Siemens SINUMERIK 840D sl Programming Manual page 356

Measuring Cycles for Turning Machines
6.6 CYCLE994 workpiece: 2-point measurement
Prerequisite
The probe must be calibrated in the measuring direction (if _CHBIT[7] = 0) and called as a
tool with tool offset. The tool type is 5xy. The cutting edge position can be 5 to 8 and must be
suitable for the measurement task. The measuring cycle can be used for measurement
without previous calibration.
Instead of the trigger values in _WP[ ], the probe ball diameter entered in the probe array
_PRNUM (_WP[_PRNUM-1,0]) is used in the calculation.
The function is controlled via bit:
• _CHBIT[7]=1: Probe not calibrated, (without use of the trigger values), use of the probe
• _CHBIT[7]=0: Probe is calibrated, use of trigger values in
Tool offset
An offset can be applied for the tool that machined the workpiece. This tool is specified in
_TNUM and _TNAME. The D number and type of offset are specified in coded form in
variable _KNUM.
From measuring cycles SW 6.3, extended tool offset is available. With this function a tool
from a particular stored tool environment _TENV, and additive, setup offsets can be
corrected by specifying the DL number in _DLNUM.
Detailed information on the parameters: see 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 Section "Description of the most important defining
parameters").
6-80
ball diameter _WP[_PRNUM-1,0])
_WP[_PRNUM-1,...])
Programming Manual, Release 04/2006, 6FC5398-4BP10-0BA0
Measuring cycles