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Nema 17 grinds but doesn't rotate

Discussion in 'Motors' started by Tommaso Seresini, Aug 18, 2020.

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  1. Tommaso Seresini

    Tommaso Seresini New
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    Dear all,
    I have set up a 2 axis rig with two paired stepper motors for the Y-axis and an isolated motor for the X-Axis. all of them are driven by the BlackBox Motion control. To move the motors I am using Openbuilds CONTROL software.

    The motors on the Y-axis work fine, but the third one does not: the shaft shakes left and right no matter the desired direction or the velocity, both when on the rail and without being connected to anything.

    I tried to plug the motor using the cables and driver port of the working motors but the result is the same.
    I checked the pins with a multimeter and they coils seem to be intact ( I get a 1st pin with 3rd and 4th with 6th)
    Is there a way to further fix, analyse this issue?

    Thanks a lot
     
    #1 Tommaso Seresini, Aug 18, 2020
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    #2 Peter Van Der Walt, Aug 18, 2020
  3. Tommaso Seresini

    Tommaso Seresini New
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    thanks for the reply.
    I don't think it's miswiring because the other motors work fine and using the wires and ports of the working motor on the 'defective' doesnt help
     
    #3 Tommaso Seresini, Aug 18, 2020
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The symptom is typical of either mismatched/crossed pair wiring, or only 3 or the 4 wires making contact.

    Measurements (ohm) same on both coils you indentified?
     
    #4 Peter Van Der Walt, Aug 18, 2020
    Last edited: Aug 18, 2020
  5. Rob Taylor

    Rob Taylor Master
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    If all else fails and the motor itself still seems to be good, check resistance of +A/-A and +B/-B directly from the driver ports inside the BlackBox. There can be other errors in the path- bad plug terminal crimping, solder joint, whatever. Unlikely to make it through QC, but you never know.
     
    #5 Rob Taylor, Aug 18, 2020
  6. Alex Chambers

    Alex Chambers Master
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    You didn't mention it, so I'll ask - did you test the wiring from the defective motor on the good one?
    Alex.
     
    #6 Alex Chambers, Aug 18, 2020
  7. Tommaso Seresini

    Tommaso Seresini New
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    thank you all for your replies and your interest,
    in the end I had two miswired motors and one (the reversed Y2) correctly wired which lead me to believe that all of the wiring was correct.
    I re-tested the pin with the multimeter and redid the wiring and now it works like a charm.
    beginners mistake, i guess
    thanks
     
    #7 Tommaso Seresini, Aug 18, 2020
    Peter Van Der Walt and Alex Chambers like this.

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