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See also: Trimming Surfaces
A trimmed surface is a surface with a piece removed along a surface curve.
You can use the Trim Surface (Edit menu) command to do this.
Note that trimming is not permitted on a surface group, since it would be necessary to specify which part of each surface member would be retained and which would be removed.
Trimming is a convenient way of constraining a toolpath in order to prevent the gouging of adjacent surfaces.
A trimmed surface can be exploded as any other surface.
Sometimes a sequence of intersection operations produces a set of surface curves which intersect or have gaps between their ends. In order to produce a boundary which the Trim Surface command will understand, the curves must be trimmed against each other.
The portion of the curve retained during a trim operation is the one closest to the digitised point. When the intersection point is beyond the end of a curve, the last vector on the curve is extended to that point.