Work Offsets - Siemens SINUMERIK 840D Operation/Programming Manual

2
10.04
2.14

Work offsets

Base offset
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Operation/Programming ShopMill (BAS) – 10.04 Edition
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 = machine). The program for machining the
workpiece, however, is based on the workpiece zero (W) of the
workpiece coordinate system (WCS = work).
The machine zero and workpiece zero are not necessarily identical.
The distance between the machine zero and workpiece vary in
accordance with the type of tool 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.
In ShopMill, the position actual value display refers to the settable
zero system. The position of the active tool relative to the workpiece
zero is displayed.
The offsets are summated as follows:
Tool offset
Basic offset
M

Work offsets

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.
The base offset is a work offset that is always active. If you have not
defined a base offset, its value will be zero. You determine the base
offset via "Workpiece zero" (see Sec."Measurement workpiece zero")
or "Set work offset" (see Sec. "Setting a new position value").
2.14 Work offsets
W
WCS
Transformation of coordinates
Work offset fine
Work offset coarse
2
Operation
Machine
2-161