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CAD tip # 12282:

Question CAD
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How to dimension radius and center of a spline in a given point?

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

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22.6.2019 1565×

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Civil 3D

AEC Collection

applies to: AutoCAD · Civil 3D ·

See also:
Tip 9038:	Double helix - twisted pair in Inventor
Tip 8962:	Project 2D curve to a 3D sphere.
Tip 7439:	Extended FILLET functionality.
Tip 7005:	Total length of lines in a drawing (by layer) - AddLen

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