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    Z Axis 2 Parallel Motors Synchronization

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    • jaydevdaveundefined
      jaydevdave
      last edited by

      Even on no-load condition, the two Z motors are not able to generate sufficient torque. Rated current being 1.5A with a torque of 5.5kg/cm2 and using 24V supply. What could be the reason for it? And what could be the solution for the same? Should I increase supply voltage or should use Motors with higher rated current?
      Please find the link to the video wherein no-load condition the z motors are not generating proper torque.

      https://drive.google.com/open?id=1I50zJb8WMD2IF8rmksil2842Gv6Ds2Q4

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      • deckingmanundefined
        deckingman
        last edited by

        No doubt David will be along soon but from that video I'd say there has to be something wrong with either one of the motors or the wiring.

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

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        • jaydevdaveundefined
          jaydevdave
          last edited by

          The same motors run when connected on X and Y axis respectively and that too with high speed of 100mm per second.

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          • dc42undefined
            dc42 administrators
            last edited by

            @jaydevdave:

            What is the maximum speed at which my printer can run, having stepper motors (1.5A current), torque 5.5kg/cm2 and using external power supply 24V?

            See the link that I posted in my previous reply for how to calculate this.

            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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            • dc42undefined
              dc42 administrators
              last edited by

              @jaydevdave:

              Duet's X Y Z Motor Drivers and its capacity is same or different ?

              All the same.

              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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              • jaydevdaveundefined
                jaydevdave
                last edited by

                The same motors run when connected on X and Y axis respectively and that too with high speed of 100mm per second. why so?

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  @jaydevdave:

                  The same motors run when connected on X and Y axis respectively and that too with high speed of 100mm per second.

                  The maximum speed achievable is lower when you have two motors wired in series. But why are you trying to run your Z axis at 100mm/sec? Z doesn't need to move fast.

                  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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                  • jaydevdaveundefined
                    jaydevdave
                    last edited by

                    We having two Y motors which have been swapped with the Z axis. So Two Y motors being connected at the Z axis and we need the speed of 100mm/sec.
                    Stepper motors Rating 1.5A
                    Power supply 24V.
                    How can it be achieved?

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                    • dc42undefined
                      dc42 administrators
                      last edited by

                      Try connecting them in parallel to just 1 of the connectors instead of in series using both connectors, and setting the current to 2A.

                      EDIT: alternatively, if you have any spare motor driver outputs left, connect them to separate outputs, use M584 to tell the firmware to drive both together, and use the existing current setting.

                      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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                      • jaydevdaveundefined
                        jaydevdave
                        last edited by

                        Driving both the motors from a single connection(parallel) instead of two is safe? I hope it won't burn out the driver right?

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                        • jaydevdaveundefined
                          jaydevdave
                          last edited by

                          We having two Y motors which have been swapped with the Z axis. So Two Y motors being connected at the Z axis and we need the speed of 100mm/sec.
                          Tried what dc42 mentioned in the previous comments. We do not have extra driver nor it is working in parallel connection.
                          Should we increase the power supply or should I use 3A rated stepper motors?

                          Current motor having rating of 1.5A
                          Torque 5.5kg/cm2
                          Power supply 24V.

                          How to do it?

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                          • dc42undefined
                            dc42 administrators
                            last edited by

                            Like I said, connect them in parallel to a single stepper motor output, and try 2A current. The drivers are current-limited so it is safe.

                            What is the steps/mm for that axis?

                            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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                            • jaydevdaveundefined
                              jaydevdave
                              last edited by

                              Alright

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                              • jaydevdaveundefined
                                jaydevdave
                                last edited by

                                Can we set motor current to 3A in config ?

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                                • elmoretundefined
                                  elmoret
                                  last edited by

                                  @jaydevdave:

                                  Can we set motor current to 3A in config ?

                                  Have you read the documentation?

                                  https://www.duet3d.com/wiki/Choosing_stepper_motors

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