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    Mesh Grid Compensation Trial

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    • zerspaner_gerd
      zerspaner_gerd last edited by

      Hi Guys,

      I wanted to test the mesh grid compound before I buy / install a sensor.

      I thought I'd take a Dial Test to drive off the platform (something like this), but I get such results.

      0_1527807990167_Automatic Calibration Results.JPG

      The difference between Nozzle and Dial Test is 7.38mm in Z.
      I have already tried the following variants:

      G31 P-7.38 X14 Y-15 Z-7.38
      G31 P7.38 X14 Y-15 Z7.38
      G31 P-7.38 X14 Y-15 Z7.38
      G31 P7.38 X14 Y-15 Z-7.38
      G31 P-7.38 X14 Y-15 Z7.38
      

      Do I do something wrong or does not work if you do not have an active Z-probe?

      greetings

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

        To generate a height map without using a Z probe, set probe type P0 in the M558 command. Then set up a mesh using M557, run G29 as normal, and follow the prompts in DWC or on PanelDue (this needs fairly recent PanelDue firmware to work).

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

          @dc42

          I did it all so, but I could not adjust the Z offset properly.

          Whether negative or positive with G31

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

            @zerspaner_gerd said in Mesh Grid Compensation Trial:

            @dc42

            I did it all so, but I could not adjust the Z offset properly.

            Whether negative or positive with G31

            G31 sets the trigger height of the Z probe. So if you generate a height map without using a Z probe, G31 does nothing. The Z offset that you get when you generate a height map without a Z probe is the error in your Z=0 position after Z homing. So you should adjust your Z homing position.

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

              @dc42
              This distance, where marked in the picture.

              0_1529185118753_Nozzle Uhr.jpg

              Where do I enter this best.

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              • dc42
                dc42 administrators last edited by

                Are you using that device as a Z probe, or are you setting Z probe type 0 and jogging the head down until you get a certain reading on that device?

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

                  @dc42 said in Mesh Grid Compensation Trial:

                  are you setting Z probe type 0 and jogging the head down until you get a certain reading on that device?

                  Correct Z probe type is 0,
                  and I move manually through the menu until the pointer is at 0.

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                  • dc42
                    dc42 administrators last edited by dc42

                    The probeless probing code assumes that you are going to drop the nozzle until it touches the bed. What might work is to select tool 0, use G10 to temporarily set a tool Z offset of that height, then run the procedure, then set the offset back to zero.

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