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X axis stalling mid command

Discussion in 'General Talk' started by TehBIGrat, Sep 22, 2018.

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  1. TehBIGrat

    TehBIGrat Well-Known
    Builder

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    Hi

    Am having a issue with the X axis on my GRBL CNC machine.

    Randomly the X axis stops moving at the end or start of a straight line.

    This only happens when running from gcode. Manually jogging does not cause an issue.

    It's not a slipping servo and I know it's not a skipped command because have of the command is done.
     

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  2. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    change your X max speed to half what it is now, and change the X acceleration to half what it is now.
    if that cures it then you may have had them 'just too fast' or you have some binding in the X travel somewhere. remove the motor pulley and move the carriage by hand and you will probably feel the tight spot.

    I had this with my X, everything could travel ok at 7500mm/min EXCEPT at the far end of X, in the last 6 inches or so it would hesitate.
    now I run it at 3500mm/min and it is always happy.
     
    Mark Carew likes this.
  3. TehBIGrat

    TehBIGrat Well-Known
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    Thanks for the reply. After much mucking around and changing things. We swapped the usb cable, haven't had a problem since. Will keep monitoring it and will try your suggestions next.
     
    David the swarfer likes this.
  4. TehBIGrat

    TehBIGrat Well-Known
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    Further to this problem
    After 3 1.5mm passes this happens
     

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