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GRBL Error 33

Discussion in 'General Talk' started by RP14, Jul 5, 2023.

  1. RP14

    RP14 New
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    I have searched the forum for the Erroe 33 and found several from few years ago. I have no clue what to do or how to fix this error. Still learning to use my LEAD 1010
    I am using Vectric Desktop and Openbuilds Blackbox.
    Have not had any issues till now. Started on the lettering "BAD TO THE BONE!", when it hits the E is when it stops and gives me the error. I deleted the file and reloaded to the memory stick still same issue.
    Attached pic of error, cannot catch the line file when running.

    What do I need to do to fix this or change?

    Thank You
     

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    #1 RP14, Jul 5, 2023
    Last edited: Jul 5, 2023
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    A screenshot of the error or a log extract would be more helpful to help you from.
     
  3. RP14

    RP14 New
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    How do I get the log extract?

    Just started a new toolpath with just the last letter "E" and exclamaion mark. Still quits on Error 33 Invalid motion target.

    Attached is the file were the error code is, runs for bit then quits.

    Attached the art file I am running using 17"x12" - 1/2" Birch plywood
     

    Attached Files:

    #3 RP14, Jul 5, 2023
    Last edited: Jul 5, 2023
  4. David the swarfer

    David the swarfer OpenBuilds Team
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    The gcode lines are
    G1X14.4114Y2.0046 ;; start of arc
    G2X14.4665Y1.8159I0.0109J-0.0991 ; end of arc

    radius of the arc small (I and J give the offset from the start to the center point, and they are small)
    here is what it looks like when drawn
    upload_2023-7-6_9-51-53.png

    start radius is 0.0997
    end radius is 0.0999
    which is a 0.2% difference, enough to give GRBL fits (it has to calculate the arc that fits the data and it cannot fudge the results by that much).

    as in all the other posts about this you found, the solutions are the same:
    increase resolution in the Gcode output (add 1 or 2 digits to the numbers) (using millimeters may be all it takes)
    linearize small arcs (arc radius < bit radius)
    linearize all arcs​

    are you using the Openbuilds postprocessor for Vcarve? if not then do so, I believe it has alreasdy been tuned to solve this problem.
     
  5. David the swarfer

    David the swarfer OpenBuilds Team
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    btw changing
    G2X14.4665Y1.8159I0.0109J-0.0991
    to
    G2X14.4665Y1.8159I0.0109J-0.0992
    solves the problem and the code will run fine

    (man-spalination : I moved the center 0.0001 closer to the end point, so make the radii more equal)
     
  6. RP14

    RP14 New
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    Thank you for the help. Took me a min to figure out how to get into the G-Code and find the numbers. Ran the last bit and it worked flawlessly.
    For some reason I am off about 1/2" or so as it routed in mid air on 1 section. That's ok, I'll figure out what happened before I finish the rest of the art.
    Again Thanks a Million.
     
    David the swarfer likes this.

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