Measurement And Zo Determination; General Information - Siemens SINUMERIK 840D sl Programming Manual

5.5.3

Measurement and ZO determination

5.5.3.1

General information

Function
Using this measuring cycle and the _MVAR=100, _MVAR=1100
measuring variants, the position of a paraxial surface can be determined in the workpiece
coordinate system.
The zero offset (ZO) of the associated workpiece can also be determined and corrected.
The offset is corrected in such a way that the real position of the surface (actual value)
adopts the required set angle (_SETVAL) in the workpiece coordinate system when the
corrected ZO (frame) is used.
Mirroring can be active in a frame of the frame sequence. Dimension factors must never be
active.
The ZO to be corrected is specified in coded form with variable _KNUM >0.
The ZO can be specified and corrected by various methods, e.g. in various settable frames,
in various basic frames, system frames, fine offset, or coarse offset, etc.
If _KNUM=0, there is no ZO correction.
For detailed information on specifying _KNUM for the zero offset: see Parameter description
section "Description of the most important defining parameters".
An empirical value stored in data block GUD5 in array _EV[ ] can be included in calculation
of the result after measurement is completed.
This is activated in _EVNUM (see Parameter description Section "Description of the most
important defining parameters").
Parameter
Parameter
_MVAR
_SETVAL
_MA
_KNUM
The following additional parameters are also valid:
VMS, _CORA, _TSA, _FA, _PRNUM, _EVNUM and _NMSP
_CORA only relevant for monodirectional probe.
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
5.5 CYCLE978 workpiece: Measuring a surface parallel to the axis
Data type Meaning
100 ZO determination on surface and ZO correction
1100 ZO determination on surface with differential measurement and ZO
correction
REAL, >0 Setpoint with respect to workpiece zero
1...3 Number of the measuring axis
0, >0 0: without automatic ZO correction
>0: with automatic ZO correction
(individual values: see Parameter description section "Description of the
most important defining parameters", Parameter _KNUM)
Measuring Cycles for Milling and Machining Centers
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