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    Duet3D 1HCL - Closed Loop Controller Beta test

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    • dc42undefined
      dc42 administrators @A Former User
      last edited by

      The first small production run of the EXP1HCL is currently undergoing testing by our assemblers. We should know more on Monday.

      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

      A Former User? 2 Replies Last reply Reply Quote 1
      • A Former User?
        A Former User @dc42
        last edited by

        @dc42
        Sounds great!!!
        Thanks for updating us

        Cheers
        Richard

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        • samlogan87undefined
          samlogan87
          last edited by

          I am keen to get two as well. I have the 48v power supply just need the boards now

          Custom Core-XY

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          • A Former User?
            A Former User @samlogan87
            last edited by

            @samlogan87
            what is the benefit of 48 volt?

            cheers
            richard

            samlogan87undefined 1 Reply Last reply Reply Quote 0
            • samlogan87undefined
              samlogan87 @A Former User
              last edited by

              @gruna-studio you are able to run it much faster

              Custom Core-XY

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              • A Former User?
                A Former User @samlogan87
                last edited by A Former User

                @samlogan87
                really? the motors can drive faster?

                since two years I´m working with 3d printers and duet and I never heard about it. haha

                Is there a good summary from Duet?

                Today is "1HCL-Monday". !!!!

                cheers richard

                dc42undefined 1 Reply Last reply Reply Quote 0
                • dc42undefined
                  dc42 administrators @A Former User
                  last edited by

                  @gruna-studio driving stepper motors at the desired current depends on having enough driver supply voltage to overcome the back EMF of the motors, which increases with speed. It's especially important with high inductance and high current motors. You can estimate the voltage needed using the calculator at https://www.reprapfirmware.org/emf.html.

                  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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                  • A Former User?
                    A Former User @dc42
                    last edited by

                    @dc42
                    ok thanks a lot!

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                    • A Former User?
                      A Former User @dc42
                      last edited by

                      @dc42
                      any good news?

                      😄

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                      • samlogan87undefined
                        samlogan87
                        last edited by

                        @gruna-studio i know. I am hanging out for them. I have money burning a hole in my pocket

                        Custom Core-XY

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                        • A Former User?
                          A Former User @dc42
                          last edited by

                          @dc42
                          Hey any good news?
                          Cheers
                          Richard

                          T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                          • T3P3Tonyundefined
                            T3P3Tony administrators @A Former User
                            last edited by

                            @gruna-studio yes! finally over the bottle neck. drop me a line tony@duet3d.com as you have been waiting a while so we may be able to supply directly from next week (before we can get any to our resellers). also @samlogan87

                            Note support for these is still experimental in RRF 3.4

                            www.duet3d.com

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                            • A Former User?
                              A Former User @T3P3Tony
                              last edited by

                              @t3p3tony

                              yeeeeah!
                              thanks a lot.

                              So there is the first question.
                              Is there any experience with specific encoders I could use?

                              f300a153-a5d4-49da-a5a1-31cdbaf9707d-image.png

                              Is this an actual information?

                              If there is no picture yet, I can provide you some good ones and other documentations.

                              Thanks a lot
                              Richard

                              T3P3Tonyundefined dc42undefined 2 Replies Last reply Reply Quote 0
                              • samlogan87undefined
                                samlogan87
                                last edited by

                                @T3P3Tony awesome. Sent you an email regarding getting some boards

                                Custom Core-XY

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                                • T3P3Tonyundefined
                                  T3P3Tony administrators @A Former User
                                  last edited by

                                  @gruna-studio the SPI connected encoders are not yet fully supported. we have done some limited testing but for now I recommend using quadrature encoders.

                                  www.duet3d.com

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                                  • dc42undefined
                                    dc42 administrators @A Former User
                                    last edited by dc42

                                    @gruna-studio the encoders we have had most success with are the 1000 PPR (4000 CPR) ones built-into some 1.8deg stepper motors. There are some examples at https://www.omc-stepperonline.com/closed-loop-stepper-motor/.

                                    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

                                    A Former User? 1 Reply Last reply Reply Quote 0
                                    • A Former User?
                                      A Former User @dc42
                                      last edited by

                                      @dc42

                                      OK... nice to know. Can´t wait to install it. 🙂

                                      My X-axis works with an double shaft nema 17 who has belts on both ends. So I can´t ( at the moment) install the a new motor. How about the encoder of stepper online. I guess they´re quiet similar to the build in encoder.. or am I completly wrong?
                                      May it´s a cheaper solution to upgrade specific axis.

                                      https://www.omc-stepperonline.com/encoder/

                                      This encoder would fit nicely in my system but I`m not sure if this is working in the same way as the built in encoder of stepper online nemas.

                                      cheers Richard

                                      https://www.omc-stepperonline.com/download/HKT30-32.pdf
                                      56870398-1ff5-41dc-ae6c-101f6e3ee781-image.png

                                      alankilianundefined 1 Reply Last reply Reply Quote 0
                                      • alankilianundefined
                                        alankilian @A Former User
                                        last edited by alankilian

                                        @gruna-studio Can you find some place that verifies you can get a 4,000 counts-per-revolution encoder? I looked at their web page and data sheet and I don't get a solid feeling that's true, but it might be true.

                                        I see CPR and LinesPerRev/PulsesPerRev (LPR/PPR) used incorrectly all the time.

                                        If you can only get a 1000 CPR encoder that's going to be too low a resolution to get you good performance. If the data sheet says CPR but they really mean LPR than it's OK, but without buying and testing one you won't know.

                                        SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

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                                        • A Former User?
                                          A Former User @alankilian
                                          last edited by

                                          @alankilian https://www.rls.si/eng/products/rotary-magnetic-encoders

                                          But I´m no really sure with the configurations there.
                                          Share it if you do one if you want.

                                          I think they have all we need in future.

                                          Concerning the stepper online encoder. I think I´ll ask them and let you know.

                                          Cheers
                                          Richard

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                                          • dc42undefined
                                            dc42 administrators @alankilian
                                            last edited by dc42

                                            @alankilian a 1000 PPR (pulses-per-rev) quadrature encoder provides 4000 CPR (counts per rev, better called transitions per rev). The EXP1HCL board uses all 4000 transitions. The 4 transitions that occur in the time of 1 pulse probably won't be as evenly spaced as the pulses, but using them still provides a benefit over using just the pulse count.

                                            @gruna-studio if the encoder spec is 1000 PPR (not 1000 CPR) then the resolution should be OK. We've only tried one system using a separate encoder (not from stepperonline) and we've had poor results; but that may be caused by something else on that machine. If you do use a separate encoder, you need to make sure there is no added backlash in the encoder caused by it being separate from the motor. So the mounting of the encoder on the shaft and the encoder body on the motor need to be rigid. As long as the EXP1HCL is in beta test and not a fully released product, we'd rather you use stepper motors with integrated encoders, so that we can be fairly sure that any issues you report are not caused by poor coupling of the motor to the encoder.

                                            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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