Fundamental Geometrical Principles; Workpiece Positions; Workpiece Coordinate Systems - Siemens SINUMERIK 840D sl Programming Manual

Fundamental Geometrical Principles

1.1

Workpiece positions

1.1.1

Workpiece coordinate systems

In order that the machine or the control can work with the positions specified in the NC
program, these specifications have to be made in a reference system that can be transferred
to the directions of motion of the machine axes. A coordinate system with the axes X, Y and Z
is used for this purpose.
DIN 66217 stipulates that machine tools must use clockwise, right-angled (Cartesian)
coordinate systems.
Figure 1-1 Workpiece coordinate system for
turning
The workpiece zero (W) is the origin of the workpiece coordinate system.
Sometimes it is advisable or even necessary to work with negative position specifications. For
this reason, positions that are to the left of the zero point are assigned a negative sign ("-").
Fundamentals
Programming Manual 09/2011, 6FC5398-1BP40-2BA0
Figure 1-2 Workpiece coordinate system for
milling
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