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

6.5.2

1-point measurement and ZO determination

6.5.2.1

General information

Function
With this measuring cycle and the _MVAR=100 measuring variant, the actual value of a
workpiece is determined with reference to the workpiece zero in the selected measuring axis
_MA. An empirical value from data block GUD5 can be included with the correct sign.
The zero offset (ZO) is applied in such a way that the actual value adopts the required
setpoint (_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.
For detailed information on specifying _KNUM for the zero offset: see section "Description of
the most important defining parameters".
Prerequisite
If necessary, the workpiece must be positioned in the correct angular spindle position with
SPOS before the cycle is called.
Parameter
Parameter
_MVAR
_SETVAL
_MA
_KNUM
1) Measurement in the 3rd axis of the plane (with G18 in Y) is also possible, provided this axis exists.
Moreover, for measurement in the 3rd axis of the plane with active G18 (measurement in the Y axis),
the same setpoint parameterization can be used as for measurement in the X axis (facing axis), if
_CHBIT[19]=1 is set in block GUD6. The offset is then stored in the X-component of the selected ZO
memory.
Additional parameters _VMS, _TSA, _FA, _PRNUM, _EVNUM and _NMSP also apply.
See also
Defining parameters (Page 2-2)
Result parameters (Page 2-4)
Variable measuring velocity: _VMS (Page 2-14)
Tolerance parameters: _TZL, _TMV, _TUL, _TLL, _TDIF and _TSA (Page 2-15)
Measurement path: _FA (Page 2-16)
Probe type, probe number: _PRNUM (Page 2-17)
Empirical value, mean value: _EVNUM (Page 2-18)
Multiple measurement at the same location: _NMSP (Page 2-19)
Measuring cycles
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Data type Meaning
100 1-point measurement and ZO determination
REAL Setpoint, with reference to the workpiece zero
1)
1, 2, 3 Measuring axis
1)
0, >0 0: No automatic ZO correction
>0: With automatic ZO correction
(individual values: see section "Description of the most important
defining parameters", Parameter _KNUM)
Measuring Cycles for Turning Machines
6.5 CYCLE974 workpiece: 1-point measurement
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