AutoCAD - Filleting Parallel Lines

By Martin Phelps

Selecting two parallel lines when using the “Fillet” command will result in a Semi-Circle being placed at the end of the two lines, since the lines are parallel the value of the “Radius” will not affect the resulting “Fillet”. Figure 1 shows 3 examples of filleting parallel “Lines”.

If the lines are different lengths this will influence the positioning of the resulting “Fillet” or semi-circle. The first line selected will retain its original length, the upper line in Figure 2 is longer than the lower line so the lower line will be extended to match the length of the top line.

If the lines are picked in reverse order, the top line will be reduced in length to match the length of the lower line, as per Figure 3.