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    Problem with calibrating axis

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    • thomasthetrainundefined
      thomasthetrain
      last edited by

      hello
      Im trying to calibrat my printers step/mm, I dont have any problem with Z and X. But Y is a hot mes it's either over or under the value i set.
      As you can see when i changes the steps the printed dimention stays relatively stabel until a serten piont ( im calibrating the 80 mm value).
      Any suggestions ?
      Grateful for all the help I can get.
      bd22fcb7-7c20-40c2-8437-07dac4746fb5-image.png

      dont know how helpfull this graph is but 😃
      Data.png

      and hear is my config
      0947d01a-e5a1-409c-bdd6-8a41454cc753-image.png

      fcwiltundefined 1 Reply Last reply Reply Quote 0
      • fcwiltundefined
        fcwilt @thomasthetrain
        last edited by

        @thomasthetrain

        Hi,

        Interesting stuff.

        Why should you be needing other than whole numbers for your steps/mm values. The hardware dictates what the value should be. What kind of hardware do you have?

        Thanks.

        Frederick

        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

        thomasthetrainundefined 1 Reply Last reply Reply Quote 0
        • thomasthetrainundefined
          thomasthetrain @fcwilt
          last edited by

          @fcwilt I have a JGaurora 5s printer moded with a duet2 wifi and a Hemera extruder. The XYZ motors are the 1,8 deg variant.

          fcwiltundefined 1 Reply Last reply Reply Quote 0
          • fcwiltundefined
            fcwilt @thomasthetrain
            last edited by

            @thomasthetrain said in Problem with calibrating axis:

            @fcwilt I have a JGaurora 5s printer moded with a duet2 wifi and a Hemera extruder. The XYZ motors are the 1,8 deg variant.

            Well doing the math the correct steps/mm values should be:

            X = 80
            Y = 80
            Z = 800
            E = 400

            I need to double check that E value but I think it is right.

            You can use command M579 to tweak the sizes of things - try using that and see how it works.

            Frederick

            Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

            thomasthetrainundefined 1 Reply Last reply Reply Quote 0
            • thomasthetrainundefined
              thomasthetrain @fcwilt
              last edited by

              @fcwilt I'll give this a try 👍

              thomasthetrainundefined 1 Reply Last reply Reply Quote 0
              • thomasthetrainundefined
                thomasthetrain @thomasthetrain
                last edited by

                @thomasthetrain
                I've printed with M579 and this is the result, now the 80 mm is perfect but still not the rest.
                3910bdb2-326c-487e-9335-e1c054e09c62-image.png

                thanks for the tip but because the differens in dimentions is not linear i can't apply M579, ( I Think )

                fcwiltundefined 1 Reply Last reply Reply Quote 0
                • fcwiltundefined
                  fcwilt @thomasthetrain
                  last edited by

                  @thomasthetrain said in Problem with calibrating axis:

                  @thomasthetrain
                  I've printed with M579 and this is the result, now the 80 mm is perfect but still not the rest.
                  3910bdb2-326c-487e-9335-e1c054e09c62-image.png

                  thanks for the tip but because the differens in dimentions is not linear i can't apply M579, ( I Think )

                  Well if it is non-linear that would lead me to suspect a hardware problem.

                  Those steps/mm numbers are correct so it must be something else.

                  You have the stepper currents set to 800. The would be appropriate if the steppers were spec'd at a max of 1000. Which doesn't seem likely.

                  Try upping the current to a max of 80% of the stepper rating. Maybe the steppers are just missing a micro-step here and there.

                  And the max speed setting of 180,000 seems rather high - that works out to 3000 mm/sec

                  Oh yes, one other thing - always put the M92 command before the M350 command and be sure the M92 command aris correct for X16 micro-stepping.

                  If you do that you can then change the settings in the M350 and the firmware will do the appropriate calculations for adjusting the steps/mm.

                  Frederick

                  Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

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