About Dragging Surface Finishes Beyond the Placement Surface
You can drag surface finishes in the XY-direction beyond the placement surface if the placement surface is planar. Creo Parametric creates an extension line in the XY-direction when you drag the surface finish off the reference surface as shown in the following figure.
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1. Start point
2. Extension Line
3. Surface Finish
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1. 1 Extension Line
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You can drag the surface finish in the Z-direction even when it is off the surface till the surface finish reaches a point where an extension line cannot intersect the placement surface. The movement of the surface finish in the Z-direction stops at the boundary of the surface.
You can also drag the surface finish attached to a conic or cylindrical silhouette off the surface in the direction of the silhouette if:
• The current model orientation is the same as the annotation plane orientation of the selected surface finish.
• The surface finish is attached to the silhouette of a conic or cylindrical surface.
• The Annotation plane is parallel to the axis of the cone or cylinder.
The following figure shows the movement of the surface finish along a cylindrical silhouette.
 | Flat to screen surface finishes do not have a directional annotation plane and do not support an extension line. You cannot drag surface finishes off the model surfaces that are created flat to screen. |