Work Offsets - Siemens SINUMERIK 828D Operating Manual

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 (MCS). The program for
machining the workpiece, however, is based on the workpiece zero (W) of the workpiece
coordinate system (WCS). 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 (MCS).
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.
HMI sl Milling
Operating Manual, 06/2009, 6FC5398-7CP20-0BA0
8. Press the <CYCLE START> key.
The calibration starts.
When the length is calibrated, the length of the workpiece probe is
calculated and entered in the tool list.
When calibrating the radius, the exact hole center point is determined
first. Then the four trigger points on the inside wall of the hole are
approached.
This procedure is carried out automatically twice: First with 180° (to the
starting position of the working spindle) and then in its starting position.
Work offsets
Setting up the machine
2.7 Work offsets
89