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CAD tip CAD tip # 9699:

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You can draw a clothoide (Euler spiral, Cornu spiral, Track transition curve) - a smooth transition between an arc and a straight segment using the LISP utility KLOT, see DL Download. Load it with APPLOAD, start the KLOT command and pick the endpoints of an arc and a line. The application will draw the clothoid-transition (red in the picture):

Since release 2024, you can use LISP apps like this also in AutoCAD LT.

Other transition curves can be generated using the road/railway design functions in Autodesk Civil 3D.

ACADADTACLT
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16.2.2014   41947×  
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this tip shared by ARKANCE experts applies to: AutoCAD · AutoCAD Architecture · AutoCAD LT ·

See also:
Tip 14962:How do you connect two offset lines with an ogee curve, double-arc wave?
Tip 14851:Shrinkwrap - boundary curve of DWG drawing polylines.
Tip 14665:Display complex linetypes on 3D curves in plain AutoCAD.
Tip 14630:Extended ASCPOINT - import coordinates from CSV file, including blocks with attributes, GPS coordinates, etc.
Tip 14395:CheckAngles - checking the allowed line angles in the DWG drawing (e.g. only ortho)
Selected tip: How to open DWG files easily using their thumbnail previews?


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