Siemens SINUMERIK 840D sl Programming Manual page 364

Coordinate transformations (frames)
12.6 Programmable scale factor (SCALE, ASCALE)
Scaling and offset
Note
If an offset is programmed with ATRANS after SCALE, the offset values will also be scaled.
Different scale factors
CAUTION
Please take great care when using different scale factors! Circular interpolations can, for
example, only be scaled using identical factors.
Note
However, different scale factors can be used specifically to program distorted circles.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals