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    Help regarding my CoreXY

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    Tuning and tweaking
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    • deckingmanundefined
      deckingman
      last edited by

      So suggest you try upping the current to 2,000 mA. If that doesn't work, try using two separate drivers. I have a single high torque nemA 17 driving 3 screws which runs fine at 1800mA but struggles at 1200. BUT, my lead is only 1mm. As yours is 8mm, then you'll need a lot more torque. TBH, if it were my printer, I'd throw away those 8mm lead screws and use a much finer lead or use gearing to both lower the torque requirement and improve positional accuracy.

      Ian
      https://somei3deas.wordpress.com/
      https://www.youtube.com/@deckingman

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      • dc42undefined
        dc42 administrators
        last edited by

        1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

        2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

        HTH David

        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

        MortarArtundefined 1 Reply Last reply Reply Quote 0
        • selva_tviundefined
          selva_tvi
          last edited by

          @dc42:

          1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

          2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

          HTH David

          I have set acceleration and maximum speed too low. Now Z is moving very slowly.
          Still it is having jerks.
          My motors are rated for 2.5A with 4.8kg torque.
          So, if I give 1600mA current (around 65% of rated current), will it be sufficient to hold Z axis?
          I have another set of motors with 5.5kg torque with 1.5A current rating. Shall I change it?

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          • dc42undefined
            dc42 administrators
            last edited by

            Do the leadscrews move smoothly and easily if you turn them both by hand? Perhaps the Z axis is binding.

            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

            1 Reply Last reply Reply Quote 0
            • selva_tviundefined
              selva_tvi
              last edited by

              Yes. It runs very smoothly without motors. Even after fitted with motors it is moving freely when turned with both hands.
              How to get rid of that binding.?

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              • dc42undefined
                dc42 administrators
                last edited by

                If you are running a Duet 0.6 at 1600mA then the drivers may be overheating. Are you cooling the Duet with a fan? B!owing air along the line of drivers on both sides of the PCB is best. Reducing the current to about 1300mA may improve things if this is the problem.

                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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                • selva_tviundefined
                  selva_tvi
                  last edited by

                  I have provided 60mm dc cooling fan for the duet 0.6 board.
                  It cools both top and bottom layers.

                  I initially started with 1200ma faced the jerk, then increased to 1600ma.

                  For Z binding lubrication will provide solution?

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    If it is moving freely when you turn it by hand, then binding may not be the problem.

                    What is the Z steps/mm in your M92 command?

                    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

                    1 Reply Last reply Reply Quote 0
                    • selva_tviundefined
                      selva_tvi
                      last edited by

                      @dc42:

                      Do the leadscrews move smoothly and easily if you turn them both by hand? Perhaps the Z axis is binding.

                      I hope finally I got some solution. As you said it may be Z axis binding, I googled and found some other forums suggesting to use Lubrication for the smooth rods.

                      I didnt find any non greasy oil, so I used normal vechicle grease for the smooth rods and coconut oil for the lead screw nuts. It worked fine. Immediately, jerk stopped. Now it is running smoothly. Also, slowly increasing the acceleration and max speed for Z axis.

                      Always it is a wonderful thing to get help from this forum. Thanks for everyone who has helped to identify the problem.

                      1 Reply Last reply Reply Quote 0
                      • FrankNPrinterundefined
                        FrankNPrinter
                        last edited by

                        I was just bragging about his awesome support in the folgertech FT5 forum… looks like another duet wifi for an ft5 has been sold LOL Thanks again David, i have been doing tech support for over 30 years and never seen anything like this. Paid through the nose for CISCO TAC and that doesn't even come close to this level. You are Da Man! 🙂

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                        • MortarArtundefined
                          MortarArt @dc42
                          last edited by

                          @dc42 said in Help regarding my CoreXY:

                          1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

                          2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

                          HTH David

                          In the "Configuring RepRap Firmware for Core XY" doc it says:

                          "Important: make sure that you have chosen a right-hand axis system. That is, looking down on the printer the +Y direction should be 90 degrees anticlockwise from the +X direction. If instead it is 90 degrees clockwise, you have a left-hand axis system, which will give you mirror-image prints."

                          But there's no note on this setting. My CoreXY is right handed, and this forum reply was the answer I needed. Maybe the doc could be updated?

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