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.

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22.6.2019 22772×

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Civil 3D

AEC Collection

applies to: AutoCAD · Civil 3D ·

See also:
Tip 13864:	Displaying the curvature comb or radii of a general curve - CurvComb.
Tip 13221:	Attractor - snap multiple objects to existing points/vertices.
Tip 13183:	Lin2Cyl - bulk conversion of lines to 3D cylinders.
Tip 13040:	iLogic - display information about complexity of an Inventor part.
Tip 12479:	PkLength - export line lenghts to Excel.

Selected tip: How to get World coordinates from the ID command?

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