HEIDENHAIN ITNC 530 User Manual page 496

9.7 Defining the Machining Plane
with a Single, Incremental
Space Angle: PLANE RELATIVE
Function
Use the incremental space angle when an already active tilted
machining plane is to be tilted by another rotation. Example:
machining a 45° chamfer on a tilted plane.
Before programming, note the following:
The defined angle always applies to the active machining
plane, no matter which function you used to activate it.
You can program any number of PLANE RELATIVE functions
in a row.
If you want to return to the machining plane that was
active before the PLANE RELATIVE function, define the
PLANE RELATIVE function again with the same angle but
with the opposite algebraic sign.
If you use the PLANE RELATIVE function on an untilted
machining plane, then you simply rotate the untilted plane
about the space angle defined in the PLANE function.
Parameter description for the positioning behavior: See
"Specifying the Positioning Behavior of the PLANE
Function," page 498.
496 9 Programming: Special Functions