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The model selection in the operation is really intended as an override for the model defined in the job setup. Most of the time you shouldn't really need to use it. The purpose of defining the models in the setup (or in the individual operation) is to let the CAM system know which bodies/components it needs to be concerned with and which it can ignore. But note that this isn't just defining what areas can be machined, it's also defining what areas it needs to *avoid*. Any object included as a "model" in the job setup or operation will be avoided unless it is specifically included within the machining boudary. For defining the machining boudaries you use the "Geometry", "Slope", "Rest Machining", and "Avoid/Touch Surfaces" settings.
I rather like using touch surfaces for defining what to machine because many times it's easier to pick the surfaces directly than to pick an edge boundary. But this depends on the part. Sometimes an edge boundary is easier.
C|
Fusion