Otherwise, when the feature boundary intersects with the work piece borderline,the feature should be step.
Currently, this prototype of UPC i can deals with several simple features, including planar face, the associated operation attributes such as spindle speed, federate, coolant etc are reconstructed. These features and its operations are represented with STEP - NC entities. For each section, a pair of a feature and an operation can be generated. However, for a single feature it is common to have more than one, usually two, operations. It means it is possible for two adjacent sections to share one features .