Z axis powering down mid cut

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This topic contains 5 replies, has 2 voices, and was last updated by  Lewis 4 months, 2 weeks ago.

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  • #99214

    Lewis
    Participant

    Hi guys,

    I finished building my MPCNC a few weeks ago and It’s been working awesome! I’m super impressed with it, I’m even helping a friend build another one at the moment.

    I have only had this one issue though.

    I’ve seen people have issues with the Z axis falling down on here before, But I’m having mine fall down mid-cut.

    The Z motor is shutting down and plunging the router into my piece.

    The X and Y motors keep on going, dragging my now overloaded router through the piece.

    It’s only happening on this last job I have been doing, and it’s the biggest thing I have done so far.

    My theory is that because it takes so long to do 1 layer, the Z axis is going into standby.

     

    If anyone knows how to fix this, I would be forever grateful.

    I was supposed to have finished this job by today :/

    Thanks!

    #99216

    Jamie
    Participant

    I don’t think it will power down any of the steppers from inactivity as long as some axes are moving.  Now I’m curious, I will check this.

    It could also be the stepper driver going into thermal shutdown if the current is a bit high and generating slightly more heat than it can dissipate.

    2 users thanked author for this post.
    #99218

    Lewis
    Participant

    I don’t think the Stepper Driver should be overheating, The Z axis is doing literally nothing for a few minutes, stepping down 1mm then going back to doing nothing for ages.

    I’m using the archim board from here btw.

    #99223

    Jamie
    Participant

    The motors and drivers still use the full amount of current even if they are just holding position.  But you are probably right, they are probably not overheating.  You can make sure, next time you run a long-ish job, after a while just feel the drivers and you will get an idea.

    2 users thanked author for this post.
    #99228

    Jamie
    Participant

    And I did check, the Z will not power down until all axes stop moving and then the idle timeout elapses.

    1 user thanked author for this post.
    #99235

    Lewis
    Participant

    Just did the same cuts, but took breaks in between, so I think you might be right about the overheating.

     

    Thanks!

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