Siemens SINUMERIK 840DE Programming Manual page 79

Milling:
Turning:
Note
On conventional turning machines it is standard practice to interpret incremental NC blocks
in the transverse axis as radius values, while diameter dimensions are valid for absolute
coordinates. This conversion for G90 is performed using the commands DIAMON, DIAMOF
or DIAM90.
For dimensioning for diameter or radius see
Circular interpolation, G2/G3
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Positional Data
3.2 Absolute/relative dimensions
3-5