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    Problems with Z axis steppers

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    • yagodajmundefined
      yagodajm
      last edited by

      I am running 12 V.

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

        @yagodajm, IIRC the dual Z plugs connect the steppers in series such that each has in average only 6 volts and once can affect the other. There is some discussion here https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors

        Do you have the spec of the steppers you are using (inductance, resistance, etc)?

        Try to run the experiment at lower speed, if the steppers will behave more reasonably it may be a voltage issue.

        Another experiment is to connect just one motor at a time (install the two jumpers on the board for the other stepper), and see if it works as expected. Again, this will indicate a voltage issue.

        1 Reply Last reply Reply Quote 1
        • yagodajmundefined
          yagodajm
          last edited by

          @zapta said in Problems with Z axis steppers:

          you
          OK, so if I install a 24 v power supply, that means I have to use a 24v hot end and bed,correct? I am thinking this is the way I need to go.

          Karmaundefined 1 Reply Last reply Reply Quote 0
          • yagodajmundefined
            yagodajm
            last edited by

            This is the info on my steppers

            Model: 42SHD0001-24 Step Angle: 1.8° Number Of Phase :2 Insulation Resistance : 100MΩmin.(500V DC) Insulation Class : Class B Rotor Inertia : 38g.cm^2 Mass : 0.2kg Rated Voltage : 12V Rated Current : 0.4A Resistance Per Phase : 30Ω±10% Inductance Per Phase: 37mH±20% Holding Torque : 260mN.m Detent Torque : 12mN.m

            Can I put 24v tonthese ?

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            • zaptaundefined
              zapta
              last edited by

              @yagodajm said in Problems with Z axis steppers:

              12V Rated Current : 0.4A Resistance Per Phase : 30Ω±10%

              This stepper doesn't look as a good fit for 12V system with two steppers in series. You want a lower resistance and higher current stepper (ignore that voltage specification of the stepper, it doesn't matter).

              Let's see if anybody here will come with a recommendation for a stepper.

              1 Reply Last reply Reply Quote 0
              • aidarundefined
                aidar
                last edited by

                Until you get better steppers, you can try to connect second Z motor to E1 (and of corse config it properly), that way they are not connected in series at least.

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                • yagodajmundefined
                  yagodajm
                  last edited by

                  Do you have any recommended steppers to use with the duet maestro?

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                  • yagodajmundefined
                    yagodajm
                    last edited by

                    Do either of these work? I am thinking the first one because of the current rating on the duet maestro.

                    Nema 17 stepper motor with step angle 1.8deg
                    Holding Torque: 45Ncm(63.74oz.in), 12-24 VDC
                    Rated Current/phase: 1.50A & Phase Resistance: 2.3ohms


                    Motor Type: Bipolar Stepper

                    • Step Angle: 1.8 deg.
                    • Holding Torque: 59Ncm(83.6oz.in)
                    • Rated Current/phase: 2.0A
                    • Phase Resistance: 1.4ohms
                    • Inductance: 3.0mH+/-20%(1KHz)

                    If I use these, do I still need to switch power supplies to 24 v ?

                    Thanks,
                    Justin

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

                      @yagodajm, the spec of this 1.4OHM stepper looks much better. Let's see what they expert here say regarding 12V vs 24V.

                      There are stepper motor calculators. E.g. this one.

                      https://www.allaboutcircuits.com/tools/stepper-motor-calculator/

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

                        @zapta
                        I am just worried with the current on the second one. The maestro Max's out at 1.6, I believe it is to much?

                        1 Reply Last reply Reply Quote 1
                        • Phaedruxundefined
                          Phaedrux Moderator
                          last edited by

                          Those motors would be a better fit. The rated current is ok for the maestro as you'd be using 70-85% of rated current.

                          24v is always better choice than 12v if possible, but keep in mind that requires 24v heater and fans (though fans you can use a buck converter to provide 12v).

                          Z-Bot CoreXY Build | Thingiverse Profile

                          Karmaundefined 1 Reply Last reply Reply Quote 0
                          • yagodajmundefined
                            yagodajm
                            last edited by

                            Everyone, thanks for all of your help, I went a head and ordered the

                            Motor Type: Bipolar Stepper

                            Step Angle: 1.8 deg.
                            Holding Torque: 59Ncm(83.6oz.in)
                            Rated Current/phase: 2.0A
                            Phase Resistance: 1.4ohms
                            Inductance: 3.0mH+/-20%(1KHz)

                            At what ma should I run them at, around 1400ma?

                            thanks,
                            Justin

                            1 Reply Last reply Reply Quote 0
                            • Phaedruxundefined
                              Phaedrux Moderator
                              last edited by

                              1000 to 1400, but be sure to actively cool the board with a fan.

                              Z-Bot CoreXY Build | Thingiverse Profile

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                              • yagodajmundefined
                                yagodajm
                                last edited by

                                Got it, thanks for all of you help.

                                1 Reply Last reply Reply Quote 0
                                • Karmaundefined
                                  Karma @yagodajm
                                  last edited by

                                  @yagodajm Partly Correct. It will be explained further down in this message.

                                  The hotend part is a very easy part to replace. To save you some money, you can still use your 12V power supply to only power your 12V heatbed. That's until tou can get another heatbed that is 24V. Then again, some heatbeds are both 12V and 24V. It all depends on how you connect the heatbed. It will say that on the heatbed itself.

                                  There is a way to use your 12V hotend with the 24V system. There is a command that will allow you to limit the amount of voltage to lets say, the hotend, the fans, the heatbed as well.

                                  If you are interested with what I said above, just simple reply to my message.

                                  Karma

                                  Phaedruxundefined 1 Reply Last reply Reply Quote 0
                                  • Phaedruxundefined
                                    Phaedrux Moderator @Karma
                                    last edited by

                                    @Karma said in Problems with Z axis steppers:

                                    There is a way to use your 12V hotend with the 24V system. There is a command that will allow you to limit the amount of voltage to lets say, the hotend, the fans, the heatbed as well.

                                    Using PWM to "limit" the 24v power delivered to a 12v heater is not recommended. PWM means that it's just switching the power on and off very rapidly. So it's still getting 24v sent to a 12v heater, it's just off half the time. In a normal situation this can lead to premature heater failure. In a failure situation where full power is applied this is very dangerous. Not worth saving a few dollars.

                                    Z-Bot CoreXY Build | Thingiverse Profile

                                    Karmaundefined 2 Replies Last reply Reply Quote 1
                                    • Karmaundefined
                                      Karma @Phaedrux
                                      last edited by

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                                      • Karmaundefined
                                        Karma @Phaedrux
                                        last edited by

                                        This post is deleted!
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                                        • Karmaundefined
                                          Karma @Phaedrux
                                          last edited by

                                          @Phaedrux What you said makes perfect sense sir. Please forgive me for doubting you.

                                          This is something that person could use in a pinch, like for a very temporary amount of time.

                                          I personally use the M106 S0.5 command just for my fans. I have a 24V system, I just couldn't find 24V noctua 40mm fan that was 24V. I really love these fans because they are almost silent when they are running. They are also very resilient when it comes to pushing out 24V to a 12V fan. That was when I was still learning the firmware and all. I was a Merlin guy at the start, then jumped to Repetier due to upgrading to a RADDS setup that didn't go anywhere for me. Always had problems with it.

                                          I have a few DC Buck converters laying around here. I am not sure how they will respond to a variable input power. Like if they continue to try and push out 12V when there is only like 7V on the input side. I guess I have some homework to do.

                                          Thanks for the lesson on this. I am very new to this firmware and the Duet3D 2 Wifi board. So far I love it. I wish I would have gotten the Duet3d 3 board. But I know my wife would kill me if I bought that right now.

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