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

Fundamental Geometrical Principles
1.4 Coordinate systems
1.4.2

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).
On such machines, machine axes and geometry axes can have the same names.
Figure 1-6
Machine tools with kinematic transformation
BCS and MCS do not coincide when the BCS is mapped onto the MCS with kinematic
transformation (e.g. 5-axis transformation, TRANSMIT/TRACYL/TRAANG).
On such machines the machine axes and geometry axes must have different names.
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MCS = BCS without kinematic transformation
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals