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Two stepper motors in parallel

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  • undefined
    Dep @zapta
    last edited by 17 Dec 2020, 19:54

    @zapta this configuration does not suit for me, since tube length over 2,5 meters. And there is a need to pull the filament completely out of it.

    1 Reply Last reply Reply Quote 0
    • undefined
      Dep
      last edited by 17 Dec 2020, 20:00

      There is one more question: after assigning two motors to 1 extruder, I found that only one motor is rotating. The second works only if i send the command:

      M567 P0 E1:1; mixing
      

      It seems to me somehow wrong. I see that the M563 command has the L parameter:

       Lnnn Drive to use for filament mapping parameter. By default RRF will use the first and only extruder drive if this parameter is not specified (supported by RRF> = 2.02)
      

      Perhaps this is what I need, but I cannot find information on how to use it.

      Can you clarify this question?

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      • undefined
        Dep @dc42
        last edited by 19 Dec 2020, 12:26

        @dc42 can you tell me about the last question? I cannot find information on this parameter.

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        • undefined
          Dep
          last edited by 23 Dec 2020, 21:31

          In the description of the command "M563: Define or remove a tool" I see the parameter:

          • Lnnn Drive to use for filament mapping. By default RRF will use the first and only extruder drive if this parameter is not specified (supported by RRF> = 2.02)

          I thought this is just for the case when two motors are installed on 1 extruder. I have not found information on this parameter anywhere.

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          • undefined
            Dep @dc42
            last edited by 23 Dec 2020, 21:45

            @dc42 Yes, but the question was:

            can i connect a magnetic filament monitor to one Toolboard 1LC board but control the motor on another board?

            And now I tried to connect the monitor to another board. I receive the following message:

            M591 P3 C "31.io1.in" D0 S0
            Error: M591: Filament monitor port must be on same board as extruder driver
            

            I need to control the motor "31" since motor "21" it is used only for loading and unloading the filament, the current on it is minimal and it skips a little steps because it is impossible to precisely syncronize. But the monitor is connected to the "21" board (because the other board is far away, it is inconvenient to pull the wires there).

            Still, is it possible to connect a monitor to one board and control the motor on another board?

            undefined 1 Reply Last reply 24 Dec 2020, 08:05 Reply Quote 0
            • undefined
              dc42 administrators @Dep
              last edited by 24 Dec 2020, 08:05

              @Dep said in Two stepper motors in parallel:

              Still, is it possible to connect a monitor to one board and control the motor on another board?

              No, that isn't supported. The reason is that when data is received from the filament monitor, the firmware needs to fetch the step position of the extruder motor immediately, in order to compare commanded vs. measured movement.

              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 24 Dec 2020, 17:58 Reply Quote 0
              • undefined
                Dep @dc42
                last edited by 24 Dec 2020, 17:58

                @dc42 Ok thanks David!

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                • undefined
                  maddy
                  last edited by 28 Jan 2021, 03:52

                  @dc42 I want to use 2 Nema 23 high torque motors for the y-axis with Duet 3MB 6HC and 32v power supply. Will the series connection of such motors work with the default drivers of Duet 3? If not, how can I fix 2 motors for y-axis? Do I need any additional board for another motor of y-axis?

                  undefined 1 Reply Last reply 28 Jan 2021, 09:58 Reply Quote 0
                  • undefined
                    dc42 administrators @maddy
                    last edited by 28 Jan 2021, 09:58

                    @maddy said in Two stepper motors in parallel:

                    @dc42 I want to use 2 Nema 23 high torque motors for the y-axis with Duet 3MB 6HC and 32v power supply. Will the series connection of such motors work with the default drivers of Duet 3? If not, how can I fix 2 motors for y-axis? Do I need any additional board for another motor of y-axis?

                    If you connect them in series, then at high speeds that will limit the available torque and increase noise. Better to connect them to separate driver outputs.

                    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 28 Jan 2021, 14:07 Reply Quote 0
                    • undefined
                      maddy @dc42
                      last edited by maddy 28 Jan 2021, 14:07

                      @dc42 said in Two stepper motors in parallel:

                      nect them to separate driver outputs.

                      If I understood properly, I don't need any expansion board for additional drivers. is that right?. My Duet 3 6HC can support 2 motors for y-axis, 1 motor for each x-axis and z-axis, and 1 for the extruder motor. e.g. M584 X0 Y1:2 Z3 E4.
                      Please correct me if that is not right. thank you for your prompt response.

                      undefined 1 Reply Last reply 28 Jan 2021, 14:18 Reply Quote 1
                      • undefined
                        jay_s_uk @maddy
                        last edited by 28 Jan 2021, 14:18

                        @maddy said in Two stepper motors in parallel:

                        @dc42 said in Two stepper motors in parallel:

                        nect them to separate driver outputs.

                        If I understood properly, I don't need any expansion board for additional drivers. is that right?. My Duet 3 6HC can support 2 motors for y-axis, 1 motor for each x-axis and z-axis, and 1 for the extruder motor. e.g. M584 X0 Y1:2 Z3 E4.
                        Please correct me if that is not right. thank you for your prompt response.

                        That's correct

                        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                        undefined 1 Reply Last reply 28 Jan 2021, 14:36 Reply Quote 0
                        • undefined
                          maddy @jay_s_uk
                          last edited by 28 Jan 2021, 14:36

                          @jay_s_uk thank you

                          1 Reply Last reply Reply Quote 0
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