Work Offsets - Siemens SINUMERIK 840D Operating Manual

Setting up the machine

2.7 Work offsets

2.7 Work offsets
Following reference point approach, the actual value display for the axis coordinates is
based on the machine zero (M) of the machine coordinate system (Machine). The program
for machining the workpiece, however, is based on the workpiece zero (W) of the workpiece
coordinate system (Work). The machine zero and workpiece zero are not necessarily
identical. The distance between the machine zero and the workpiece zero depends on the
workpiece type and how it is clamped. This work offset is taken into account during
execution of the program and can be a combination of different offsets.
Following reference point approach, the actual value display for the axis coordinates is
based on the machine zero of the machine coordinate system (Machine).
The actual value display of the positions can also refer to the SZS coordinate system
(settable zero system). The position of the active tool relative to the workpiece zero is
displayed.
Figure 2-1
When the machine zero is not identical to the workpiece zero, at least one offset (base offset
or work offset) exists in which the position of the workpiece zero is saved.
Base offset
The base offset is a work offset that is always active. If you have not defined a base offset,
its value will be zero. The base offset is specified in the "Work offset - Base" window.
Coarse and fine offsets
Every work offset (G54 to G57, G505 to G599) consists of a coarse offset and a fine offset.
You can call the work offsets from any program (coarse and fine offsets are added together).
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Work offsets
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling