by John Flanagan
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AutoCAD 2025 – Modifying and Editing Polylines
Filleting Polylines
If an object is drawn with a polyline and has several vertices, then a fillet can be applied with a uniform radius value on all of these vertices with a single command. For example, the pentagon in Figure 1 is made with AutoCAD’s polygon command using an inscribed circle of a radius of 85mm. The object type is polyline for this pentagon.
To apply a fillet on all vertices, type “F” on the command line and press “Enter - then type “R” and press “Enter” again. Now enter the value of fillet radius ( in my example 20mm) and then press “Enter.” Now select Polyline from the available options in the command line as shown in Figure 2 below and click on any segment on the pentagon polyline.
Making Smooth Polyline Curves
Look at the contour diagram in Figure 3. In this illustration, you can see that the contour lines in A are made with a polylines, but they have sharp edges at the points where the vertices of the geometry lie. In order to have a clear contour, we need to insure a smooth polyline at the vertices.
To achieve this, type “PE,” then press “Enter” and select “Multiple” from the command line. Now, click on all polyline entities from the drawing area and press “Enter” again. Select “Fit” from the options in the command line and press “Enter” again to exit the command. You will now see that we have smooth curves that join from one end to another with arcs, maintaining a smooth curve form.
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