This option uses the machine definitions spindle main direction vector definition as the reference for finding the side tilt direction. The side tilting is happening always from the view defined by the spindle main direction vector. E.g. if spindle main direction vector is the z axis and side tilting of 90 degrees from surface normal takes place, then the tool axis orientation is the surface normal rotated 90 degrees towards spindle main direction. In practical terms, such a rotation can be handled by a machine tool without utilizing the C axis.
Hit the "Advanced" button for advanced options
and the advanced options windows pops up
Go to
Gradual side tilt angle change