Zero-Point Offsets - Siemens SINUMERIK 840D sl Operation/Programming Manual

08/2005
2
2.7

Zero-point offsets

Base offset
♥ Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 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.
For ShopTurn, the actual value display of the positions is relative to
the ENS coordinate system. The position of the active tool relative to
the workpiece zero is displayed.
The offsets are summated as follows:
Total
offset
Work offset coarse
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 "Zero-point workpiece" (see Sec. "Measuring the Workpiece
Zero-point") or "Setting the Zero-point Offset" (see Sec. "Setting the
Zero-point Offset").
Setting Up the Machine
2.7 Zero-point offsets
W
WCS
Coordinate transformation
Work offset fine
2
MCS
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