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Create a flange or extension based on angle as it relates to a face or vector.

NX Blend Corner is used to clean up existing blend like intersecting faces. This tool can be used to reduce the number and complexity of patch faces used to create intersecting geometry. Blend Corner can be used to make intersecting blended vertices look more aesthetically pleasing or to make the CAD geometry reflect the actual part.

Blend Corner can be used on both "dumb" or un-parameratized geometry and fully featured history tree. It can also be used on solids and surfaces alike.

The Limit Curves on each blend or blend-like face create Transition Curves that are used to create the new surface. Multiple intersecting blended faces can be selected and edited.

By de-selecting Patch Into Part, you can use tools like Deviation gauge to see the difference between the new patch and old faces. Then make the call.

This tips and tricks tutorial shows some of the NX Fill Surface capabilities in NX 10 CAD from Siemens PLM Software.

Using the NX Fill Surface tool, you can add geometry to a surface or sheet body, patch holes, or partial holes, in the surface. As well control the continuity of the newly created surface from G0 (Coincident or Position), G1 (Tangent) or G2 (Curvature). By selecting the edges of the surface, you can also Patch the newly created surface into the part.

By default, any curve selected with Fill Surface is a G0 continuity condition. Selection of edge curves allows you to use the Curve Rule to select Single, Connected, Tangent, etc., curves minimizing the number of mouse clicks you need to do to accomplish the pick. Using the Curve Rule will also help if the number of curves needed to patch a hole in a surface changes, but still follow the rule you selected; Tangent curves for instance. Forcing Fill Surface to Fit to Curves, allows you to control to the topology of the new surface.