sept 2017, 23:01

                                      Also, M665 and M666 will show you the values that the auto calibration came up with after the probing. M500 will save them to your config-override.g file for you.

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                                        RGN01
                                        last edited by 30 Sept 2017, 23:19

                                        Thank you so much, number40fan - I will do that tomorrow.

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                                        • undefined
                                          Dougal1957
                                          last edited by 1 Oct 2017, 09:36

                                          Richard

                                          run the script at http://www.escher3d.com/pages/wizards/wizardbed.php using the params for your bed and it will generate a BED.G For you but edit the supplied file replacing the S6 at the end of the last G30 line with S8 so that it adjust for tilt as well.

                                          Doug

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