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    Using Duet 3Mainboard with external stepper drivers

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    • jhonf441undefined
      jhonf441 @mpentenr
      last edited by

      @mpentenr Hello, I am currently working on something similar with Duet2, I would like to know more about your work in this regard, I can share what I have.

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      • FBGundefined
        FBG
        last edited by

        Hi,

        one of the best things of the Duet2 is than is the best board working with external stepper drivers.
        In my opinion (and in my case) the next Duet3 (expansion or special board) never can have LESS external connections than the actual Duet2, the same number or more.

        Now have for 5 connections (if i don't remember wrong)...

        Thanks

        T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
        • T3P3Tonyundefined
          T3P3Tony administrators @FBG
          last edited by

          @fbg you can add a lot of expansion boards. If we decide to put 3 external driver connections on each then potentially up to 8 of those expansion boards = 24 drivers!

          www.duet3d.com

          FBGundefined 1 Reply Last reply Reply Quote 0
          • FBGundefined
            FBG @T3P3Tony
            last edited by

            @t3p3tony No words.... incredible

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            • mpentenrundefined
              mpentenr @dc42
              last edited by

              @dc42 Are there any news on this topic ?

              dc42undefined 1 Reply Last reply Reply Quote 0
              • dc42undefined
                dc42 administrators @mpentenr
                last edited by dc42

                @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                @dc42 Are there any news on this topic ?

                Not yet. Now that we have the prototype Tool Board, there are two ways we could support external drivers without needing a new main board:

                1. Do a version of the EXP3HC board with outputs for 3 or just possibly 4 external stepper drivers instead of on-board drivers. This would probably be best for those who are actually using external drivers, not step-servo motors. But we don't expect many people to need external drivers with Duet 3.

                2. Do a version of the Tool Board that has a single set of step/dir/enable outputs, to drive a single external driver or step-servo drive. I think this might be better for those using step-servo motors with built-in controllers.

                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

                mpentenrundefined 1 Reply Last reply Reply Quote 0
                • mpentenrundefined
                  mpentenr @dc42
                  last edited by

                  @dc42 said in Using Duet 3Mainboard with external stepper drivers:

                  @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                  @dc42 Are there any news on this topic ?

                  Not yet. Now that we have the prototype Tool Board, there are two ways we could support external drivers without needing a new main board:

                  1. Do a version of the EXP3HC board with outputs for 3 or just possibly 4 external stepper drivers instead of on-board drivers. This would probably be best for those who are actually using external drivers, not step-servo motors. But we don't expect many people to need external drivers with Duet 3.

                  That would be my favorite, because of my 2pt100(bed) and 3K-Type Thermocouple (Pellet Extruder) which I cant connect to the tool board or is it possible to use thermo connectors on one board and step/dir/ena on another board for one "axis/extruder"? I also would need 2 of these boards, because of the 3 (X/Y/Z)axis with external drivers and up to 3 external drivers for the (pellet)extruders.

                  1. Do a version of the Tool Board that has a single set of step/dir/enable outputs, to drive a single external driver or step-servo drive. I think this might be better for those using step-servo motors with built-in controllers.

                  Please take into account, that the Vin for example for my pellet extruder is 48V, when designing the driverless Tool Board with step/dir/ena output.

                  Thanks
                  Marc Pentenrieder

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    @mpentenr, what motors and drivers do you plan to use on that machine? Although we don't support as much as 48V at present, we are considering making variations of main and/or expansion boards that support up to about 54V. The TMC5160 drivers can take 60V, it's just the voltage regulators we use that limit us to around 35V.

                    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

                    mpentenrundefined 1 Reply Last reply Reply Quote 0
                    • mpentenrundefined
                      mpentenr @dc42
                      last edited by

                      @dc42 Hi, on the 3 axis I am using 1KW 380V Servo Motors and on the pellet extruder, I am using the following:
                      Motor Driver: https://us.nanotec.com/products/1768-c5-e-2-09-motor-controllerdrive-for-canopen-or-usb/

                      Stepper motor: https://us.nanotec.com/products/574-st8918m6708-a/

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                      • dc42undefined
                        dc42 administrators
                        last edited by dc42

                        Thanks. Are you using the encoder input on the stepper driver for the pellet extruder? What is the maximum rotation speed needed by the pellet extruder motor? Have you established that you really do need 48V to drive it?

