Problem: Theoretically with a milling spindle with 5 axises, every point within the working range in every arbitrary angle can be reached.
Therefore 5 axis are sufficient in order to mill every arbitrary workpiece.
But it would mean a relatively big effort or it'd be practically impossible, to process a workpiece from the bottom as it has to be stretched.
This problem often occurs during chair production where parts have to be processed three-dimensionally from all sides.
Mostly the solution is the workpiece, similar to the lathe, clamped between two peaks and is CNC-controlled via a lathe and can be pivoted during the process.
In the shape construction CNC-controlled pivoting tables are partially used. The purpose of it is that even big workpieces can be processed with a relatively small working range of milling spindles.