About Chamfer Patches and Chamfer Pieces
To successfully exclude, trim, or extend chamfer geometry, an understanding and accurate identification of chamfer patches and pieces is necessary. A chamfer piece is chamfer geometry that is placed at the selected references. A chamfer piece can contain patches. A patch is a neighbor that is tangent to the end of the chamfer piece that is being created. This tangency occurs due to existing model geometry. The following table illustrates chamfer patches and pieces.
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One Chamfer Piece with Three Patches
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Two Chamfer Pieces without Patches
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After you select the edge reference, the chamfer piece is automatically propagated across all tangent points resulting in tangent segments called patches. In the illustration below, tangency occurs due to the existing round geometry.
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After you select two edge references, the system places two separate chamfer pieces at the selected references to create the chamfer. In the illustration below, tangency does not occur due to the vertex. This results in the two overlapping chamfer pieces. The system uses transitions to resolve this discontinuous geometry.
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 1. Edge reference 2. Patch 3. Patch 4. Patch 5. Existing round geometry |
 1. Edge references 2. Overlapping chamfer pieces |