The Auto PrtgCrv command lets you automatically create smooth parting curves by calculating a best-fitting parting curve based on existing user-created parting curves and a minimum radius. When the model is regenerated, the system remembers the parent parting curves and the radius of curvature, so that it can update the final parting curve.

The Auto PrtgCrv command produces a single continuous curve representing either a minimum or maximum tangent draft condition with a user-specified minimum radius. The system requires two parting curves representing two pull directions, each curve may consist of multiple segments.

In the following illustration, parting curve 1 and parting curve 2 are on the same part, share the same parting surface, but have different pull directions. The system created the automatic parting curve 3 based on the user-specified minimum radius 4.