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    Tuning different stepper motors.

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    • zBeebleundefined
      zBeeble
      last edited by

      I have two different stepper motors in my setup. Most of this is a fumbling around in the dark following some plans and making everything else up.

      My two z-axis motors are 42BYGHM810P1. Their datasheet says max 2A.

      My other motors (x, y and filament) are 42SHD001-24. The datasheet for this general type say 400mA.

      The default for the duet2-wifi in the setup tool is 1200 mA. This seems to work fine --- the motors get hot (the small ones), but everything seems fine.

      After reading this, tho, I increased my Z motors to 2000 mA and tried reducing the others to 400 mA. That certainly made them run cool --- but also made them quite week.

      Am I reading these values correctly? Should I consider stronger motors so that I'm not over driving them?

      Falkiaundefined deckingmanundefined zaptaundefined 3 Replies Last reply Reply Quote 0
      • Falkiaundefined
        Falkia @zBeeble
        last edited by

        @zbeeble Not knowing how your printer is designed but is it possible to switch the z motors with the x and y?

        Printer: "Deltacus" Delta with 510mm bed diameter and 925mm build height. Powered by Duet 2 WiFi. Duet Smart Effector with E3D Volcano.

        zBeebleundefined 1 Reply Last reply Reply Quote 0
        • deckingmanundefined
          deckingman @zBeeble
          last edited by

          @zbeeble A good rule of thumb is to set the motor current to 85% of their rated current. So running 400mA motors at three times their rated current will certainly make them run hot and will shorten their life span considerably. The Duet documentation has good advice and recommendations https://docs.duet3d.com/en/User_manual/Connecting_hardware/Motors_choosing

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

          1 Reply Last reply Reply Quote 0
          • zBeebleundefined
            zBeeble @Falkia
            last edited by

            @falkia said in Tuning different stepper motors.:

            @zbeeble Not knowing how your printer is designed but is it possible to switch the z motors with the x and y?

            Well... difficult at best. The electronics rest on a board that depends on the extra height of the z-motors. But this doesn't solve the problem ... it just means I'd be looking at the z motors having low current.

            Falkiaundefined droftartsundefined 2 Replies Last reply Reply Quote 0
            • Falkiaundefined
              Falkia @zBeeble
              last edited by Falkia

              @zbeeble it was just an idea because I think the z axis doesn't need so much power to operate comparing to x and y.

              Printer: "Deltacus" Delta with 510mm bed diameter and 925mm build height. Powered by Duet 2 WiFi. Duet Smart Effector with E3D Volcano.

              1 Reply Last reply Reply Quote 0
              • droftartsundefined
                droftarts administrators @zBeeble
                last edited by

                @zbeeble Does your machine have a particularly odd setup? The 42SHD0001-24 motors, looking at the spec sheet here https://www.casunsteppermotor.com/product/42shd0001-24-stepper-engine-1-8-nema-17/ are very high resistance and inductance motors. Usually these are good for high torque, low speed applications, and will generate a lot of back EMF on direction changes. Generally you want faster motors on X and Y. See https://docs.duet3d.com/User_manual/Connecting_hardware/Motors_choosing#inductance for guidance on inductance.

                The 42BYGHM810P1 motors on Z seem reasonable. This is the only datasheet I could find: http://archive.fabacademy.org/2017/fablabverket/students/100/web/assignments/week11/3302_0_Datasheet.pdf

                Ian

                Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

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

                  @zbeeble said in Tuning different stepper motors.:

                  tried reducing the others to 400 mA. That certainly made them run cool --- but also made them quite week.

                  The specs I found for these one says 0.4A, 12V, 30 Ohms, 37mh, which is not good for high speed, unless if you use very high rail voltage.

                  I am not an expert, what they don't seem to be a good fit for 3D printers. What application were they used for?

                  zBeebleundefined 1 Reply Last reply Reply Quote 0
                  • zBeebleundefined
                    zBeeble @droftarts
                    last edited by

                    @droftarts said in Tuning different stepper motors.:

                    @zbeeble Does your machine have a particularly odd setup? The 42SHD0001-24 motors, looking at the spec sheet here https://www.casunsteppermotor.com/product/42shd0001-24-stepper-engine-1-8-nema-17/ are very high resistance and inductance motors. Usually these are good for high torque, low speed applications, and will generate a lot of back EMF on direction changes. Generally you want faster motors on X and Y. See https://docs.duet3d.com/User_manual/Connecting_hardware/Motors_choosing#inductance for guidance on inductance.

                    "Particularly odd" as in I did it all myself in 2014 with only what was on reprap.org at the time as help and/or information? Then yeah.

                    The 42BYGHM810P1 motors on Z seem reasonable. This is the only datasheet I could find: http://archive.fabacademy.org/2017/fablabverket/students/100/web/assignments/week11/3302_0_Datasheet.pdf

                    These motors are "champs" ... but also large. I ordered a pair of 17HS4401S (the non-S was also available... couldn't tell the difference). They say 1.5A max.

                    Now... the feed motor runs "fairly" quickly. I'm assuming I can set the current to 300mA and use the 42SHD0001-24 for that still, fairly safely? My 1mm of movement there is 666 steps.

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

                      @zapta said in Tuning different stepper motors.:

                      @zbeeble said in Tuning different stepper motors.:

                      tried reducing the others to 400 mA. That certainly made them run cool --- but also made them quite week.

                      The specs I found for these one says 0.4A, 12V, 30 Ohms, 37mh, which is not good for high speed, unless if you use very high rail voltage.

                      I am not an expert, what they don't seem to be a good fit for 3D printers. What application were they used for?

                      IDK. Found them on eBay almost 10 years ago.

                      1 Reply Last reply Reply Quote 0
                      • zBeebleundefined
                        zBeeble
                        last edited by

                        I thought it might help to post my m92 line.

                        M92 X100.00 Y100.00 Z5104.00 E666.00

                        ... which all comes from measured movement.

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