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    Extruder "fighting" itself?

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    • mlbuxbaum
      mlbuxbaum last edited by

      My extruder stepper seems to be fighting itself (grinding and not turning) I have the stepper wired directly to the DUET board and double checked that I have each coil wired together, and that i have those coils wired to the black & green (coil1) and the red & blue(coil2) respectively. Any idea what my issue could be, I am thinking it is a firmware issue.

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      • mlbuxbaum
        mlbuxbaum last edited by

        just checked impedance on the stepper while still connected to the DUET. Coil 1 reads .887MΩ and coil 2 reads 1.2Ω. Think my driver is bad? I checked the stepper motor and both measure the same impedance.

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

          @mlbuxbaum said in Extruder "fighting" itself?:

          just checked impedance on the stepper while still connected to the DUET. Coil 1 reads .887MΩ and coil 2 reads 1.2Ω. Think my driver is bad? I checked the stepper motor and both measure the same impedance.

          If coil 1 read .887Mohms than you have an intermittent connection between wherever you touched your multimeter probes and the stepper motor coil.

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          • mlbuxbaum
            mlbuxbaum last edited by

            hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

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

              @mlbuxbaum said in Extruder "fighting" itself?:

              hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

              Unlikely unless you have set the acceleration or speed much too high. It sounds like a bad connection, faulty motor or a blown driver. Your reading of .887Mohms definitely means you had a bad connection or a faulty motor at that point. Can you test the driver by connecting a different motor to it, using a different cable?

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

                @dc42 said in Extruder "fighting" itself?:

                @mlbuxbaum said in Extruder "fighting" itself?:

                hooked wires up directly, bypassing terminal block connector and still getting the "fighting" Could this be a firmware issue?

                Unlikely unless you have set the acceleration or speed much too high. It sounds like a bad connection, faulty motor or a blown driver. Your reading of .887Mohms definitely means you had a bad connection or a faulty motor at that point. Can you test the driver by connecting a different motor to it, using a different cable?

                I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

                dc42 1 Reply Last reply Reply Quote 0
                • gen2eng
                  gen2eng last edited by

                  For what it's worth, I've seen two pancake steppers from a well known extruder manufacturer fail.

                  One was a short like dc42 is suggesting and the other had weak/failed permanent magnets in the rotor. Running a stepper too hot can cause both failures.

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                  • dc42
                    dc42 administrators @mlbuxbaum last edited by

                    @mlbuxbaum said in Extruder "fighting" itself?:

                    I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

                    Look up M584 in the GCode wiki page.

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                    • mlbuxbaum
                      mlbuxbaum @dc42 last edited by

                      @dc42 said in Extruder "fighting" itself?:

                      @mlbuxbaum said in Extruder "fighting" itself?:

                      I have the wires directly connected together, and it was working prior to yesterday when I uploaded firmware again. I have also tried 3 separate steppers. Can I use extruder 2 to test? How do I activate that driver and set it up in firmware?

                      Look up M584 in the GCode wiki page.

                      That didnt help much.... anyway.
                      How is the duet output color codes? green/black=coil 1 and red/blue=coil 2?

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                      • dc42
                        dc42 administrators last edited by

                        @mlbuxbaum said in Extruder "fighting" itself?:

                        How is the duet output color codes? green/black=coil 1 and red/blue=coil 2?

                        That's the normal arrangement for stepper motors, where the wires come straight out of a motor and not via a plug and socket. At the Duet, if you number the connector pins 1234 in order, one coil goes to 1-2 and the other coil goes to 3-4.

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

                          @dc42 thank you

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                          • mlbuxbaum
                            mlbuxbaum last edited by

                            Well, dont I feel like a real idiot.........The red wire on the E0 connector that plugs into the Duet was broken inside the connector. I found when I was moving the connector to E1.....

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