Work Offsets; Overview; Display Active Zero Offset - Siemens SINUMERIK 840D sl Operating Manual

Setting up the machine

2.5 Work offsets

2.5 Work offsets
2.5.1

Overview

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 program for machining the workpiece, however, is based on the workpiece zero of the
workpiece coordinate system (WCS). 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 zero offset is taken into account
during execution of the program and can be a combination of different 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.
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 "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.
2.5.2

Display active zero offset

The current active offsets and all active system offsets are displayed for all set-up axes in
the "Zero offset - Active" window.
This window is generally used only for monitoring.
Display of active zero offsets
Work offsets
Set zero offset
Entire Base ZO
40
Display of active system offsets. You can alter the data under certain
circumstances, i.e. you can correct a zero point.
Access to the system offsets is protected via a keyswitch.
Display of all active base offsets, as well as rotation, scaling and
mirroring if these are set.
You cannot edit these values here.
Operating Manual, 11/2006, 6FC5398-6AP10-1BA0
HMI sl Universal