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Adjusting start position

Discussion in 'CNC Projects' started by OurRidesGarage, Jan 18, 2024.

  1. OurRidesGarage

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    Please bare with me as I'm sure this has been answered and there is a quick fix but I don't understand enough to know if they're having the same issue and what the correct fix is.

    When programming in fusion and sending over the file to openbuildcontrol to cut the job. I get the tool drop down and want to go straight across the stock without raising and starting the cut into the stock.

    I attached a pic of the simulation which shows the move along the z from the start position (green line).

    What is the fix to make start from the top? I know it's a setting or something that's an easy fix. I just can't figure it out.

    Thank you and sorry for another fusion post.
     

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  2. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    if you read the Gcode (it is just text) you will see that the start and end Z moves are at Z max less a little bit, the default is 10mm.
    G53 G0 Z-10
    and that line is preceded by a comment that says (this relies on homing) and a link to this forum where that is explained in detail
    like here Home, Fusion360 and G53 Z moves

    what you are seeing in the previewer is the previewers failure to correctly display the G53 move.
    G53 is a move in Machine Coordinates, which is what homing sets up .
    G54 is relative to the machine coordinates and is where your stock is set with your setZero buttons or probe according to where you set the stock 0,0,0 in he Fusion 'setup'.
     
  3. OurRidesGarage

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    Is the fix to add the stock height to the setup? That's what I'm having a hard time understanding, how to fix it.

    Great explanation, I've tried the following and still nothing.
     

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  4. Misterg

    Misterg Journeyman
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    Definitely not.

    G53 moves rely on the machine being 'homed'. Have you homed your machine? (Not the same as setting X, Y or Z to the workpiece or bed.)

    PS - Unrelated, but it's cheap insurance to start with your tool above the work.
     
  5. OurRidesGarage

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    That's what I'm Trying to do and can't figure out. I don't know why it's not starting above. That's my problem.

    I guess I'm missing the homing part.
     
  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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  7. OurRidesGarage

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    homing wasnt enabled so I had to figure out how to do that and I think after that I got it figured out.

    until the next issue, thank yout!
     
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  8. OurRidesGarage

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    NExt problem.
    When I run job, the z goes up and hits the limiter and a halts the job.
    I noticed the white box that is typically around the part is sitting higher than the part now.
    I'm assuming that is an issue, but I cant figure out how to get it to match.
     
  9. OurRidesGarage

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    Here's the box in the pic
     

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  10. Alex Chambers

    Alex Chambers Master
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    Looking at your earlier pic of the settings in the post processor you have set the start/end position for Z as 20 - that's 20 mm ABOVE the limit switch. It should be -10.

    Alex.
     
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  11. OurRidesGarage

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    That's what it was, I changed so many things to try and fix the previous issue. I forgot to change that one back. THANK YOU
     

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