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

Starting positions for various measuring tasks
The starting positions before cycle call depend on the measuring task, the value of the
setpoint _SETVAL, the measuring axes, and the cutting edge position (SL) of the workpiece
probe.
The probe must be positioned facing the point to be measured and is reached by traversing
measuring axis _MA in the setpoint direction in the measuring cycle. The setpoint (position of
the point) is defined by parameter _SETVAL.
Measurement is possible parallel to and in the direction of the axes permitted by the "cutting
edge position" of the workpiece probe inserted.
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".
Measuring cycles
Programming Manual, 03/2009 Edition, 6FC5398-4BP10-2BA0
Measuring Cycles for Turning Machines
6.5 CYCLE974 workpiece: 1-point measurement
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