Rounding an Edge

  1. Click the Pull tool in the Edit group on the Design tab.
  2. Select the edge or edges you want to round. Double-click to select a tangent chain.
    You can also select the vertex of an inside or an outside corner of a surface.
  3. Select the Round option in the Options panel or from the mini-toolbar. This option is automatically selected for edges that can be rounded.
  4. Click and drag the edge in the direction of the Pull arrow.
    To dimension the round, press the Spacebar, type the radius, and press Enter.
    When you pull an edge to create a round, the Pull tool determines whether it should be a constant radius or a variable radius round based on the geometry.
    Once you create a round, pulling an adjacent face also pulls the round.
    When you round more than one edge at the same time, and one or more of the rounds cannot be created, only the successful rounds are created.
    Note: The face hidden by the round is remembered, so that if you fill the round it can be displayed. If you move a round, the face hidden by it is also moved.

Example:
Rounding the inside and outside corner of two surfaces.
Pulling edges on geometry that automatically determines rounds will be variable radius.
When creating surface-to-surface rounds, the expansion direction depends on the order in which you select the edges. In the example above, the rounds expand toward the left because the upper edge was selected first.
Rounding the edge created by two rounds with one edge not tangent.
Pulling rounds in a tangent chain. Pulling the selected tangent chain does not change the round shown in blue.
Pulling rounds on tangent chain
Adding and changing a rounded edge on a shelled or offset part changes the inside faces.
Rounding elliptical edges.