4th axis wrapping allows you to wrap a 2 1/2 D feature around either the X or Y axis. You must have a machine tool with 4th axis capabilities to take advantage of this feature.
Basic 4th axis wrapping requirements
How to create a NC program using 4th axis wrapping
Creating a 4th axis wrapped feature from a 3D model
Restrictions of 4th axis wrapping
See also Indexing.