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    Ir probe results

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    IR Height Sensor
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    • gbiskiundefined
      gbiski
      last edited by

      I am running for the first time an IR probe on Duet WiFi with the mini height IR sensor board. I ran a G29 command from duet and the results were the following:

      Number of probe points: 16
      Probe area: 144.0 cm²
      Maximum deviations: -0.382 / -0.125 mm
      Mean error: -0.279 mm
      RMS error: 0.076 mm

      Are these results within a normal range ?

      After this I just have to add a G92 command on my start gcode script on Simplify3d in order to have a bed compensation in every print ?

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @gbiski
        last edited by

        @gbiski said in Ir probe results:

        I am running for the first time an IR probe on Duet WiFi with the mini height IR sensor board. I ran a G29 command from duet and the results were the following:

        Number of probe points: 16
        Probe area: 144.0 cm²
        Maximum deviations: -0.382 / -0.125 mm
        Mean error: -0.279 mm
        RMS error: 0.076 mm

        Are these results within a normal range ?

        That depends on the details of the height map. Can you increase the number of points (e.g. form 4x4 to 10x10) and publish a screen shot of the height map here? A higher resolution height map will make it clearer whether the deviation is caused mostly by the printing plane not being flat or by the IR sensor not having a consistent trigger height.

        After this I just have to add a G92 command on my start gcode script on Simplify3d in order to have a bed compensation in every print ?

        I think you mean G29. You can use G29 (or G29 S0, which means the same thing) if you want to probe the bed each time, or G29 S1 if you want to load the height map from the last time you probed.

        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

        gbiskiundefined 1 Reply Last reply Reply Quote 0
        • gbiskiundefined
          gbiski @dc42
          last edited by

          @dc42 0_1543349324098_Screenshot 2018-11-27 22.07.01.png I did one with 64 points. What do you think ?

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          • dc42undefined
            dc42 administrators
            last edited by

            It has an overall Z offset, but it looks nice and flat.

            How are you 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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            • gbiskiundefined
              gbiski
              last edited by

              I am homing with an Endstop that I have placed on the bottom of the printer. I attached 2 photos to see. I also made another screenshoot of the same mesh from another perspective to see it.

              1_1543383941725_Screenshot 2018-11-27 22.10.48.png 0_1543383941725_Screenshot 2018-11-27 22.11.09.png

              1_1543384339498_IMG_1819.JPG 0_1543384339498_IMG_1817.JPG

              dc42undefined 1 Reply Last reply Reply Quote 0
              • dc42undefined
                dc42 administrators @gbiski
                last edited by

                @gbiski said in Ir probe results:

                I am homing with an Endstop that I have placed on the bottom of the printer.

                So the endstop and the Z probe disagree on where Z=0 is. Find out which one is wrong, and correct it.

                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

                gbiskiundefined 1 Reply Last reply Reply Quote 0
                • gbiskiundefined
                  gbiski @dc42
                  last edited by

                  @dc42 Is it better to remove the end stop and let only the probe making the z homing ?

                  dc42undefined 1 Reply Last reply Reply Quote 0
                  • dc42undefined
                    dc42 administrators @gbiski
                    last edited by

                    @gbiski said in Ir probe results:

                    @dc42 Is it better to remove the end stop and let only the probe making the z homing ?

                    That's entirely up to you. Some people prefer to keep a Z endstop in case the probe collides with a print and gets damaged.

                    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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                    • gbiskiundefined
                      gbiski
                      last edited by

                      Can I ask what I do wrong ? I homed the Z with the Endstop. At the centre of the bed the distance was just equal to be able to drag a paper. So I guess the Endstop zeroed correctly. I measured with a caliper the distance between the lower end of the ir sensor and the nozzle (bed when homed at the centre).
                      This offset was 2,6mm and the leds of the ir sensor were open when the nozzle was homed. I put this value (2,6) on the trigger heigh field on the configurator. I uploaded the new configuration.
                      But when I run after all these again an auto bed compensation I get the following results:

                      0_1543521882115_Screenshot 2018-11-29 21.55.44.png

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        @gbiski said in Ir probe results:

                        Can I ask what I do wrong ? I homed the Z with the Endstop. At the centre of the bed the distance was just equal to be able to drag a paper. So I guess the Endstop zeroed correctly.

                        Your Z homing s set up correctly if, when you home Z and then command the head to Z=0 and some suitable XY position, it just drags the paper. The position after homing is not necessarily Z=0, it depends on what you have in your homing files.

                        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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