How to choose and set the options for the fillet tools based on the type of transition surface you need to build.

Choose Surfaces > Surface Fillet ❒ to show the fillet control window.

The Construction Type and Variable Fillets options let you choose how the tool creates the fillet surface:

• If Construction Type is set to Radius and Variable Fillets is turned off, the fillet maintains a constant radius along its entire length.
• If Construction Type is set to Chord and Variable Fillets is turned off, the fillet maintains a constant width (chordal length) along its entire length.
  
  Note

  The chordal length is the length of the straight line that joins both sides of the fillet, at a given U parameter value.

  

  Constant Radius and Chord fillets.

• If Construction Type is set to Radius and Variable Fillets is turned on, you can set the radius at different points along the length of the fillet. See Control the radius along the length of a variable fillet surface for details.
• If Construction Type is set to Chord and Variable Fillets is turned on, you can set the chordal length (or tangent length) at different points along the length of the fillet. See Control the chordal length along a variable fillet surface for details.
  

  Variable Radius and Chord fillets.