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CAD tip # 12282:
Question
A
AutoCAD cannot directly dimension a local radius of a spline curve. But you can use the following steps:
- First explode the curve to arc segments with the command FLATTEN from Express Tools.
- Now run the Dimension tool and hover on a given point on the curve to display (or draw) a local radius and and center point.
See the video:
If you need a better precision than in FLATTEN, set the variable PLINECONVERTMODE to 1, run the command SPLINEDIT with the option _Poly and specify the precision of the conversion - spline to arc segments.
In the case of spline alignments in Civil 3D you can also use the interactive command "Alignment curvature" (csct_SpiralDyn) from the add-on CADstudio Civil Tools.
ACADCivil


22.6.2019
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