Machine Path Generation Using Direct Slicing from Design-by-Feature Solid Model for Rapid Prototyping

Because of the differences in the rapid prototyping (RP) processes, there is no standard machine path code for them. For each RP process, based on its characteristics and requirements, the required data are extracted from the CAD model and converted into proper format for the RP machine. Slicing a CAD model through intersecting the model with the XY-plane at each Z increment is a well-known method of path generation. Slicing a CAD model is currently conducted through Stereolithography (STL) file slicing, direct slicing, and additive direct slicing. In this paper, a direct slicing approach inside a design-by-feature solid modeler is proposed. Autodesk Inventor solid modeler, as a design-by-feature solid modeler is used for 3D solid modeling. The proposed system is implemented by Visual Basic codes inside Inventor. In this approach, first protrusion and subtractive features that form a model are extracted. Then, the intersection of each feature and the XY plane is identified. Then, internal and external loops are found. Finally a continuous path in required format is generated. Depending on the specific RP process requirements, additional features such as internal or external hatch can be added to the machine path.Mechanical Engineerin