Siemens SINUMERIK 840DE Programming Manual page 30

Fundamental Geometrical Principles
1.3 Position of coordinate systems
If there is no kinematic transformation, the basic coordinate system differs from the machine
coordinate system only in terms of the axis designations.
The activation of a transformation can produce deviations in the parallel orientation of the
axes. The coordinate system does not have to be at a right angle.
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Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals