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    CoreXY: Strange jerk on Y axis.

    Duet Hardware and wiring
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    • ikarisan
      ikarisan last edited by

      On my Hypercube Evolution I am getting strange movements when I am moving the Y axis from Y0 to Y220 and back to Y0.

      https://www.youtube.com/watch?v=fpgu974rDSY

      Can this be a a firmware related problem?
      I can move the axis by hand without any problem.

      Duet WiFi 1.04
      Firmware: 2.03RC1 (2019-05-08b1)
      Duet WiFi Server Version: 1.23

      I used this simple GCODE:
      0_1557699014515_fast_y.gcode

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      • Phaedrux
        Phaedrux Moderator last edited by Phaedrux

        What is the flashing light on your tool head? The probe? Perhaps there is a wire loose and shorting in the cable harness?

        Are you using mesh bed compensation? It looks like you have G29 S1 in your startup gcode. You can see stuttering like that if the Z axis jerk is too low.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • ikarisan
          ikarisan @Phaedrux last edited by

          @phaedrux Yes, the flashing light is a piezo probe. The sensor is very sensitive.
          And yes, I am using mesh bed compensation. I will disable the compensation and try again.

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          • ikarisan
            ikarisan @Phaedrux last edited by

            @phaedrux Okay, these are the result:

            1. Disabling the mesh compensation solves the problem
            2. Reducing the ammount of probe points solves the problem!
              2a) On a 220x220 bed 11 probing points per axis results in the stuttering Y axis.
              2b) If I use only 5 points per axis the movements are smooth
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            • Phaedrux
              Phaedrux Moderator @Phaedrux last edited by

              @ikarisan said in CoreXY: Strange jerk on Y axis.:

              Disabling the mesh compensation solves the problem

              Then this is the problem.

              @phaedrux said in CoreXY: Strange jerk on Y axis.:

              You can see stuttering like that if the Z axis jerk is too low.

              Can you post your config.g?

              Z-Bot CoreXY Build | Thingiverse Profile

              ikarisan 1 Reply Last reply Reply Quote 0
              • ikarisan
                ikarisan @Phaedrux last edited by

                @phaedrux Sure.... 0_1557776986379_config.g

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                • Phaedrux
                  Phaedrux Moderator last edited by

                  Z20.00 E40.00

                  Try increasing your jerk values for Z and E. They are super low. Remember that it's in mm/min. Try at least Z60 and E1000

                  Z-Bot CoreXY Build | Thingiverse Profile

                  ikarisan 1 Reply Last reply Reply Quote 0
                  • ikarisan
                    ikarisan @Phaedrux last edited by

                    @phaedrux I got the E values from: https://zestytechnology.readthedocs.io/en/latest/nimble/tuning.html but I will try your Z values.

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                    • Phaedrux
                      Phaedrux Moderator last edited by

                      Ah I see. In that case leavethee as it is recommended by zesty.

                      Z-Bot CoreXY Build | Thingiverse Profile

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                      • ikarisan
                        ikarisan last edited by

                        It seems that there is a problem with the movement if I configure many probing points.
                        On a 220x220 bed these parameters work fine and the Y axis does not stutter:

                        Xmin: 20, Xmax: 200, Distance: 45

                        But if I use

                        Xmin: 20, Xmax: 200, Distance: 20

                        the movements on Y stutters again.

                        dc42 1 Reply Last reply Reply Quote 0
                        • Phaedrux
                          Phaedrux Moderator last edited by Phaedrux

                          Can you post the images of your heightmap?

                          How fast are you traveling when it does this, and what did you end up changing your Z jerk to?

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • dc42
                            dc42 administrators @ikarisan last edited by

                            @ikarisan said in CoreXY: Strange jerk on Y axis.:

                            It seems that there is a problem with the movement if I configure many probing points.
                            On a 220x220 bed these parameters work fine and the Y axis does not stutter:

                            Xmin: 20, Xmax: 200, Distance: 45

                            But if I use

                            Xmin: 20, Xmax: 200, Distance: 20

                            the movements on Y stutters again.

                            Stuttering when bed compensation is enabled is a result of the Z jerk being set too low to permit the changes in Z speed that are demanded by changes in the height map.

                            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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