Part Modeling > Engineering Features > Round > About the Round Feature
About the Round Feature
A round is an edge treatment feature in which a radius or chord is added to one or more edges, an edge chain, or the space between surfaces. Surfaces can be solid model surfaces, or they can be zero-thickness quilts or surfaces.
To create rounds, you must define one or more round sets. A round set is an organizational unit containing one or more pieces of round geometry. After you specify round placement references, default attributes, radius or chord values, and transitions are used to create a round that best fits the selected geometry. When you select multiple references, the round propagates across tangent neighbors until it encounters a break in tangency. However, if you use a One-by-One chain, the round does not propagate across tangent neighbors.
You can see a preview of the round in the graphics window, and you can add or modify round pieces and transitions before feature creation. You can also select a new round creation algorithm, a cross section shape, one or more radius or chord values, and one or more transitions. A round radius can be constant or variable along the selected edge or surface set.
When you create a round, you can exclude pieces of the selected geometry. This option is available only if the current round set contains two or more round pieces that use one explicit placement reference. This can occur if the round geometry breaks due to non-tangent chains. It can also occur if a single round piece cannot be created at a certain radius or chord value. For example, a round that is too large to sweep around a corner.
Anatomy of a Round
A round consists of the following items:
Sets—Round pieces (geometry) created pertaining to the placement references. Round pieces consist of unique attributes, geometric references, and one or more radii or chords.
Transitions—Filler geometry that connects round pieces. Transitions are located where round pieces intersect or terminate. Default transitions are used during the initial round creation, though other transition types are available.
Round Sets and Transitions
Set Mode Display
Transition Mode Display
Two edge references are selected for the round set. Preview geometry of the two round pieces and the radius or chord value are displayed.
All transitions for the round feature are displayed. Two round pieces are displayed for context.
1. Round piece
2. Edge reference
1. Transition
2. Round piece