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CAD tip CAD tip # 12091:

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The standard offset to an ellipse creates a spline or 2D polyline. As an offset curve to a spline does not make a true mathematical elliptical curve. Dependent on the type of the ellipse (ellipse or 2D polyline, see PELLIPSE), the command OFFSET creates either an offset curve of the type Spline or again a 2D polyline.

If you want to create an "equidistant" ellipse, you will need a different way. First create an auxiliar geometry in the ellipse quadrant points - e.g. perpendicular lines of the same length as the requested offset and then use grip editing to move the quadrant nodes to a new position with the help of osnaps (_QUA, _END).

Compare the yellow ellipses and orange polylines and the type of their offsets:

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18.12.2018    19371×  
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applies to: AutoCAD · AutoCAD LT · Civil 3D ·

See also:
Tip 10039:Two types of equidistants (offsets) to an ellipse.
Tip 7800:How to model a 3D hyperboloid?
Tip 6388:How to convert an Ellipse to a Spline?
Tip 6216:Array along a path.
Tip 6016:Writing text along a curve in AutoCAD.
Selected tip: How to export a STL file from Mechanical Desktop?


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