Extruder "fighting" itself?



  • 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.



  • 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.


  • administrators

    @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.



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


  • administrators

    @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?



  • @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?



  • 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.


  • administrators

    @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.



  • @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?


  • administrators

    @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.



  • @dc42 thank you



  • 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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