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Z axis drop when limit switch hit.

Discussion in 'CNC Mills/Routers' started by Adammdp, May 17, 2023.

  1. Adammdp

    Adammdp New
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    What cases my z axis to drop about an inch when a limit switch is tripped.
     
  2. David the swarfer

    David the swarfer OpenBuilds Team
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    set the GRL setting 'step idle delay' to 255
    [03:42:36] [ $$ ] $1=255 ;Step idle delay, milliseconds
    this prevents the motor drivers ever going into standby, in standby they offer no resistance to turning thus allowing the drop
     
  3. Adammdp

    Adammdp New
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    I am having an issue where the z axis plunges several inches upon a fault. I would expect the machine to stop all movement and turn off the spindle. tonight, I had a limit switch falsely trip, the machine was several inches away from the switches on all axis. After the fault, power seems to be lost from the motor and gravity is pulling the z axis down and into the material.
     
  4. Adammdp

    Adammdp New
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    this is set to 255, the result is still the same.
     
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Please post a full Grbl Settings backup from the Grbl Settings tab >×Backup Grbl Settings button
     

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