To machine a blisk, each blisk component must be grouped into a series of levels or sets. The model in this example contains the necessary levels and sets.
Note: It is important that the hub, shroud, left blade, right blade, and splitter blade (if they exist) are all in individual levels/sets.
— hub
— shroud
— left blade
— right blade
These four sets/levels are the only surfaces that are required to machine the whole blisk.