However, surface modelers can usually import data that a solid modeler might fail to accept at all. Both types of programs offer methods for fixing problems-such as poorly trimmed surfaces or overlapping edges-that might result from inexperienced product designers or inaccurate data translation. First, they tend to be more tolerant of poor quality data. Surface modelers still have two general advantages over solid modelers for the first stage of the mold design, the creation of the core and cavity. Michiana Global Mold’s Director of Business Development Shares Three Favorite People-Focused Articles Thus, the distinction between the two types of system is now not so clear-cut. Since then, the developers of surface modelers have made their systems much easier to use, while the suppliers of solid modelers have added more flexible modeling tools. When they were first introduced almost 20 years ago, solid modelers had the advantage of being much easier to learn and use, but they lacked the flexibility of surface modelers in creating complex shapes. Solid modeling is based principally on standard geometric shapes, which can be combined in various ways, mainly developed from the Boolean operations of subtraction, addition and intersection.

The surfaces can be joined together to enclose a volume and so represent complete objects. It is based on shaping surfaces by pulling, bending, twisting and stretching them until the required shape is created. Surface modeling was the earliest form of CAD. The main methods for creating designs are solid modeling and surface modeling.

Creating the optimum split surface for the core often requires small adjustments, which can be undertaken most easily with surface modeling.

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