Creating Tritangent Fillets

The creation of tritangent fillets involves the removal of one of the three faces selected, as the fillet surface is obtained by rolling a sphere, whose radius is automatically computed to be tangent to the removed surface, between the selected surfaces.

Open the Tritangent1.CATPart document.

1. Click Tritangent Fillet .

   The Tritangent Fillet Definition dialog box appears.

2. Select the two Faces to fillet.

3. Select the Extremities that is the relimitation mode:

   Straight: no tangency constraint is imposed at the connecting point between the fillet and the initial support, generating sometimes a sharp angle. Smooth: a tangency constraint is imposed at the connection between the fillet surface and the support surfaces, thus smoothing the connection Maximum: the fillet surface is limited by the longest selected edge Minimum: the fillet surface is limited by the shortest selected edge

   (Refer to Shape Fillets)

4. Select the Face to remove.

   The fillet will be tangent to this face.

5. You can check Trim support to relimit the support elements and assemble them to the fillet.

6. Click OK.

   The faces are filleted. The creation of this fillet is indicated in the specification tree.
   	While creating the fillet, you can limit it by selecting a surface that intersects it completely. This capability is available when clicking More>> and clicking within the Limiting element field prior to selecting the trimming element. For further details, refer to Limiting Fillets.
   	Note that the selection of the feature prevails over the selection of the sub-element. To select a sub-element, you need to apply the ''Geometrical Element'' filter in the User Selection Filter toolbar. For further information, refer to Selecting Using A Filter in CATIA Infrastructure User's Guide.

Filleting Volumes

1. Click Tritangent Fillet .

   The Tritangent Fillet Definition dialog box appears.

2. Select the two Faces to fillet.

3. Select the Face to remove.

   The fillet will be tangent to this face.

4. Click OK to create the fillet volume.

   	Extremities and Trim support are grayed out. They cannot be used with volumes.