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    By Martin Phelps

    When the “Fillet” command is used with “Polylines”, there can be several outcomes. A sample closed “Polyline” with dimensions is shown in Figure 1.

    AutoCAD_-_Using_Fillet_with_Polylines_-_1.JPG

    Once a “Fillet” radius has been set, in this case the radius has been set to a value of 20, two adjoining lines that comprise the “Polyline” can be selected. Just as if they were standard lines this will place a “Fillet” between the two “Polylines” as shown in Figure 2.

    AutoCAD_-_Using_Fillet_with_Polylines_-_2.JPG

    This does mean that using this method, “Fillets” of various values could be applied to the “Polyline”, as shown in Figure 3.

    AutoCAD_-_Using_Fillet_with_Polylines_-_3.JPG

    The alternative option would be to use the “Polyline” Sub command, this can be accessed from the “Command Line”, “Right Click Menu” or typing “P + Enter”. This will add the specified “Fillet” to all sections of the “Polyline” as shown in Figure 4.

    AutoCAD_-_Using_Fillet_with_Polylines_-_4.JPG

    The “Fillets” are now part of the “Polyline”. If the “Fillet Radius” is changed, for example to 10 and the “Polyline” is re-selected, it will update all the predefined “Fillets” with the new “Radius” value as shown in Figure 5.

    AutoCAD_-_Using_Fillet_with_Polylines_-_5.JPG

    When the “Polyline” segment is too short for the set “Radius” the “Fillet” will not added, as shown in Figure 6.

    AutoCAD_-_Using_Fillet_with_Polylines_-_6.JPG

    With the “No Trim” option set in the “Fillet” command, the “Fillets” will become separate “Arcs”, and the “Polyline” remains one object as shown in Figure 7.

    AutoCAD_-_Using_Fillet_with_Polylines_-_7.JPG