Basic Coordinate System (Bcs) - Siemens Sinumerik 840D sl Programming Manual

Fundamental Geometrical Principles
2.4 Coordinate systems
Position of the coordinate system in different machine types
The position of the coordinate system resulting from the "three-finger rule" can have a different
orientation for different machine types. Here are a few examples:
2.4.2

Basic coordinate system (BCS)

The basic coordinate system (BCS) consists of three mutually perpendicular axes (geometry
axes) as well as other special axes, which are not interrelated geometrically.
Machine tools without kinematic transformation
BCS and MCS always coincide when the BCS can be mapped onto the MCS without kinematic
transformation (e.g. 5-axis transformation, TRANSMIT/TRACYL/TRAANG).
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Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals