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       You can create a fillet using FILLIT command. This command can apply to the objects such as arcs, circles, ellipses, lines, polylines, radials, splines or construction lines as well as 3D solids. A fillet is an arc that connects two objects smoothly and has a specified radius. An inside corner is called a fillet; an outside corner is called a round.

To fillet two objects

1.   Choose Modify > Fillet.

2.   On the command line, type s.

3.   In the Drawing Settings dialog box, specify the fillet radius.

4.    Click OK.

5.   Select the first object.

6.   Select the second object.

Modify toolbar

Command line FILLET

        Using FILLET command can help you create an arc that is tangent to the selected objects easily. You can also use Polyline option to create fillets for each corners of a polyline.

        When the objects to fillet are on the same layer, the fillet arc is created on that layer; otherwise, the fillet arc is created on the current layer that affects the properties of objects such as color and linetype. The Multiple option can create fillets for more than one set of objects until you exit the command.

Set the Fillet Radius

        You can specify the radius of a fillet arc connecting two objects. The latest value is always the current radius value. This setting is only available when you create a new fillet arc. When the radius is set to 0, the objects to fillet are trim or extend to get intersecting, but not create a fillet arc.

Trim and Extend Filleted Objects

       While performing fillet, you can select Trim option to decide whether the selected edges are extended to the endpoints of fillet arcs. By default, all objects except of circles, ellipses, closed polylines and splines are trimmed or extended when performing filleting.

       When system variable TRIMMODE is set to 1, FILLET trims the intersecting lines to the endpoint of the fillet arc. If the lines does not get intersecting, system extends or trims them to get intersecting.

Specify the Location of the Fillet

       When the objects to fillet are a line and an arc or a circle, there are several potential fillets and system creates the fillet with the endpoint of arc at the nearest the selected point. The location of fillets depends on the place of the objects you specify. As shown in the following picture:

Fillet Line and Polyline Combinations

        If the objects to fillet are a line and a polyline, the line or its extension must be intersecting with one of the polyline segments. With Trim option on, the filleted objects join with the filleted arc to form a new polyline.

Fillet an Entire Polyline

You can use Polyline option to create fillets for each corners of a polyline.

To fillet an entire polyline

1. Choose Modify > Fillet.

2. On the command line, type polyline.

3. Select the polyline.

Modify toolbar 

Command line FILLET

       Before creating fillets, you should ensure the distance between each vertex is long enough to accommodate the fillet radius in order to insert a fillet arc.

      The fillet arcs replace arc segments when the fillet radius is greater than the radius of the arc. As shown in the illustration:

       When the fillet radius is set to 0, no fillet arcs are inserted. If two polyline segments are separated by one arc segments, system deletes this arc segment and extends the lines to intersect with each other.

To fillet selected vertices in a polyline

1. Choose Modify > Fillet.

2. Select the polyline along the segment where you want to begin the fillet.

3. Select the polyline along the segment where you want to end the fillet.

Modify toolbar 

Command line FILLET

Fillet Parallel Lines

      You can fillet parallel lines, rays, and infinite lines. The first entity must be a line or ray, the second entity can be a line, ray, or infinite line. The diameter of the fillet arc is always equal to the distance between the parallel entities. The current fillet radius is ignored.

Commands Reference

FILLET: Rounds and fillets the edges of objects

System Variables Reference

FILLETRAD: Stores the current fillet radius

TRIMMODE: Controls whether selected edges for chamfers and fillets are trimmed