How to Fillet Corners of Rectangles in AutoCAD

Straight lines are default in AutoCAD, since most mechanical and architectural drawings require straight edges. Still, if you need to create a fillet or curved edge, AutoCAD offers a specific command that allows you to control the radius of a fillet. The command also allows automatically remembers your settings to repeat the command when necessary. By creating a rectangle first, it's simple work to curve the edges for a more elegant drawing.

Step

Draw a rectangle with a rectangle tool by selecting the rectangle icon from the home tab. Click anywhere on the template and then specify the opposite corner to insert the rectangle.

Step

Click the "Fillet" button, depicted as a rounded corner above the Home tab's "Modify" panel.

Step

Type "R" into the command line to specify the radius, then press "Enter."

Step

Type the radius of the fillet, including unit of measure. For instance, for a radius of 10 inches, you'd type 10" without spacing. Press "Enter."

Step

Click directly on one of the lines of the rectangle and then select the line perpendicular to the first. The fillet will automatically appear. Repeat the action by clicking the fillet icon once more, then clicking two perpendicular lines. Your settings from the first fillet will still apply. To create new settings, repeat the process and enter a new radius.