Fillets and Rounds

Fillets and Rounds are related to each other. Both are curves added to the edges of a part. Fillets add material to the intersection edge of two faces to create a smooth transition from one face to another. This serves to strengthen the joint. Rounds remove material from the exterior edges of two intersecting faces. A Round removes sharp edges, keeps the corners from chipping and prevents a part from sticking to a mold.  This tutorial will explore both of these features.

Procedure

Create a Rectangular Solid with Dimensions 4 x 3 x 2 inches. Sketch a rectangle on the front face with the Dimensions as shown.

Fig.1 Starting Geometry

Extrude the rectangle, with a Cut, a Taper Angle of –10, and a depth of .75, as shown.

Fig.2 Block set up

Click OK.

Fig.3 Completed Block

Note:

If you have difficulty with this block, please review the tutorial on Extruding.

Adding Rounds and Fillets

On the inside edges of the pocket, we are going to add Fillets of .25 inch, and use the Blended Corner option.

On the Features tool bar, choose .

Change the Radius to .25 as shown.

Fig.4 Radius change

Click on the Arrow tab in the bottom right corner of the dialog box and change the settings to those shown in Figure 5.

Fig.5 Options tab

Click on all the inside edges as shown in Figure 6. You might have to rotate the box to get a clear view of the edges as you select them. You should have chosen 8 edges.

Fig.6 Edges Selected for Fillets

Click OK.

Fig.7 Fillets applied 

On all outside edges, we are going to add Rounds of .2 inches. The command for Round is the same for Fillet. Choose the Fillet feature from the Features tool bar, as before.

Change the Radius to .2 inches. Click the arrow in the lower right hand corner and make the selections as shown in Figure 8.

Since we are going to be choosing the edges that we are applying the round to, we do not check the “All Rounds” option.

Fig.8 Edges for Rounds chosen

Click OK.

Additional Exercise:

- Create the geometry shown: