Siemens SINUMERIK 840D sl Programming Manual page 190

Measuring Cycles for Milling and Machining Centers
5.7 CYCLE998 workpiece: Angle measurement and ZO determination
With 2-angle measurement:
● If a workpiece has a plane that is inclined in space:
The angular position is corrected, taking account of set angles in the specified frame (ZO).
Note
In this cycle, only the rotation components of the frame are determined and corrected
(except for rotary table). To complete correction of the ZO (frame), a further measuring cycle
is required to determine the translation component (e.g. CYCLE977 or CYCLE978).
An empirical value _EV[ ] stored in the GUD5 data block can be included in the
measurement result with the correct sign. This is activated in _EVNUM (see Parameter
description Section "Description of the most important defining parameters").
A special measuring variant permits differential measurement with the axes of the plane. The
special procedure for this measurement permits use of an uncalibrated multidirectional
probe.
Workpiece probe types that can be used
● Multidirectional probe (_PRNUM=0xy)
● Mono-directional, bi-directional probe (_PRNUM=1xy)
190
The angular offsets are applied in the rotation part of the geometry axes.
(These probes should be used only with low accuracy requirements!)
NOTICE
A monodirectional or bi-directional probe must always be calibrated!
These probes cannot be used for the differential measurement!
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Measuring cycles