Measuring And Tool Offset; General Information - Siemens SINUMERIK 840D sl Programming Manual

Measuring Cycles for Milling and Machining Centers
5.5 CYCLE978 workpiece: Measuring a surface parallel to the axis
5.5.4

Measuring and tool offset

5.5.4.1

General information

Function
Using this measuring cycle and the _MVAR=0, _MVAR=1000measurement variants, the
measurement (position) of a paraxial surface can be determined in the workpiece coordinate
system.
Automatic tool offset is also possible. This tool is specified in _TNUM and _TNAME. The D
number and type of offset are specified in coded form in variable _KNUM.
With an extended tool offset, a tool from a particular stored tool environment _TENV, and
additive or setup offsets can be corrected by specifying the DL number in _DLNUM.
Detailed information on the parameters: see Parameter description section "Description of
the most important defining parameters".
Empirical values and mean values
An empirical value stored in data block GUD5 in array _EV[ ] can be included in calculation
of the result after measurement is completed.
Optionally, averaging is performed over a number of parts (array _MV[ ]) and the tolerance
bands are checked.
Both are activated in _EVNUM (see Parameter description Section "Description of the most
important defining parameters").
Parameters
Parameters
_MVAR
_SETVAL
_MA
_KNUM
_TNUM
_TNAME
_DLNUM
_TENV
The following additional parameters are also valid:
_VMS, _CORA, _TZL, _TMV, _TUL, _TLL, _TDIF, _TSA, _FA, _PRNUM,
_EVNUM, _NMSP and _K
_CORA only relevant for monodirectional probe.
The parameters must also be assigned if _KNUM=0 because they refer to the workpiece.
168
Data type Meaning
0 Measure surface and tool offset
1000 Measure surface with differential measurement and tool offset
REAL, >0 Setpoint (acc. to drawing)
1...3 Number of the measuring axis
0, >0 0: without automatic tool offset
>0: with automatic tool offset
INT, ≧0 Tool number for automatic tool offset
STRING[32] Tool name for automatic tool offset
(alternative to _TNUM with tool management active)
INT, ≧0 DL number for additive/setup offset
STRING[32] Name of tool surroundings for automatic tool offset
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Measuring cycles