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  • Dec 3, 2025, 7:49 PM

    Thank you very much for your ideas and proposals! The final solution was proposed by Shalmeneser in the FreeCAD forum.

    The #FreeCAD forum is just amazing!

    First reply after 40 minutes - reply with the solution I'm going to adapt after 59 minutes. Shalmeneser nailed it using a DatumLine and a DatumPlane. If you're interested, I've asked some nerdy detail questions in the forum 🤓

    My example showing the proposed solution from Shalmeneser is attached.

    Cc @NUeB @rrmutt @chrishuck

    FreeCAD Screenshot. Showing a part of a frame with a rounded corner. Inside the rounded corner is an odly shaped "area". A DatumLine and DatumPlane are visible. These were used to form the 45 degree chamfer at the bottom of the odly shaped area.
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  • Dec 3, 2025, 3:06 AM

    @M4x Can you do a revolved cut of your triangular profile with the center of rotation being an axis that passes through the center of your outer corner radius? Or do you want a straight chamfer? If so, I would do a symmetric extruded cut of your profile.

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  • Dec 3, 2025, 6:14 AM

    @M4x It’s crude, but I often use a subtractive box: just angle it and position it to plane off what you need

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