HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 36)

36 NC programming
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Linear and rotary axes
Principal axes: Coordinates of the X, Y and Z axes refer to the
workpiece zero point.
C axis as reference axis:
 Angle data are with given respect to the zero point of the C axis.
 C-axis contours and C-axis operations:
 Positions on the front/rear face are entered in Cartesian
coordinates (XK, YK), or polar coordinates (X, C)
 Positions on the lateral surface are entered in polar coordinates (Z,
C). Instead of C, the linear value CY can be used ("unrolled"
reference diameter).
Units of measure
You write NC programs in metric or inch values. The unit of measure
is defined in the "Unit" box (See "HEADER section" on page 48.).
 The smart.Turn editor respects only address letters of
the configured axes.
Once the unit of measure has been defined, it cannot be
edited any longer.