Siemens SINUMERIK 840D sl Programming Manual page 14

Description
1.4 Reference points on the machine and workpiece
A distinction is made between the basis, work offset (G54 ... G599) and programmable work
offset. The basic area contains further subsections – such as the basic work offset, channel-
specific basic work offset and configuration-dependent work offsets (e.g. rotary table
reference or basic reference).
The specified work offsets are effective together as chain and result in the workpiece
coordinate system.
Note
Scale factors with a scaling value unequal to "1" are not supported by the measuring cycles!
Mirroring functions are only permitted in conjunction with counterspindles on lathes.
The machine and workpiece coordinate system can be set and programmed separately in
the "inch" or "metric" system of units (G70/G71).
Note
Transformation
 Measure workpiece
 Measure tool
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Workpiece measurements are always performed in the workpiece coordinate system. All
descriptions relating to workpiece measurement refer to it!
When measuring tools with kinematic transformation active, a distinction is made
between basic coordinate system and machine coordinate system.
If kinematic transformation is deactivated, this distinction is made.
All subsequent descriptions relating to tool measurement assume that kinematic
transformation is disabled and therefore refer to the machine coordinate system.
Programming Manual, 02/2011, 6FC5398-4BP40-0BA0
Measuring cycles