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    Dual Rigid Coupled Motors

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    • bubblevisor
      bubblevisor last edited by

      I am planning to use 2 steppers on one axis directly coupled via a GT2 belt. I plan to use separate drivers assigned to the same axis on my Duet 3 mini 5+ with expansion board.

      My question is, would there be any issue with the motors or drivers running in this setup? Could the two motors be fighting against one another? I am worried that if the poles/steps are not totally in sync the two motors will be constantly fighting. Anyone tried this before??

      fcwilt T3P3Tony zapta 3 Replies Last reply Reply Quote 0
      • fcwilt
        fcwilt @bubblevisor last edited by

        @bubblevisor

        Nothing unusual about the setup.

        The only thing you want to avoid is the sideways pressure of the belt affecting the alignment of steppers with reference to what they are driving, say lead screws.

        One poster had lead screws connected to the steppers via a flexible couplings.

        The pulleys for the belt were above the flexible couplings pulling them a bit out of alignment.

        If the pulleys were below the flexible couplings all would be fine.

        Frederick

        Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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        • T3P3Tony
          T3P3Tony administrators @bubblevisor last edited by

          @bubblevisor i have heard people using this sort of arrangement when using multiple Z motors, not sure if its actually better than using a single motor and the belt.

          www.duet3d.com

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          • zapta
            zapta @bubblevisor last edited by

            @bubblevisor said in Dual Rigid Coupled Motors:

            I plan to use separate drivers assigned to the same axis on my Duet 3 mini 5+ with expansion board.

            Have you considered connecting the two motors in series to same driver? May be easier to guarantee synced movement.

            bubblevisor 1 Reply Last reply Reply Quote 0
            • bubblevisor
              bubblevisor @zapta last edited by

              @zapta I would have done this if i was using the duet 2 wifi as it has the nice facility of dual z motor (in series) molex kk connections on the board already. However the duet 3 mini does not. Is there an adapter one could purchase to series connect motors to one driver??

              dc42 zapta 2 Replies Last reply Reply Quote 0
              • dc42
                dc42 administrators @bubblevisor last edited by

                @bubblevisor it's easy enough to wire two motors in series.

                2d82869e-caa8-4ea4-8194-502a9ae61ea3-image.png

                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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                • zapta
                  zapta @bubblevisor last edited by zapta

                  @bubblevisor , to build the Y harness in @dc42's post, you can use these connectors which match your existing stepper connectors.

                  https://forum.duet3d.com/topic/23461/anybody-wants-a-stepper-motor-analyzer/122?_=1635001020231 (should land at my Oct 16, 2021, 1:04 PM post there)

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