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Fusion 360 4th axis issues

Discussion in 'CAD' started by Levi R, Dec 20, 2023.

  1. Mark Carew

    Mark Carew OpenBuilds Team
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    David the swarfer likes this.
  2. Levi R

    Levi R New
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    Thanks, unfortunately my 4th axis extension ran out right before I could try the file that didn't work so I won't know if that solved my issue till I pay another $200 and I'm broke rn so it might be a while
     
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  3. Jgoyette

    Jgoyette New
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    This video is an understated triumph. I'm still working out the kinks of my 4th axis, but this was a missing link for sure. Perhaps it would be worth consolidating the foundational 4th axis resources in a section of the forum or the manual? Super helpful, thank you for putting this out. In reading some of the other posts and then wrapping my head around viewing the toolpaths I think there might be some confusion on the G53 with a WCS zero in the middle of the part, it makes it look like it will be an expensive failure ;)

    One question that I cannot seem to solve is the visualization in the OB control software, it displays the toolpath as essentially a 3D (XYZ) with no representation of the A-axis. Is this intentional if the y remains zero throughout the operation or am I missing a step between fusion 'machine', 'post' and Control?

    If there is an effort to bring 4th axis posts/resources together I will happily share what posts helped get me through the dark hours. ;)
     
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  4. David the swarfer

    David the swarfer OpenBuilds Team
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    Hi, thanks for your kind comments.

    No, G53 will not cause problems since it is an absolute machine coordinate move.
    G53 G0 Z-10
    moves to 10mm below the Z MCS home 0, which must always be at the top of Z travel.
    The -10 can be edited in the post options 'start and end of job Z position'.

    The work Coordinate 0 (default to G54) is on the center of the chuck.
    The visualization does not yet handle the rotary axis, so it will look very strange, but should cut ok since the controller cuts the Gcode sent to it and the visualization cannot affect that.
    Best is to simulate and check the Gcode in Fusion360 and then carefully test on the machine. I usually just cut some polystyrene foam for testing, cheap and can be cut at absolutely any speed with reasonable success so you don't have to set special feedrates for testing.
     
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