Mold Design and Casting > Working with Parting Surfaces > About Parting Surfaces
  
About Parting Surfaces
A parting surface is a surface in the model that you designate to split a workpiece, die block, or another volume. A parting surface is made up of a set of features, with the first feature called the base quilt. Any additional features that you create using operations such as trim, merge, and extend are called patches. Before completing a parting surface, you must merge all the patches.
A parting surface must completely intersect the volume and cannot intersect itself. When creating a parting surface, make sure to fill any loops lying on the parting curve.
You can create a parting surface with the following methods:
Copying reference geometry
Using engineering tools such as Round and Draft
Using base feature tools such as Extrude, Revolve, and Sweep
Using automatic parting surface creation methods such as Skirt, Shadow, and Shut Off