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AutoCAD Fillet Command: Applying Fillets to 2D and 3D Objects

AutoCAD’s Fillet operation consists of joining two lines with a round shape. The Fillet command is used to soften corners and edges in 2D and 3D drawings. This tool is similar to the Chamfer operation with the difference that the chamfer joins two lines with a straight line while the fillet joins two lines with an arc.

Fillets can be concave when working with an internal edge and convex when working with an external edge. Convex fillets are also called rounds. There are many ways in which you can use the Fillet command in AutoCAD to further develop your drawings.

Standard Fillet Command in AutoCAD

Standard Fillet Command in AutoCAD

The simplest way to use the Fillet command is to soften an edge as shown in the picture below.

1. When working in the 2D environment, you simply need to click the Fillet icon located in the Modify tab in the Home toolbar. You can also type the word “Fillet” in the command bar, then select the two objects you want.

When working in the 2D environment, you simply need to click the Fillet icon located in the Modify tab in the Home toolbar. You can also type the word “Fillet” in the command bar, then select the two objects you want.

2. After selecting the objects, press Enter and AutoCAD should ask you to enter the radius for the Fillet operation. The default value should be 0.0000.

After selecting the objects, press Enter and AutoCAD should ask you to enter the radius for the Fillet operation. The default value should be 0.0000.

After selecting the objects, press Enter and AutoCAD should ask you to enter the radius for the Fillet operation. The default value should be 0.0000.(2)

3. If AutoCAD doesn’t ask for the radius length, click the word “radius” highlighted in gray in the command bar and type the desired radius. Then press Enter.

If AutoCAD doesn't ask for the radius length, click the word “radius” highlighted in gray in the command bar and type the desired radius. Then press Enter.

Fillet Operation with a Polyline

You can optimize the fillet process when working with a polyline by rounding all edges in one simple operation as long as you want to maintain the same radius for all corners.

Fillet Operation with a Polyline

1. Once you have a polyline like in the image above, you can click the Fillet icon or you can type the word “Fillet” in the command bar. Then select the Polyline option highlighted in gray in the command bar (see picture below).

select the Polyline option highlighted in gray in the command bar (see picture below).

2. Next, select the polyline and press Enter.

Next, select the polyline and press Enter.

Fillet Operation Between Round Shapes

The Fillet operation is not restricted only to edges. The Fillet tool also allows the joining of two round shapes, as shown in the picture below. It’s possible to join both objects with a round tangent line using the standard Fillet operation.

It’s possible to join both objects with a round tangent line using the standard Fillet operation.

1. Click the Fillet icon or type the word “Fillet” in the command bar and select the two round shapes. You can click the Radius option highlighted in gray in the command bar to modify the fillet angle. Then press Enter.

Fillet Operation Between Round Shapes

2. AutoCAD will automatically create a round tangent line between the two closest points. To change the tangent points, it will be necessary to change the radius or stretch the fillet line manually.

Fillet Operation Between Two Separated Lines

You can use the Fillet command to join two lines separated from each other, using the same procedure explained above.

Fillet Operation Between Two Separated Lines

1. Be sure to specify the radius after selecting the Fillet operation, as shown in the picture below. After entering the radius, press Enter and select the two lines.

Be sure to specify the radius after selecting the Fillet operation, as shown in the picture below. After entering the radius, press Enter and select the two lines.

2. Press Enter again to finish the Fillet operation.

Press Enter again to finish the Fillet operation.

Fillet with 3D Objects

The Fillet operation is also available in the 3D environment (3D Basics and 3D model).

1. First, select the solid and make sure to join its constituent parts. This allows you to appropriately define lines and edges to soften them with the Fillet operation.

This allows you to appropriately define lines and edges to soften them with the Fillet operation

2. In the 3D environment, the Fillet icon is located in the Edit tab in the Home toolbar. Select the drop-down menu to display all editing tools and click the first icon on the left.

You can also access the Fillet command by typing the word “filletedge” in the command bar.

You can also access the Fillet command by typing the word “filletedge” in the command bar.

3. Next, select the desired line or edge with the cursor and press Enter.

Next, select the desired line or edge with the cursor and press Enter.

4. AutoCAD will ask you to specify the radius for the Fillet operation. Use the keyboard to input the measurement.

AutoCAD will ask you to specify the radius for the Fillet operation. Use the keyboard to input the measurement.

5. After entering the radius, press Enter and the Fillet operation will be completed as shown in the picture below.

After entering the radius, press Enter and the Fillet operation will be completed as shown in the picture below.

Restoring and Modifying Fillets in AutoCAD

Restoring Fillets

1. To restore round edges to their original shape, select the Fillet command, then hold down the Shift key while selecting the two lines you want to restore.

To restore round edges to their original shape, select the Fillet command, then hold down the Shift key while selecting the two lines you want to restore.

2. After clicking the second line that forms the edge, AutoCAD should show the corner as it was before the Fillet operation. Then press Enter.

AutoCAD should show the corner as it was before the Fillet operation. Then press Enter

3. If you want to restore all edges at once, select the Fillet operation, then click on the word “Multiple” located in the command bar highlighted in gray.

If you want to restore all edges at once, select the Fillet operation, then click on the word “Multiple” located in the command bar highlighted in gray.

4. Next, select the two lines involving each corner while holding down the Shift key.

Next, select the two lines involving each corner while holding down the Shift key.

Since you chose the Multiple option, the Fillet operation will still be on, so you can restore each corner without setting the Fillet command again until you complete the process.

Since you chose the Multiple option, the Fillet operation will still be on, so you can restore each corner without setting the Fillet command again until you complete the process.

Modifying the Radius

1. If you want to modify the radius, select the Fillet tool, then click the word “Radius” highlighted in gray in the command bar.

If you want to modify the radius, select the Fillet tool, then click the word “Radius” highlighted in gray in the command bar.

2. Next, type in the new radius in the command bar and press Enter.

Next, type in the new radius in the command bar and press Enter.

3. Select the two lines that form the round edge. AutoCAD will display the new radius in blue and the old radius in a faded gray, as shown in the picture below.

Select the two lines that form the round edge. AutoCAD will display the new radius in blue and the old radius in a faded gray, as shown in the picture below.

Using the Fillet Operation to Trim Lines

You can also use the Fillet operation to trim lines by changing the radius. It’s a useful method to trim cross-sections or dissected lines.

1. First, select the Fillet tool, then click on the word “Radius” highlighted in gray in the command bar.

First, select the Fillet tool, then click on the word “Radius” highlighted in gray in the command bar.

2. Next, make sure the radius is equal to 0.0000 and press Enter.

Next, make sure the radius is equal to 0.0000 and press Enter.

3. Select the two lines you want to trim, as shown in the picture below.

Select the two lines you want to trim, as shown in the picture below.