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Seems machine randomly loses its coordinates

Discussion in 'CNC Mills/Routers' started by Chris6406, Apr 9, 2024.

  1. Chris6406

    Chris6406 New
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    Ran the machine for about three hours tonight, lead 1515. Did all the rough pass job everything went fine, on the finish job it got about 20 lines from the end and drove the bit down through the piece and I don’t know why. it was headed in the right X axis direction, but the bit dove down about 2 inches, like it, lost its Z orientation. It looked good in fusion when I ran the simulation. Look good in the open builds software when I ran the simulation. still ruined about three hours worth of work. Any ideas?
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Loose setscrew on Z axis coupler? Loose terminal causing intermittent loss of motor power one of the 4 wires? Z Max Rate / Acceleration set a little too high?
     
  3. Chris6406

    Chris6406 New
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    Screws good, accelerations stock. I’ll check the wiring in the morning.

    I will say this, The move before, on the lead out, it stopped and hovered in place for a second before it made the move that killed my piece. don’t know if that’s indicative of anything or not.
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Let's add EMI to the list, logs would have been helpful to confirm: docs:blackbox-x32:faq-emi [OpenBuilds Documentation]
     
    David the swarfer likes this.
  5. Chris6406

    Chris6406 New
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    I have the X4 box, I wasn’t aware you could pull logs from it. i’m leaning towards EMI, or possibly some sort of power fluctuation. we had storms rolled in while I was running that job.
    Going to run that job again on the same piece, I can’t mess it up :) I’ll see what happens.
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    upload_2024-4-9_20-20-37.png
     
  7. Chris6406

    Chris6406 New
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    Duhhh.
    Thanks Pete.
    Headed to shop now. I'll keep you posted.
     
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  8. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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  9. Chris6406

    Chris6406 New
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    Thanks for the help
    I ran the job again on the piece I ruined. It ran fine.
    I’m thinking I had a power flicker mid job.
    I reckon I need to watch the radar before I fire up the machine.

    also running black box X4 on a queenant prov2. Using heavy gauge extrusion reinforced with half-inch 6061 by 3 inch reinforcement plates, on the x and y. Then the whole machine is attached to a welded square tube table top.

    very stiff, negligible flex,+\-.0003”

    are there any limitations on the black box I need to be aware of as far as increasing acceleration and feed. I’ve increased both slightly running with a 2.2 KW spindle. I’ve had very good results at 80 to 100 inches per minute so far, depending on the material.

    appreciate it Pete.
     
    #9 Chris6406, Apr 9, 2024
    Last edited: Apr 9, 2024
  10. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Not really. Tune acceleration / max rate as described in the Grbl Wiki
     

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