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Cartesian - Z-endstop & homing (Max or Min)?

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  • undefined
    Dougal1957
    last edited by 3 Feb 2018, 08:48

    um strange one

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    • undefined
      RGN01
      last edited by 3 Feb 2018, 08:50

      Yeah, it has me stumped!

      Richard

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      • undefined
        RGN01
        last edited by 3 Feb 2018, 19:57

        Not sure if I mentioned, so adding the firmware version:

        Firmware Name:	        RepRapFirmware for Duet WiFi
        Firmware Electronics:	Duet WiFi 1.0
        Firmware Version:	1.20 (2017-12-23)
        WiFi Server Version:	1.20
        Web Interface Version:	1.20
        
        

        Richard

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        • undefined
          dc42 administrators
          last edited by 3 Feb 2018, 21:46

          After you do Z homing, are you certain that if you command the printer to Z=0 the nozzle is just touching the bed? A very small number of users have reported that their IR sensors sometimes have a secondary trigger height some distance above the proper one. In such cases we have replaced the sensor.

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • undefined
            RGN01
            last edited by 3 Feb 2018, 22:42

            Thanks, David. It is perhaps easiest if I explain what I'm doing. I ran my homez.g:

            ;Z-Probe endstop
            G1 X110 Y110
            G91			; relative positioning
            G1 S1 Z-250 F9000	; move quickly to Z axis endstop and stop there (first pass)
            G1 Z5 F6000       	; go back a few mm
            G1 S1 Z-250 F360  	; move slowly to Z axis endstop once more (second pass)
            G1 Z2 F4000      	; raise Z again
            G90               	; absolute positioning
            
            

            After running that, the nozzle stopped about 4.5mm from the bed but the Z-height displayed on DWC was 2.0mm. Issuing G1 Z0 dropped the nozzle to about 2.4mm above the bed but DWC height shows 0mm.

            The measured heights were measured using a stack of Post-It notes and a vernier so there is a reasonably large margin of error! 🙂

            I tried this with bed compensation enabled and disabled and it made no noticeable difference.

            Running bed compensation immediately after this returns "Mean error: -2.591 mm" but the bed is very close to level.

            Was the false detect of those IR probes about 2 to 2.5mm greater than the main trigger distance?

            Richard

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            • undefined
              RGN01
              last edited by 3 Feb 2018, 23:00

              OK, I think I have found the issue - somehow my homeall.g, did not have G30 in it. Not at all sure how I lost it but added it back and it seems to be working correctly.

              I'm sorry for the confusion - I've been battling this for days and somehow overlooked that missing G30!

              Richard

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              • undefined
                dc42 administrators
                last edited by 4 Feb 2018, 07:35

                I'm glad you solved it. Your homez.g file should also be using G30, not G1 S2 Z moves. See https://duet3d.com/wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer#Homing_Z.

                Duet WiFi hardware designer and firmware engineer
                Please do not ask me for Duet support via PM or email, use the forum
                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                • undefined
                  RGN01
                  last edited by 4 Feb 2018, 14:12

                  Thanks, David. I've now reverted to the Z-max endstop and am using the probe for probing prior to a print. I will write up my settings etc. in a new thread as it may help someone else get this combination working (e3d Chimera, IR probe and Z-max endstop).

                  I really do appreciate you help - thank you!

                  Richard

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                  • undefined
                    SputnikOC3d
                    last edited by 11 Feb 2018, 22:29

                    Interested in the settings needed to get Z max endstop with Z min [ probe ] workign correctly. my current config doesnt actually stop the Z+ movement when the endstop is triggered

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                    • undefined
                      RGN01
                      last edited by 12 Feb 2018, 06:33

                      @SputnikOC3d:

                      Interested in the settings needed to get Z max endstop with Z min [ probe ] workign correctly. my current config doesnt actually stop the Z+ movement when the endstop is triggered

                      Details of my printer and the config files are here https://www.duet3d.com/forum/thread.php?id=4306

                      Hope this helps.

                      Richard

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                      • undefined
                        SputnikOC3d
                        last edited by 12 Feb 2018, 08:01

                        @RGN01:

                        @SputnikOC3d:

                        Interested in the settings needed to get Z max endstop with Z min [ probe ] workign correctly. my current config doesnt actually stop the Z+ movement when the endstop is triggered

                        Details of my printer and the config files are here https://www.duet3d.com/forum/thread.php?id=4306

                        Hope this helps.

                        Richard

                        Thanks Richard … Im looking at this ..

                        ; Endstops Z-probe
                        M574 X1 Y2 S1 ; Set active high [ NC ] endstops
                        M574 Z2 S0 ; set active low [ NO ] endstops
                        M558 P1 H6 F300 T8000 ; Set Z probe type to unmodulated and the dive height + speeds
                        G31 P500 X9 Y21 Z2.2 ; Set Z probe trigger value, offset and trigger height
                        M557 X10:220 Y25:220 S20 ; Define mesh grid

                        Is it possible I need a NO normally OPEN type switch for this to work when using a probe on this axis? Mine is currently NC. I cant understand why that would be … but - ya never know ...

                        Also may I ask another probably dumb question ... How did you determine the X/Y offsets off the probe on your G31 code? My BL touch mounts into a Prusa MK2 extruder assmbly.... and I dont think the thingiverse creator of the add on probe mount took any time to CAD that data out ... and Im not sure how to accurately measure these offset ... Is there a tutorial or a guide somewhere _ive looked - no find ...

                        PS - I noted your max speeds and current settings are far greater than mine ... NEMA 17s on this printer? My Z is kinda noisy and my speeds arent all that exciting. Was hoping to get quieter and faster ... think I need 24v vs. my 12v PSU ... and to uptick the power and speeds ...

                        Thanks for any help you could share here

                        All the best,

                        Steve

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                        • undefined
                          Stoop
                          last edited by 12 Feb 2018, 16:47

                          @dc42:

                          Yes, except:

                          1. You probably want something more like G1 X100 Y100 Z5 so that bed probing starts from 5mm height.

                          2. You should not use G92 to set the Z height after the G30. Use the G31 Z parameter instead.

                          So, I'm VERY new to 3d printing.
                          WHY don't you wanna use G92 after G30?

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                          • undefined
                            dc42 administrators
                            last edited by 12 Feb 2018, 18:28

                            @Stoop:

                            WHY don't you wanna use G92 after G30?

                            The firmware needs to know the Z probe trigger height anyway for other bed probing purposes. There is no point in putting the same information in two different places, you will just confuse yourself if/when that value changes.

                            Duet WiFi hardware designer and firmware engineer
                            Please do not ask me for Duet support via PM or email, use the forum
                            http://www.escher3d.com, https://miscsolutions.wordpress.com

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