                        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

                        mpentenrundefined 1 Reply Last reply Reply Quote 0
                        • mpentenrundefined
                          mpentenr @dc42
                          last edited by mpentenr

                          @dc42 said in Using Duet 3Mainboard with external stepper drivers:

                          Thanks. Are you using the encoder input on the stepper driver for the pellet extruder? What is the maximum rotation speed needed by the pellet extruder motor?

                          No, I am not using the encoder input (at the moment, perhaps I need to).
                          The max rotational speed will be around 500 rpm, because of an 10:1 gearbox on the stepper, so up to 50 rpm at the pelletextruderspindle

                          mpentenrundefined 1 Reply Last reply Reply Quote 0
                          • mpentenrundefined
                            mpentenr @mpentenr
                            last edited by mpentenr

                            @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                            @dc42 said in Using Duet 3Mainboard with external stepper drivers:

                            Thanks. Are you using the encoder input on the stepper driver for the pellet extruder? What is the maximum rotation speed needed by the pellet extruder motor?

                            No, I am not using the encoder input (at the moment, perhaps I need to).
                            The max rotational speed will be arounf 500 rpm, because of an 10:1 gearbox on the stepper, so up to 50 rpm at the pelletextruderspindle

                            At the moment the pellet extruder is highly experimental, so I don't know the exact values. Time and experiments will show 😉

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                            • mpentenrundefined
                              mpentenr
                              last edited by

                              @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                              @dc42 Are there any news on this topic ?

                              Hi dc42, are there any news on driverless duet3 or addon boards for driving motors with external drivers ?!

                              dc42undefined 1 Reply Last reply Reply Quote 0
                              • dc42undefined
                                dc42 administrators @mpentenr
                                last edited by

                                @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                                @mpentenr said in Using Duet 3Mainboard with external stepper drivers:

                                @dc42 Are there any news on this topic ?
                                

                                Hi dc42, are there any news on driverless duet3 or addon boards for driving motors with external drivers ?!

                                We have a few tool board prototypes modified to drive a single external driver at 5V signals levels. We will turn this into a production item. We still need to lay it out on a PCB, but that shouldn't take long, because the design is based on our Tool Board.

                                We haven't yet made a decision on whether to make a driverless version of the main board.

                                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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                                • Kyle_55undefined
                                  Kyle_55
                                  last edited by

                                  DC42,
                                  I would be interested in a driver-less version as well. Don't get me wrong, those 5160's are nice but I already have $200 invested in my hobby CNC's external drivers and when / if I make the switch from the UC100 to the Duet , I will also be getting a Duet wifi for my 3d printer. The thought of spending $400 + on the upgrade while shelving $400 in parts with no use is a real bummer. And I get that an $800 hit is nothing for most, but for a guy just trying to learn a new hobby....

                                  Kyle

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                                  • wi10008undefined
                                    wi10008
                                    last edited by wi10008

                                    Hi @dc42,

                                    I'm interested in triggering camera exposures that synchronise with the X/Y axis motors. My camera has a 5V logic trigger input. Would the driverless Tool Board work to drive the camera as if it were an extuder?

                                    I'd like to use the steps/mm setting as "exposures"/mm.

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                                    • Danalundefined
                                      Danal
                                      last edited by

                                      Yes.

                                      But you can do this today. There are plenty of IO ports with outputs. These are 3.3V, but 3.3 V out to 5 V in logic almost always works.

                                      You then trigger the camera with M42

                                      Delta / Kossel printer fanatic

                                      dc42undefined 1 Reply Last reply Reply Quote 0
                                      • dc42undefined
                                        dc42 administrators @Danal
                                        last edited by

                                        @Danal said in Using Duet 3Mainboard with external stepper drivers:

                                        Yes.

                                        But you can do this today. There are plenty of IO ports with outputs. These are 3.3V, but 3.3 V out to 5 V in logic almost always works.

                                        You then trigger the camera with M42

                                        On the v1.0 Duet 3 main boards there is also the output marked Laser/VFD, which is 5V.

                                        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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                                        • FBGundefined
                                          FBG
                                          last edited by

                                          Any news about this?
                                          For the moment there are not possibility of connect a external stepper/servo driver?

                                          It is the only thing that blocks me from buying Duet3, and I must continue buying Duet2 with expansion board.

                                          And the Duet3 have important things that i want start to approach immediately.

                                          Best Regards

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                                          • alil2096undefined
                                            alil2096
                                            last edited by

                                            Good orning, any news for this expansion board?

                                            Because I use the duet 2 wifi for 2 external motor..

                                            if even the duet 3 had the possibility to connect I would buy it immediately!

                                            Thanks,

                                            Andrea

                                            www.lillia.net

                                            Facebook page

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