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Help regarding my CoreXY

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  • undefined
    deckingman
    last edited by 10 Jul 2017, 19:15

    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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    • undefined
      dc42 administrators
      last edited by 10 Jul 2017, 23:02

      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

      undefined 1 Reply Last reply 17 May 2018, 04:30 Reply Quote 0
      • undefined
        selva_tvi
        last edited by 11 Jul 2017, 02:15

        @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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        • undefined
          dc42 administrators
          last edited by 11 Jul 2017, 06:26

          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

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          • undefined
            selva_tvi
            last edited by 11 Jul 2017, 06:34

            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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            • undefined
              dc42 administrators
              last edited by 11 Jul 2017, 07:13

              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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              • undefined
                selva_tvi
                last edited by 11 Jul 2017, 07:22

                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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                • undefined
                  dc42 administrators
                  last edited by 11 Jul 2017, 07:33

                  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

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                  • undefined
                    selva_tvi
                    last edited by 13 Jul 2017, 15:40

                    @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.

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                    • undefined
                      FrankNPrinter
                      last edited by 13 Jul 2017, 18:54

                      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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                      • undefined
                        MortarArt @dc42
                        last edited by 17 May 2018, 04:30

                        @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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