HEIDENHAIN iTNC 530 (340 49x-03) Pilot - Manual (Page 10)

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Circle Center and Pole: CC
The circle center CC must be entered to program circular tool movements
with the path function C (see page 26). CC is also needed to define the
pole for polar coordinates.
CC is entered in Cartesian coordinates.
An absolutely defined circle center or pole CC is always measured from
the workpiece datum.
An incrementally defined circle center or pole CC is always measured
from the last programmed position of the tool.
Angle Reference Axis
Angles—such as a polar coordinate angle PA or an angle of rotation ROT—
are measured from the angle reference axis.
X
Y
CC
CCX
CCY
CC
ICCX
ICCY
X
Z Y
X
Z
Y
X
Z
Y
Working plane Ref. axis and 0° direction
X/Y +X
Y/Z +Y
Z/X +Z