Zero Offsets - Siemens SINUMERIK Series Operating Manual

4.8

Zero 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 zero 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 4-1
When the machine zero is not identical to the workpiece zero, at least one offset (base offset
or zero offset) exists in which the position of the workpiece zero is saved.
Base offset
The base offset is a zero 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 "Zero Offset - Base" window.
Coarse and fine offsets
Every zero offset (G54 to G57, G505 to G599) consists of a coarse offset and a fine offset.
You can call the zero offsets from any program (coarse and fine offsets are added together).
You can save the workpiece zero, for example, in the coarse offset, and then store the offset
that occurs when a new workpiece is clamped between the old and the new workpiece zero
in the fine offset.
Note
Deselect fine offset (only 840D sl)
You have the option of deselecting the fine offset using machine data MD18600
$MN_MM_FRAME_FINE_TRANS
Milling
Operating Manual, 08/2018, 6FC5398-7CP41-0BA0
Zero offsets
Setting up the machine
4.8 Zero offsets
145