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Change Workplane Prompt

JacobCheverie
Just had a quick question that I may or may not know the answer to.

Sometimes when I am programming offline to a CAD model, I will try to probe a feature and it will ask if I would like to change the workplane. If I choose no, I get a massively absurd feature. If I choose yes, the workplane changes and things are fine, but other features have the same issue later.

Is this because if I try to probe a circle whose normal vector lies along a plane orthogonal to the current workplane, the software can't "see" the feature? Also, will the measurement results be less precise if I don't choose the perfect workplane for each feature measurement?
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  • Yes, and yes. The circle is calculated parallel to the workplane, so if there's a difference in angle pc-dmis is actually 'seeing' an ellipse. Circles and lines are 2D features, and need to get the direction and third coordinate from something else - for "measured features" it's the current workplane, for "autofeatures" it's the nominal direction, and for "autofeatures with sample points" it's the actual plane measured by the sample points.

    Conclusion: Don't use measured features, use autofeatures with sample points.
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  • Yes, and yes. The circle is calculated parallel to the workplane, so if there's a difference in angle pc-dmis is actually 'seeing' an ellipse. Circles and lines are 2D features, and need to get the direction and third coordinate from something else - for "measured features" it's the current workplane, for "autofeatures" it's the nominal direction, and for "autofeatures with sample points" it's the actual plane measured by the sample points.

    Conclusion: Don't use measured features, use autofeatures with sample points.
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