Siemens Sinumerik 840D sl Programming Manual page 212

Glossary
Working area
Three-dimensional zone in which the tool tip can be moved due to the physical design of the
machine. See also -> Protection zone.
Workpiece
The part that is produced/machined on the machine tool.
Workpiece contour
Programmed contour of the -> workpiece to be made/machined.
Workpiece coordinate system
The origin of the workpiece coordinate system is the -> workpiece zero. For working cycles
that are programmed in the workpiece coordinate system, the dimensions and directions
refer to this system.
Workpiece zero
The workpiece zero is the origin of the -> workpiece coordinate system. It is determined
based on its distance from the machine zero point.
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling